Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

Chevrolet Silverado: I have a 2013 Chevy 3500 srw with a Duramax.

Customer Question
I have a 2013 Chevy...
I have a 2013 Chevy 3500 srw with a Duramax. Yesterday I had a message to turn off my A/C and at that point discovered it was running hotter than normal. I pulled over and raised the hood. The fan didn't appear to be running very fast. I stopped by a parts store and bought a new rely, but that didn't change anything. Out on the highway it cooled off some as long as I didn't run the A/C.
Can you tell me if it's my fan clutch or some sensor? The fan clutch seems pretty tight, no real wobble in it. The check engine light came on last night as I pulled into the driveway, but the motor was not overheating. Please let me know. I have a friend of mine with a computer who was planning on hooking it up this evening. I don't know how to test the fan clutch either. Thank you for your time.
Submitted: 1 year ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 9 minutes by:
5/9/2016
Chevy Mechanic: Pete, Auto Service Technician replied 1 year ago
Pete
Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 29,599
Experience: 14 years GM dealer Technician.
Verified
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay. If your model uses a fan clutch and does not have the electronic fan as some have below is the procedure on how to test this clutch assembly.I have had to replace the fan clutch on this model here before due to this issue and the check engine light coming on is most likely a fault code set for the EV fan clutch failure needing replaced. Circuit/System Description The ECM controls the EV fan clutch operation. The ECM regulates a 12-volt pulse width modulated signal (PWM) to the cooling fan relay. The PWM signal determines the ON time of the relay. As the ECM command increases, so does the ON time of the relay. The relay ON time directly controls the amount of time the solenoid, which is internal to the fan clutch, is energized. When the solenoid in the fan clutch is energized, it opens the spring loaded valve and allows fluid to flow from the storage chamber to the fluid coupling of the cooling fan clutch, which increases the fan speed. When the solenoid is de-energized, the spring loaded valve closes, and allows the fluid in the coupling of the fan clutch to drain back to the storage chamber, which reduces fan speed. The rapid modulation of the fan clutch solenoid valve gives the ECM the ability to precisely control the amount of fluid that remains in the fluid coupler, allowing more effective regulation of the fan speed and powertrain cooling requirements. Circuit/System Verification 1. Ignition OFF. 2. Verify the conditions listed below do not exist with the cooling fan system: * A loose, worn, or mis-routed drive belt* Oil leaks at the cooling fan clutch * A free-spinning cooling fan * A seized cooling fan clutch * A broken cooling fan * Inspect the cooling fan clutch harness connector and the fan clutch jumper harness for the conditions listed below: - Poorly mated connectors - Backed/pushed out connector terminals - Poor terminal tension - Cut, chaffed, or nicked harness wiring at the fan clutch ◊If a condition is found Repair as necessary ◊If a condition is not found 3. Ignition ON. 4. Verify DTC P0480, P0483, P0495, or P0526 is not set. ◊If a DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) List - Vehicle ◊If a DTC is not set 5. Engine at operating temperature. 6. Verify the scan tool Fan Speed and Desired Fan Speed parameters are within 500 RPM while performing the test listed below: 1. Increase engine speed to 1,500 RPM Note: In each of the commanded states, it may take up to 2 minutes for the Fan Speed to achieve the Desired Fan Speed. 2. Command the Cooling Fan slowly from 10 % to 80 % with a scan tool. 3. Command the Cooling Fan to 10 % with a scan tool. ◊The Fan Speed is not within 500 RPM of the Desired Fan Speed Refer to Circuit/System Testing ◊The Fan Speed is within 500 RPM of the Desired Fan Speed 7. All OK Circuit/System Testing 1. Ignition OFF, and all vehicle systems OFF, disconnect the cooling fan relay. It may take up to 2 minutes for all vehicle systems to power down. 2. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. ◊If the test lamp does not illuminate 1. Remove the Fan Fuse. 2. Test for less than 2 ohms in the B+ circuit end to end. ◊If 2 ohms or greater, repair the open/high resistance in the circuit. ◊If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. ◊If the test lamp illuminates 3. Test for less than 5 ohms between the fan relay ground circuit terminal 6 and ground. ◊If 5 ohms or greater 1. Test for less than 2 ohms in the ground circuit end to end. ◊If 2 ohms or greater, repair the open/high resistance in the circuit. ◊If less than 2 ohms, repair the open/high resistance in the ground connection. ◊If less than 5 ohms 4. Test for 7-17 ohms between fan relay terminal 4 and terminal 6. ◊If less than 7 ohms 1. Disconnect the engine cooling fan harness connector. 2. Verify a test lamp does not illuminate between the fan relay terminal 4 and B+. ◊If the test lamp illuminates, repair the short to ground in the solenoid valve control circuit terminal 4. ◊If the test lamp does not illuminate, test the circuits of the jumper harness for a shorted condition. If the jumper harness tests normal, replace the cooling fan clutch assembly. ◊If greater than 17 ohms 1. Disconnect the engine cooling fan harness connector. 2. Test for less than 2 ohms between relay terminal 4 and fan harness connector terminal B. ◊If 2 ohms or greater, repair the open/high resistance in the fan clutch solenoid valve control circuit. ◊If less than 2 ohms. 3. Test for less than 2 ohms between the fan harness connector terminal A and ground. ◊If 2 ohms or greater, repair the open/high resistance in the circuit. ◊If less than 2 ohms, test the circuits of the jumper harness for an open/high resistance condition. If the jumper harness tests normal, replace the cooling fan clutch assembly. ◊If within 7-17 ohms 5. Engine operating, connect a 10 A fused jumper wire between fan relay terminal 4 and B+. Note: It may take several minutes for the fan clutch to fully engage with the engine at idle. 6. Verify the fan gets much louder to indicate the fan clutch is engaged. Note: It may take anywhere from 10-52 minutes for the fan clutch to disengage depending on the factors below: * Engine speed * Coupler fluid temperature * Elevation above sea level 7. Disconnect the 10 A fused jumper wire from B+. The fan should become quiet to indicate the clutch is disengaged. ◊If the fan clutch doesn't engage or disengage according to the test Replace the cooling fan clutch assembly. ◊If the fan clutch engages and disengages according to the test 8. Test or replace the fan relay. Component Testing Relay Test 1. Remove the cooling fan clutch relay. 2. Connect a 10 A fused jumper wire between relay terminal 2 and B+. Connect a jumper wire between relay terminal 6 and ground. 3. Test for less than 1 V between terminal 4 and ground. ◊If greater than the specified value, replace the fan relay. 4. Connect a jumper wire between terminal 5 and ground. 5. Test for B+ between terminal 4 and ground. ◊If less than the specified value, replace the fan relay. If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete
Ask Your Own Chevy Question
Customer reply replied 1 year ago
Thank you, ***** ***** check all of this out. I can say that with the engine off and the key off the fan turns freely. Is that supposed to be that way?
Chevy Mechanic: Pete, Auto Service Technician replied 1 year ago
Your welcomeYes as the EV clutch is then released so it will turn freely like this here.I suspect the clutch needs replaced as it is the most common to fail. Let me know if you need anything else and feel free to rate my help here. Thanks Pete
Ask Your Own Chevy Question
Ask Pete Your Own Question
Pete
Pete
Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 29,599
29,599 Satisfied Customers
Experience: 14 years GM dealer Technician.

Pete is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,249 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,196 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,847 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,900 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,682 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
When I start the engine, the power steering automatically
when I start the engine, the power steering automatically forces the wheels all the way to the left. They are then locked there and I can't move them. … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,900 satisfied customers
Check engine light is on... It spudders at an idel. And
Check engine light is on... It spudders at an idel. And sometimes doesnt start .. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No power to fuel injectors when engine cranks. Fuel
no power to fuel injectors when engine cranks. Fuel injectors are brand new. rtruck runs when gas is poured into carborater. 1989 gmc suburban 350 motor … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2002 Chevy Blazer with 4.3 engine. Frequently will not start
2002 Chevy Blazer with 4.3 engine. Frequently will not start after setting overnight. Dribble a little gas in the intake and it fires up and runs fine. May or may not start after sitting a few hours. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Engine is so hot burns plug wires Engine gets so hot outside
engine is so hot burns plug wires Engine gets so hot outside until it burns plug wires … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,938 satisfied customers
86 K10 temp. gauge goes to hot and engine dies, but engine
86 K10 temp. gauge goes to hot and engine dies, but engine is still cool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1996 chevy Silverado k2500 5.7 vortec engine engine light on
1996 chevy Silverado k2500 5.7 vortec engine engine light on po300 random misfire detected we replaced plugs wires Distributor cap and rotor pickup coil checked compression everything is good there ch… read more
Michael Solis
Michael Solis
259 satisfied customers
It will not start the engine will turn fine but will not
It will not start the engine will turn fine but will not start i replaced the fuel pump but it made no difference i also tried changing the fuel pump relay but that did nothing … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Wash engine but do not start engine. Its ok. Everything is
wash engine but do not start engine JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: Yes its ok JA: What is the model/year of your Chevy? Customer:… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
I got a crate engine 10066038 in back of the engine i says
i got a crate engine 10066038 in back of the engine i says im0918 6vp can you tell me more about this engine? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My car won't start it says engine power reduced, engine
Hello my car won't start it says engine power reduced, engine disabled, and service esc … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Have a 2009 HHR, 2.4 L engine. Check engine light came on,
Have a 2009 HHR, 2.4 L engine. Check engine light came on, had scanned at AutoZone. Code P0010, with definition: intake camshaft position actuator solenoid, control circuit bank 1. Explanation:ECM has… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Check engine light, reduced engine power, service power
check engine light, reduced engine power, service power steering mesaages … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Now I have a P0300 check engine light code. Swapped out coil packs. Drive down the road perfectly. What do I do next?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
My 2006 sierra 3500 8.1 litre engine all of a sudden engine
My 2006 sierra 3500 8.1 litre engine all of a sudden engine light came on and would not go over 20 mph. Then turn off and run good till it warms up … read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Pete
Pete
Auto Service Technician
29,599 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x