Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

This answer was rated:

How can I tell if my fan clutch is working right on a mack…

How can I tell...

How can I tell if my fan clutch is working right on a mack mp8 engine 2009

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

Mack chu613 2009 MP 8 engine

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

No

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Truck heats up pulling hills loaded heavy - coolant level is full

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.

When

Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 32 minutes by:
1/16/2017
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
Experience: Shop Froeman for Freightliner Trucks
Verified

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

can you give specifics on the operation of the fan now???

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
it turns when idling I'm not sure its engaging when pullng hills loaded heavy
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

ok, does the truck run hot???

when the engine gets to temp, about 195-200 degrees the fan should come on and cool it down. at idle it will come on but should turn off when the temp goes down.

as far as on a load, does the temp get too high???

if the ac is on, it will stay on all the time

Roy

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
ac not on I'm afraid when it heats up past 200 it will shut the truck offits 20 degrees hereis there a sensor I should check
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

the ecm reads temp off the coolant sensor.

also, I would make sure the thermostats are working. I would change them as well.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
it runs normal temp with 20,000lb load I don't think its a thermostat I think its electricalI was told the water pumps on these mp8 engines last for ever is this true
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

no, no water pumps last forever.

I doubt it is electrical. if it was, it would not work at idle as you said. it is a control issue whether the thermostats are not opening all the way under load or the coolant sensor is not sending the correct signal but I doubt that it is the sensor. it would do it all the time, even at idle.

the last possibility is a possible head gasket issue. it may be leaking slightly just enough to super heat the coolant

Roy

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
no coolant in the oil
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

does not have to show. it can be evaporated on a slight leak and not show up in the oil until it gets worse

Roy

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
what do you suggest I do
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

start with having the thermostats checked.

make sure the coolant sensor is sending correct signal. you need the tech program for that

have a leak down test done for checking the head gasket.

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 5 years ago
Ok Thank you I cant go to Mack dealer I haven't hit the lottery yet
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

your welcome

Please dont forget to rate me as it is the only way I get paid for my efforts. we are subcontractors for the site and get a small portion of what the site charges you. you can hit the accept button at the top of the page or 5 stars.

Roy

roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
Experience: Shop Froeman for Freightliner Trucks
Verified
roybelding and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Technician: roybelding, Shop Foreman Freightliner trucks replied 5 years ago

thank you

Ask Your Own Medium and Heavy Trucks Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask roybelding Your Own Question
roybelding
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
12,915 Satisfied Customers
Experience: Shop Froeman for Freightliner Trucks

roybelding is online now

Related Medium and Heavy Trucks Questions
I have a 2009 Mp8 it has white smoke coming out the pipe
I have a 2009 Mp8 it has white smoke coming out the pipe also raw diesel coming out of a crake on the exhaust manifold with the valve cover off I unplugged 1 2 and 3 injectors no change to the engine … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
On a 2012 mack mp8 engine can u tell me exactly where this
on a 2012 mack mp8 engine can u tell me exactly where this fuel check vavle is on the front of the head ,if its on driver or passenger side… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I diagnosed Mack mp8 year 2014, the fault code is P20EE FMI
i diagnosed Mack mp8 year 2014, the fault code is P20EE FMI 00 AND P103C FMI OCCURED .what is the possible cause of these codes how to proper diagnose, how to read temp and diff pressure sensor readin… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have a 2015 Mack chu613 with MP8 motor, at times engine
I have a 2015 Mack chu613 with MP8 motor, at times engine will crank but not turnover. I was driving down the road and lost power, my RPM no higher than 1200 and dropped from there, engine shutdown, w… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have a 2009 mack chu613 with an mp8 engine. The unit shut
I have a 2009 mack chu613 with an mp8 engine. The unit shut off and won't fire. It was cranking previously, but now it wont even crank. Please advise… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 2013 Mack CHU613 with the MP8 engine. 2013 Mack
-SPN 1072 FMI 4 -SPN 1127 FMI 18 -SPN 647 FMI 5 -SPN 4811 FMI 2 -SPN 4813 FMI 4 -SPN 1265 FMI 4 -SPN 3936 FMI 0 -SPN 1127 FMI 10 -SPN 1127 FMI 14 -SPN 411 FMI 7… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2012 Mack mp8, fuel filter base/housing has a manual pump to
2012 Mack mp8, fuel filter base/housing has a manual pump to fill filters manually, that manual pump will not stay in … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I had a fan belt break on my 2008 Mack CHU613 Pinnacle and
I had a fan belt break on my 2008 Mack CHU613 Pinnacle and the connected for the fan side control clutch ripped off. I need to know how to rewire without buying the entire assembly. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
My 2015 Mack won't turn over. I have dash lights but starter
my 2015 Mack won't turn over. I have dash lights but starter won't engage. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have a 12 cxu613 mp8 engine All of a sudden today started
I have a 12 cxu613 mp8 engine All of a sudden today started missing really bad and started running WArM . pulled over let cool off full of water, fan working, starts back, cant go 2 miles before temp … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
2013 Mack chu613 MP8 415c deleted. last part of my vin #
2013 Mack chu613 MP8 415c deleted. last part of my vin # DM011873. runs hot pulling. runs cool not pulling. bottom of radiator hotter than the top. I have put on a new water pump, all hoses, belts, fa… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
What is the part number for a Mack MP-8 camshaft timing kit.
What is the part number for a Mack MP-8 camshaft timing kit … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
When truck is pulling a heavy load at 1000 to 1200 rpm it
When truck is pulling a heavy load at 1000 to 1200 rpm it shakes and vibrates until it gets above 1400 rpm. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Assist malfunction. 2011 chu613 mack mp8. Not sure what
not sure what happened,brakes locked tried to move forward and lost all air … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Just wondering how often to adjust valves on MP8. Mack
Hi just wondering how often to adjust valves on MP8 … read more
roybelding
roybelding
Shop Foreman Freightliner trucks
12,915 satisfied customers
I have an engine code on a mack with an mp8 engine spn 1127
hello i have an engine code on a mack with an mp8 engine spn 1127 fmi 14 and spn 1127 fmi 18 … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have a 2010 Mack with a MP8 engine. I was wanting to know
I have a 2010 Mack with a MP8 engine. I was wanting to know if a turbo charger super charger from a 2013 Mack MP8 engine would work on the later model engine ?… read more
Kent Van Wagner
Kent Van Wagner
40 satisfied customers
My Mack mp8 is losing power under load turbo seem to be
Hi My Mack mp8 is losing power under load turbo seem to be showing boost no active codes but has inactive codes mid128 Psid44 fim14 and mid128 psid45 fim14 and they will not clear … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 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.

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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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