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I have a 1995 Chevy truck K1500 4x4 4.3L. The temp guage

Customer Question
I have a 1995 Chevy...
I have a 1995 Chevy truck K1500 4x4 4.3L . The temp guage heats up to 150 degrees and won't go any higher. I have changed the Thermostat, Temp sending unit, and grounded guage to make sure it was working. Nothing has repaired the low temp. Help !!!!
JA: Have you checked the coolant level? Has there been any leaking from the hoses?
Customer: Yes the coolant level is good, I repaired the heater hose quick connect in the intake manifold , it was leaking.
JA: What is the model of your '95 Chevy?
Customer: Cheyenne
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: I have changed the thermostat, Temp sending unit, and grounded cluster guage to make sure it was working
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 year ago.Category: Chevy
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Answered in 3 minutes by:
11/3/2016
Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,128
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
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Hello, if you unplug the coolant sensor does the gauge fall to cold or go to hot?

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Customer reply replied 1 year ago

when I unplug the coolant sending unit the gauge falls to cold

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

Thanks, ***** ***** no short in the wiring. Now if you would blace a piece of wire or paper clip in the connector part and ground it. The gauge should swing full hot, let me know what you find.

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Customer reply replied 1 year ago

I already did that and the gauge pegged all the way hot.

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

Alright that means cluster and wiring are good. I see you also replaced the sensor.

Another thing that can make it run cool is the fan clutch staying engaged. Do you hear the roar of the fan all the time when driving?

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Customer reply replied 1 year ago

I can't answer that for sure, should I go start it up and see ?

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

Yes, when you first start it the clutch should stay engaged for around 3-5 minutes and then the roaring should stop. If it doesn't the clutch is bad.

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Customer reply replied 1 year ago

Ok I will start it up and see what happens. hold tight and I will let you know.

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

Sounds good

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Customer reply replied 1 year ago

It appears that the clutch fan shut down after about 4 minutes. The coolant hoses are very hot to the touch and I have good heat in the cabin via the heater.

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

Alright, one last test to make sure they gave you the proper sending unit. This works best if you have a small saucepan and a candy thermometor for it. You'll need an ohm meter

Temperature Gauge: Testing and Inspection
Gauge Reads Low
1. Ensure terminals are clean and connections are tight.
2. Remove lead at sensor, measure resistance using an ohmmeter.
3. At 104 degrees F resistance should be approximately 1200-1350 ohms, and at 125 degrees F resistance should be approximately 53-55 ohms.
4. If resistance is not within specifications, replace sensor.

The GM part number for the right sending unit is 25037332

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Customer reply replied 1 year ago

I already done this check after installing the sensor and temp was the same . We tested at aprox. 120 degrees and the ohms resistance was about 1200. It doesn't appear you can help me . I thought maybe you knew something that I was missing.

Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago

It should be around 50-55 at 120. I'll open this up to other experts to see if anyone else has any thoughts on this. Someone should be with you shortly.

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Customer reply replied 1 year ago

The PN# ***** replaced with was ACDELCO 25037332 which is the correct one.

Customer reply replied 1 year ago

It is approaching an hour since our last chat. Is anybody helping me on my problem ?

Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,167
Experience: Have owned a repair shop for 25 yrs.
Verified

Hi, My name is ***** ***** for the delay.

I will do my best to assist you.

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

lets try this again..

does the heater get hot as it should?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

does the truck run well?

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Customer reply replied 1 year ago

Hi Tim, I hope you can help me. The heater gets hot as it should and the truck runs very well with 104,194 miles on it.

Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

ok..enlighten me here..

what is the problem?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

is there some reason you need it to run hotter?

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Customer reply replied 1 year ago

Tim , this was my wife's father's truck and he has passed on. My wife loves driving this truck and I want to make sure it is safe for her to drive. If for some reason the truck would start to overheat , while she was driving she would never know acording to the gauge. We put a thermo on the coolant and it was reading 200 degrees when fully running.

Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

where did you get the 200deg reading?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

what part of the engine?

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 1 year ago

sorry for the delay,i had internet trouble

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