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2004 silverado 2500: heats..our 5th wheel..water pump went..fine till

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I have a 2004 Silverado...
I have a 2004 Silverado 2500HD diesel that over heats whenever we tow our 5th wheel up hill. It started when the water pump went after we headed west out of Denver. It was fine till we started going up hill near Price Utah and had to be towed. They have tried 2 sets of therermostats, 2 coolant flushes, replaced the water pump which was leaking and a new fan clutch. Now it runs hot even when I'm not towing. Also when it over heated it was down 2 gallons but did not see antifreeze on ground or in the oil. Any suggestions?


XXXXX XXXXX
Fla
Submitted: 7 years ago.Category: Car
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Answered in 3 minutes by:
8/1/2010
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago
GM Tech (Cam)
GM Tech (Cam), Auto Service Tech
Category: Car
Satisfied Customers: 29,691
Experience: GM Grand Master Technician 2007. 14 years experience.
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GM Tech (Cam) :

I will do my best to assist you. When you are finished please click on accept only if you are satisified. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can.

GM Tech (Cam) :

What is the 8th digit of your VIN?

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Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago
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If you are still working with your Expert on this question, you can post additional replies and receive additional information on this page.  If you received a satisfactory answer in Chat, you can accept the chat conversation above.
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Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

What is the 8th digit of the VIN please.

 

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Customer reply replied 7 years ago
The 8th digit on the vehicle's VIN is 2
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

Ok, does it fully overheat or does it push more coolant out than anything?

 

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Customer reply replied 7 years ago
It fully over-heats. Bells ring and the insturment panel flashes "engine overheat"
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

Ok, Does the engine coolant pressurize very quickly?

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Customer reply replied 7 years ago

Don't know. do you want me to go start the truck and time it?

Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago
Yes, please start it and see if the rad hose gets hard quickly. If not, rev the engine a few times and see if that does.
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Customer reply replied 7 years ago
Let the engine run about 10 minutes and the temp only went up to 180 and the hoses never did feel hot or hard. Reved it up and held at 1800 rpm no change.
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

OK, is the check engine light on?

 

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Customer reply replied 7 years ago
No.
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

Ok, I suspect that there is either some debris between the rad and the charge air cooler or the head gaskets are leaking.

 

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Customer reply replied 7 years ago
Will compression test reveal either or both of these possibilities?
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

Usually not. THe compression or even the block test usually do not. However if it always pushes the coolant out of the tank and hose, and you have changed the thermostats and pump, then that is all that is left.

 

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Customer reply replied 7 years ago

There is a GM Service Bulletin dated August 2006 that I think refers to this question. Bulletin # XXXXX XXXXX Do you have an opinion on this as a possible resolution to the problem we are encountering?

 

The truck goes back to the shop tomorrow. Anything (other than the previous conversation) we should ask/share with the technician?

Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

IF it was only towing, then maybe, but since it overheats without towing I would say no. Possible that it was the cause and the overheating caused head gasket issues.

 

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Customer reply replied 7 years ago
thanks for your insight and expertise..
Auto Mechanic: GM Tech (Cam), Auto Service Tech replied 7 years ago

My pleasure. You can reply at any time for follow up information regarding this issue, even after you accept my answer and I will reply.

 

 

 

Thanks for using Just Answer. If you want me to answer your next GM or GM product question, please put "For GMTECH Cam to Answer" and I should get it. Thanks and have a great day!!

 

GM Tech (Cam)
GM Tech (Cam), Auto Service Tech
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Experience: GM Grand Master Technician 2007. 14 years experience.
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