Engine/Transmission (1994 - 1998) Truck Running Warm

[DAZ]

I took a trip with RV in tow and with the A/C on the temps got to about 210. I have never seen them higher then 190 so I was wondering what you all have seen. My truck is a 97 with 130,000 and the thermostat is original. I will change it this week just wanted to know what you all have seen. Thanks

 

[RHARVEY]

Have you checked the fan clutch???? I have replaced mine once in the 205000 miles.

I have seen 210* on mine even with the new fan clutch. I only see that temp when I am pulling Questa grade just north of SLO, Ca. Its a 6% grade for about 3 miles or so. Our 5er tips the scales right at 10k.

What are you EGT's running when the temps get that hot??? Mine are sitting around 1100* and 30lbs of boost@ 55-57mph. .



What part of the country are you from???



Rick

 

[DAZ]

Rick,



The fan clutch seams OK. The boost is around 24 and the EGT's are about 1100 to 1200. It warms up and then cools right back down if I do not have the AC on. I did get a new thermostat yesterday so I will try that first. The only problem is I do not know when I will get the trailer back out so I don't know if this will fix the problem or not. Thanks

 

[Steve Campbell]

At 130,000 miles.....

is your radiator partially plugged with bugs?

 

[Bseg]

My coolant has gotten that high before with no load climbing Old Priest Grade on the way to Yosemite. The last trip I made there a couple of months ago we only had camping gear, my wife, two kids and our 90 lb Lab with us and the truck was crawling at about 15mph up the grade with the air off and I had to turn on the heater to help cool it. The EGT's reached 1000 but that was with my probe located in the EGR block off plate. Moved the probe since then and I believe that they may have been more like 11-1200 during that climb.



That is the steepest grade I have ever gone up and both times it's gotten to the point that I thought it would overheat. The clutch fan was definitely doing it's thing, sounded like a helicopter.



After that pull it always cools back down and is fine.



My thermostat went out around 50k miles and it was real obvious cause the temp gauge was going real high at 55mph which it never really does. I didn't have the normal cycling that I usually see.



Bottom line is, drive the truck without a load and see how your temps look. If it still goes real high I try a new thermostat and then see what it does.

Put in a new thermostat and it's been fine since.