I have a 98.5 Cummins 2500. This weekend I towed my camper about an hour away. The temp guage went to Red(240) for a few minutes after towing and then would return to around 210. It did this several times. The truck never gets hot under normal conditions, just when towing. I was told it could be the fan clutch but it seems tight too. Any other suggestions before I just start buying parts? I've changed the thermostat with a new 190 also. Just wondering if it could be some sort of sensor.

Any help will be appreciated.

Thanks
Chris

 

cleaned the front of your pickup of bugs and junk inside the radiator?

 

Wash the rad fins out with water. You'll be surprised at how much dirt can collect in there.

 

I cleaned the radiator with a pressure washer and also flushed and changed radiator fluid when I replaced the thermostat. Any other suggestions?

Thanks

 

Do you have good coolant flow? Pull the rad cap when its hot and see. If it's flowing good, then your looking at a fan clutch. If the flow is weak then its gonna be a waterpump.

 

I'll check that,

Thanks

 

you might also need to look at having your radiator rodded. . .I cannot remember where I saw this but the 2nd gens had a bad rap with radiators clogging if the wrong fluid was used.

 

Who may do the radiator rodding, Also I used the Red "DEXCOOL" fluid when I replaced it. That's what was in it. What coolant do all of you use?

Thanks

 

I think 2nd gens have to use a HOAT style coolant. . .and any local radiator shop can do that for pretty inexpensive.

 

Drew, I just thought about something else. When I turn my heat on it blows pretty warm when it's on about the second blower level but if I turn it wide open it blows cooler, not coldair. Does this sound like a radiator problem too. The heat never really gets real hot like my other cars do. Also can you explain what rodding the radiator means.

Thanks
Chris