I have a 2003 4.7 D that I bought about two months ago. I love the truck but it intermittently starts to heat up to the red line. It does not stay there and usually goes back to normal when moving at high speeds. I took it back to the dealer twice. The first time it would not duplicate the problem the last time they through in a new t-stat. that seemed to work fine for about 2 weeks and then it did it again for about two days and stopped. It has not occurred in 4 days now. Any ideas on what the problem may be.

 

Addtionaly the coolant is evaporating or leaking because the levels are lower than they should be whe it gets into the dealer.

 

4.7s require a special process to "burb" the coolant system. Simply topping off the radiator doesn't cut it. My guess is, you have air pockets trapped and the burbing needs to be done. If you are talking it to the dealer, tell then that. If they don't know how to do it up front, they can look it up and in the end will agree.

Your coolant levels are low due to the air taking up space where coolant whould be. It's all related.

IndyDurango

 

Thanks. Is this a reletivly easy process that I can do myself?

 

If you have the process, yes. Search burb 4.7 and you should find it.

IndyD