Any opinions on what to do first? Im thinking flush coolant system and new t-stat. Anybody else had this problem on the highway only? Around town it fine, it only does it when im on the highway at or above 3k in fifth for a while. Ill have to blast the heat and slow down for a while. Any help appreciated.

 

the coolant flush is a good idea, usally with the symptom you are having its the radiator not working . like if its clogged up inside and/or the cooling fins are blocked off with dirt or something to that effect.

 

could be the thermostat

 

check to see if your fans turn on after the cars warmed up

 

whats a fan got to with highway driving????? The fan is there to pull in air when the car is NOT in motion. check the t-stat.

 

He didn't say, check the fans on the hi-way .... he said after the car is warm.

It could be a sticking thermostat as well .... flush the system, see if that helps. If it doesn't, then I'd look at the thermostat / water pump. If it turns out to be the water pump at all .... do the TC tensioner while you are at it.

 

thanks for the info guys. oh man, I hope its not the pump.... The fans are running, but im pretty sure even if they werent in the car it wouldnt overheat on the highway. could I get away with just flushing the radiator? Im going to do the flush and thermostat same time i guess. any other suggestions/advice is welcome...................

 

only other thing I can think of is to inspect the cooling fins and make sure the are not clogged up. I have seen everything from mud,to bugs block airflow through the radiator...of course there is a condensor in front of it...hmmm...so check that too.

 

uhm wat bout the other way around. wat if the car runs great on the highway.. 80 miles each way but as soon as u get off it overheats? and the fans are running? not mine. mines running great *knock on wood* but a co worker has a 97 gle ands too lazy to sign up for the org.

 

^^^

If they are too lazy, they get no help! Silence to the non-.org'rs ....

No really .... I'd say thermostat on that one mate.

 

UPDATE: i did the coolant flush and changed the t-stat. the car is real happy crising at 70 now.... thanks for the help org!!!