yesterday after class i was driving home about 12 miles i was 2 miles away and my heat started climbing pretty quick turned the heater on and it went normal.
this morning for work after about 8 miles the heat started climbing again i turned on the heater again it went down to normal then the way home it ran fine its an 04 78k and it has a clean title i searched and it sounds like i need to bleed it but i dont know the process to do it i know where the valve is but i havent found a solid explanation of how to do it. if theres anything else to check let me know help me out here guys

 

Checked your fluid level?

Bleed process can be found at the bottom of this page..

http://crackaddict.com/~flynn/howtos...amco.howto.htm

 

Turn your AC on full blast & make sure both Fans are spinning behind the radiator. I just had my fans replaced.

 

Same thing happend to me last week the fan would work off and on then finally gave out and replaced it yesterday.check your fans like stated above

 

fans are working fine and the overflow was a tad low i just drove it about 15 miles and still ran fine and i was driving it a little hard any ideas on why it only happened yesterday and this morning?

 

it could be any number of things

first thing to do is flush the coolant out, replace it with fresh stuff and follow the bleed procedure specified in the factory service manual. From there, keep your eyes on things

 

if it happens again that'll be the first thing i do i dont know what the heck it was cuz it just stopped overheating is there any instructions on bleeding it cuz i couldnt find anything

 

Factory service manual

 

i dont got one

 

read post two. definitely check if the fans go on when they're warmed up and when the a/c is on. also, check if there's any oil in the coolant overflow tank.

 

the fans work fine oil in the coolant leaves a thick kind of substance right?

 

so my overheating issue is arising again i can tell when its about to my fans are both going and wont stop then after a few minutes my temp needle creeps up then flys up to 3/4 up i turn the heater on it goes back within 5 seconds but when i slow down the needle creeps up to a little over half then goes down after i start going again any ideas?

 

Thermostat is bad

 

It's not your thermostat since your heater system is working. It may be a blown head gasket, since you say your fans do work. Take it to a shop and have them perform a leak down test, this will let you know if you have blown head gaskets.

 

i have a similar problem but mine only over heats when its at a light or parked with the ac running, my left fan (drivers side) it comes on sometimes and i tried replacing it and it didnt change anything. Any one have any ideas?

 

Change your thermostat. My Saab (daily driver) did the same thing.....changed the thermostat and everything went back to normal.

 

I had overheating problem just last week. I temperature gage would climb to 3/4 within 15-20 minutes after engine is turned on. I had the thermostat replaced and everything is all good now