I have been having overheating problems on and off for months now. Now after a ton of thermastats, i had it checked twice and i took it to a radiator shop. They couldnt even figure out the prob. Its not the radiator, thermastat, they did a head check. I dont know. SO today i hit the interstate and overheated. I waited a half hour put water in, and drove 2 more miles overheated again. So i just let it cool and pulled out the ait sensor and its been running fine. Not even getting hot. What could this be

 

I would personally see about getting a cable and something like Freescan to see what's going on with the sensors etc. Perhaps your coolant temp sensor is bad and the fans are not coming on??? Have you checked the fans? Did the radiator shop actually check the radiator out of the car?

 

as of now ive kept the ait sensor out, and i havent overheated but the radiator shop, or the GM dealership neither had seen anything like it

 

FYI - if you still have functional A/C, both fans should go on HIGH if the A/C is set to full cold / recirc mode. That's an easy way to check functionallity.

 

I've never heard of the IAT sensor effecting cooling system performance.

 

I wouldnt think the coolant temp sensor bc i ran my car for months without a coolant temp sensor and the only problem i had was running rich and hard to start.

 

You're probably right cuz mine had the same symptoms but he didn't really have anything for us to chew on so I was just throwing that out there. To the OP, have you checked the fans at all?

 

Do you have the Air damn attached and it isn't bent? It's obvious but I've seen it happen.

Also, exactly how hot is the car getting? Did it go into red?

 

+1 to the air dam. also, check around the radiator for leaves or gunk or any **** in the way of air flow.

does it only overheat when you are doing high speeds? or when its sitting idling?

 

how big of a difference can the air dam make. Its been knocked oof, but i wouldnt think it would make such a huge difference out of nowhere

 

uh yes. that provides airflow to your radiator and intake (if its stock) at cruising speeds (45mph+)

if you do not have it, you WILL over heat at highway speeds

 

Im having the same problems too. Ive got a 94 and just installed a fan switch. Have yet to see if that solves it.

How many pieces are there to the "air dam" ? I have two pieces of plastic on the left and right side in a triangle shape. Nothing in the middle though.

Hey , also I read in the good ole' Hanes book that a bad radiator cap might cause insufficeint pressure in the cooling system which would lower the boiling point of the fluid. How many votes do I have to spend a few dollars on a new cap???

 

WOW! Guys!!! THE COMPUTER TURNS ON THE FANS AT A CERTAIN TEMPATURE!!

There is two coolant sensors. One on the side of the head. And one on the front of the
water pump. One is for the gauge and one is for the PCM. Have you even checked to
see if your fans are operating? Turn on your a/c and they should both kick on.

OR... simple check... jump your relay (or fan switch) and force both fans to run... make sure your coolant is topped off as well as the overflow and AIR OUT OF THE SYSTEM. Take it for a drive with both fans blasting and all these other requirments met...

Come back and let me know the results.

PS. not having the lil air damn is a very very dumb idea.

 

The OP seems to be avoiding the fan questions.

 

i run mine with no air damn and dont have any problems but mine is a third gen with a LT1 and I plan on putting mine back on.

 

what is the point in taking it off? There is none.

 

they checked the fans, and i always notice them coming on anyway

 

Maybe something going wrong with the water pump? Maybe something on the cam, or just a bad pump.

 

One fan or both? Did the radiator shop actually take the radiator out to look at it? What kinda mix are you running for coolant?

 

If your going to be a smart-***, at least learn how to spell right. Its "temperature", not "tempature".