Allright I can't figure it out.....all of a sudden one day my car just started over heating....had the coolant changed....didn't help...at 50K mantainence decided to change the pump as precuationairy mode...done...installed 160 degree...done...okay..now when I drive it's like it stays really cool then jumps up to the halfway mark...then it gets eally cool again...then it jumps up to the hot mark and stays there ....??? it does this durrung regulair and stop and go driving...wierd? is it my sensor? I knwo my radiator needs to be cleaned...but that dirts been in there when it was fine...so what might it be?

 

Sounds like maybe air in the system.Ever flush it?

 

Sevral times

 

Air in the system or bad temperature sensor in the drivers' head. $7 sensor, just go buy a new one.

 

Ever bleed the system?

 

Jesus heatmaker, 760 post's in 2 months! what do you do all day?

 

Lol...yeah I have no Idea why I have 760 post...guess I just like this site...lotsa good info....


but any how...since The cooling system has been bleed 3 times...once by GM with the tech 2 scanner at hand...again at the Auto shoppe...and then again by me(x3)... after I did the pump... The heat issues have still been the same...so I"m going to assume the sensor is lame. Where is this temperature sensor located? Prehaps I knocked a whire or something loose...I've been doing allot of stuff under the hood so I wouldn't be surprised...just annoyed I can't get my temp down...one second ishe's freezing then she's boiling...then she's cool again.

Thinking about investing on a 180 Jet fan kit next...

but where is the temp sensor again?

 

Tippy

 

Spinner told you the temo sensor was in the drivers side head, its between the #1 and #3 exhaust ports

 

Between #1 and #3 ports...okay...lemme take a looksee...How much does the replacement hting run? Is it 7bucks really? I know that's not a GM price.

 

If you are going to go the sensor route, you will need to change the ECT in the water pump, not in the head. The thermistor in the head controls the guage reading but does not feed information to the PCM. The thermistor in the water pump feeds info to the PCM and then the PCM uses that info to activate the fans.