Temp Gauge

[Tech_n]

I have a 97 Grand Prix GT with 154,000 miles on it

When I am sitting at a light for a long time the temperature gauge start to move up close to the needle before the red and then when I start driving the car it stays under 210.

I am trying to figure out why this happens because I flushed the radiator system and changed the therm with a delco therm and the problem is still occurring, can somebody please help me out?

[BNaylor]

Originally Posted by Tech_n

I have a 97 Grand Prix GT with 154,000 miles on it

When I am sitting at a light for a long time the temperature gauge start to move up close to the needle before the red and then when I start driving the car it stays under 210.

I am trying to figure out why this happens because I flushed the radiator system and changed the therm with a delco therm and the problem is still occurring, can somebody please help me out?

Is this with AC on or off? And do you know if your electric fans are kicking in at all? What degree thermostat did you put in?



Thrasher CAI, DHP v1.0 ECU, Granatelli CAI Tuneable MAF,
3.4 SC pulley, Hi-Flow CAT, u-bend delete, 180 TS,
TB spacer, MSD 8.5mm wires, AC Delco 41-932 spark plugs,
Goodyear Gatorback Serp. & SC Belt
ET: 14.3 @ 96 mph

[jimmytroanoke]

Originally Posted by Tech_n

I have a 97 Grand Prix GT with 154,000 miles on it

When I am sitting at a light for a long time the temperature gauge start to move up close to the needle before the red and then when I start driving the car it stays under 210.

I am trying to figure out why this happens because I flushed the radiator system and changed the therm with a delco therm and the problem is still occurring, can somebody please help me out?

probably because GM has programmed the fans to not kick on until 230 according to a GM tech. You may want to check them and make sure they are working. I had the same issue, but not quite to the red. Mine didn't do it if the a/c was on because then the fans ran constantly, only did it with the air off.

[BNaylor]

Originally Posted by jimmytroanoke

probably because GM has programmed the fans to not kick on until 230 according to a GM tech. You may want to check them and make sure they are working. I had the same issue, but not quite to the red. Mine didn't do it if the a/c was on because then the fans ran constantly, only did it with the air off.

Yeah, I've heard that too. GM engineered their cars to run hot in an effort to have the air and fuel burn more completely allegedly producing less hydrocarbons for emissions purposes. The primary fan should kick in around 222 degrees or higher and secondary around 243 degrees.

I'm glad I don't have to worry about that. My fans start to kick in at 186 degrees due to the re-programmed DHP ECU.


Thrasher CAI, DHP v1.0 ECU, Granatelli CAI Tuneable MAF,
3.4 SC pulley, Hi-Flow CAT, u-bend delete, 180 TS,
TB spacer, MSD 8.5mm wires, AC Delco 41-932 spark plugs,
Goodyear Gatorback Serp. & SC Belt
ET: 14.3 @ 96 mph

[Tech_n]

Originally Posted by Tech_n

I have a 97 Grand Prix GT with 154,000 miles on it

When I am sitting at a light for a long time the temperature gauge start to move up close to the needle before the red and then when I start driving the car it stays under 210.

I am trying to figure out why this happens because I flushed the radiator system and changed the therm with a delco therm and the problem is still occurring, can somebody please help me out?

The car do not never go in the red, but when I am sitting at a light, the needle move towards the second to last line and stays there.
I do not know why, but it do.
I checked the fans and both of them are spinning.The thermo that was issued to me was 180 degrees, so I am lost.

[BNaylor]

Originally Posted by Tech_n

The car do not never go in the red, but when I am sitting at a light, the needle move towards the second to last line and stays there.
I do not know why, but it do.
I checked the fans and both of them are spinning.The thermo that was issued to me was 180 degrees, so I am lost.

Checkout this message thread on AF Grand Prix forum. Info may be helpful. He had a clogged radiator (5 internal lines) causing his overheating problem. His flushing didn't help and had to take it to a professional. Plus when you did the flush was the air bled out if the system? In his case we suspected that the Dexcool went South on him
and possible contamination with regular green anti-freeze and failure to bleed air out of the cooling system. Good luck!

http://www.automotiveforums.com/vbul...d.php?t=412507



Thrasher CAI, DHP v1.0 ECU, Granatelli CAI Tuneable MAF,
3.4 SC pulley, Hi-Flow CAT, u-bend delete, 180 TS,
TB spacer, MSD 8.5mm wires, AC Delco 41-932 spark plugs,
Goodyear Gatorback Serp. & SC Belt
ET: 14.3 @ 96 mph