Cooling question
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Sounds like you have air in the system!
It is working and then when the pocket comes around you end up with a higher temp then comes the water and your at your lower temp!
Check your fluids to see if they are full to the top!
Thanks,Matt
It is working and then when the pocket comes around you end up with a higher temp then comes the water and your at your lower temp!
Check your fluids to see if they are full to the top!
Thanks,Matt
Thread Starter
Pro
Joined: Apr 2007
Posts: 650
Likes: 4
From: Pittsburg Ca.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
It has a new belt it was changed when the pump was. I dont think its the temp sensor because, Normally when those go bad they will peg and you will get the overheating bells. It cant be the pump because if it was it wouldnt be pumping water and it would over heat completely or leak allover the place like my old one did. So my guess is as previously stated its just a higher temp t-stat and therefore an increase in temps. It still hasnt gotton hot enough to even kick on the cooling fans. 
A temp swing is usually caused by one of a few things ... one is air/water passing the sensor ... you say you've eliminated that ... the pump is not flowing properly (surging) ... or the thermo is not working properly.
Try the "old" thermo back in the engine ... see if that gives you a consistent temp. If it doesn't, its either got to be the sensor or the water pump.
Thread Starter
Pro
Joined: Apr 2007
Posts: 650
Likes: 4
From: Pittsburg Ca.
If all you saw was an increase in temp ... say the car ran a steady 210 degrees ... then I'd agree ... but the temp swing you initially posted is DEFINATELY not normal ... swinging between 196 to 210. And remember, the coolant is only measuered at one point in the system ... who knows what is happening in the otehr head if you are seeing this problem.
A temp swing is usually caused by one of a few things ... one is air/water passing the sensor ... you say you've eliminated that ... the pump is not flowing properly (surging) ... or the thermo is not working properly.
Try the "old" thermo back in the engine ... see if that gives you a consistent temp. If it doesn't, its either got to be the sensor or the water pump.
A temp swing is usually caused by one of a few things ... one is air/water passing the sensor ... you say you've eliminated that ... the pump is not flowing properly (surging) ... or the thermo is not working properly.
Try the "old" thermo back in the engine ... see if that gives you a consistent temp. If it doesn't, its either got to be the sensor or the water pump.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,819
From: Charlotte, NC (formerly Endicott, NY)
No Matt I took care of that problem this morning. I did the routine and resivoir is filled right to the base. I just wished someone new what thermostat comes in the GM pump for the 2004s. Ive read somewhere it may have a 212 t-stat in it which explains what is doing or its a 195 that is way off. Its not a big job to change it so I think Im gonna get the 187 and see what happens......
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
mine does the same thing 210-215 at idle at lights and then drops to 190 on the freeway.
if i turn on the a/c temps stay 200 ish at lights and drops like a rock to 189 0n the freeway.
this sure sounds normal to me considering the high fan settings and my 187 t stat
what you guys think?
if i turn on the a/c temps stay 200 ish at lights and drops like a rock to 189 0n the freeway.
this sure sounds normal to me considering the high fan settings and my 187 t stat
what you guys think?
Thread Starter
Pro
Joined: Apr 2007
Posts: 650
Likes: 4
From: Pittsburg Ca.
mine does the same thing 210-215 at idle at lights and then drops to 190 on the freeway.
if i turn on the a/c temps stay 200 ish at lights and drops like a rock to 189 0n the freeway.
this sure sounds normal to me considering the high fan settings and my 187 t stat
what you guys think?
if i turn on the a/c temps stay 200 ish at lights and drops like a rock to 189 0n the freeway.
this sure sounds normal to me considering the high fan settings and my 187 t stat
what you guys think?
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Thread Starter
Pro
Joined: Apr 2007
Posts: 650
Likes: 4
From: Pittsburg Ca.
Update: Seem to have fixed problem. Drained coolent put new 186 degree thermo in. And in 75 degree heat dosnt run over 198 get into stop and go traffic jumps to 210-214 and the minute i get out of stop and go drops right back down to 198.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
The temp variations you're experiencing in your original post are normal. I have experienced these minor variations on the highway for years and it depends mainly on ambient temps being experienced at the particular point in time/location you're driving.
HTH
