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#4807350 - 07/07/18 06:10 AM 2004 Pontiac GP running on hot side
clarkflower Offline


Registered: 12/27/11
Posts: 743
Loc: US
Hi

My 2004 Pontiac Grand Prix 90k has started to run on the hot side (hotter than I'm used to) while sitting stopped in traffic. It is very hot here. It does not get to the red but on the gauge shown here I'm getting close. About 5/8 with 3/4 being red. Normally I don't run above 7/16 maybe 1/2 at a red light and then it drops to 5/16. Now it's only dropping to 1/2 when I start running although it seenms to be a bit erratic. Drops to 1/2-7/16 and quickly pops back to 9/16, then back to 1/2 at a steady 50 mph.

http://gtcarlot.com/data/Pontiac/Grand+Prix/2004/1555158/Gauges-44231528.html GP Temp

expected it to be low on fluid but it was full. Both fans run. No anti freeze in the oil.
It did this 6 months ago after I bought the car. I added fluid and its been fine since till now.

Any thoughts?





Edited by clarkflower (07/07/18 06:19 AM)

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#4807355 - 07/07/18 06:20 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Boomer Online   content


Registered: 09/19/08
Posts: 1941
Loc: Pennsylvania
Are the fins in the radiator full of debris? Water pump OK? Thermostat failing?
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#4807359 - 07/07/18 06:25 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
clarkflower Offline


Registered: 12/27/11
Posts: 743
Loc: US
Thanks
No
Do water pumps fail like that or do they just go completely?
Could be.


Edited by clarkflower (07/07/18 06:25 AM)

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#4807360 - 07/07/18 06:25 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
I would get a new OE thermostat and Citric acid flush the system. As the other poster mention flush the radiator fins from behind.
Check the temp with a scan tool. If its a GTP it already has the thicker radiator, which is a good upgrade for the SE and GT.
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#4807362 - 07/07/18 06:27 AM Re: 2004 Pontiac GP running on hot side [Re: Trav]
clarkflower Offline


Registered: 12/27/11
Posts: 743
Loc: US
Thanks Trav..Its a GT but it looks clean.

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#4807373 - 07/07/18 06:56 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
Water pumps on these are not known to come apart, the bearings fail sure but its a noticeable and usually noisy fail.
A GTP radiator (OE) would be a great upgrade to this cars cooling system.
I got one (OE Modene made in Canada) of ebay one time for $50 because the guy thought it was too thick and wouldn't fit and sold it. GM used 10mm spacers from the factory to put the thinner radiators in the SE and GT, just leave them out and it fits perfectly.

Look at Rock for the delco OE for the GTP it is about $150 and well worth it, Delco was OE in 04, Modene the earlier ones. Same deal toss the spacers to fit. Temps will drop considerably, the part # ACDELCO 21555
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#4807402 - 07/07/18 07:41 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Audios Offline


Registered: 11/19/11
Posts: 951
Loc: Lyndhurst NJ
Its possible that the vanes are worn on the pump, so its effectively flowing less coolant at idle than it should be. Id take a look at the pump, or you can try a coolant additive like water wetter to give it a little extra boost in the cooling power.
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#4807410 - 07/07/18 08:04 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
bullwinkle Offline


Registered: 10/09/04
Posts: 7726
Loc: Cincinnati, OH, USA
A cheap IR gun could be a good investment here-is it possible that the sender & gauge are incorrect? Shooting the thermostat housing when hot usually will give you an idea.
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#4807425 - 07/07/18 08:24 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
sprite1741 Offline


Registered: 05/02/05
Posts: 451
Loc: Idaho
Did you check the coolant in the engine or just the overflow tank? I have seen engines low on coolant but still reading normal in the plastic tank. Means a leak somewhere. My V8 GP has been running in the middle in traffic but drops slightly when back to speed. I had a GTP before, I seem to remember on the V6 there was an cooling system air bleeder on it. Could have some trapped air. I remember fighting it once after a coolant change. Had an air lock. Might check for air in the engine.
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#4807508 - 07/07/18 09:47 AM Re: 2004 Pontiac GP running on hot side [Re: Trav]
clarkflower Offline


Registered: 12/27/11
Posts: 743
Loc: US
Thanks Trav... As you know Im on SS now so I'm trying to keep some reserve in case I need intake manifold gaskets done.

I just did the thermostat..

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#4807514 - 07/07/18 09:54 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Rand Offline


Registered: 08/20/03
Posts: 12726
Loc: NE,Ohio
Originally Posted By: clarkflower
Thanks Trav... As you know Im on SS now so I'm trying to keep some reserve in case I need intake manifold gaskets done.

I just did the thermostat..


just did the thermostat? was that after or before it started getting hotter?

did you use an OE part? most aftermarket are junk.

Possible air in the system?
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#4807524 - 07/07/18 10:06 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
Chris142 Offline


Registered: 06/05/03
Posts: 16957
Loc: Deplorable in apple valley, ca
Flush the bugs out of the core. Feel for cold spots if you can get your fingers in there.


Edited by Chris142 (07/07/18 10:06 AM)
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#4807539 - 07/07/18 10:18 AM Re: 2004 Pontiac GP running on hot side [Re: sprite1741]
clarkflower Offline


Registered: 12/27/11
Posts: 743
Loc: US
Thanks. Because it was so hot I only checked it in the expansion tank and it was a little bit low in the actual radiator this morning.

Where it was low before, iím thinking I may have a small water leak somewhere but nothing visible.
The guy at the GM dealer thought I might need intake manifold gasketís because he said he saw oil.

I did the thermostat this morning after I was running hot and Iíve been out most of the mornning. It seems fine but I also added coolant to the radiator.
Seems I lost 1/4 gallon in 5 months?

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#4807591 - 07/07/18 11:22 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
maxdustington Offline


Registered: 01/21/17
Posts: 868
Loc: Toronna
"Widetrack" LOL
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#4807595 - 07/07/18 11:25 AM Re: 2004 Pontiac GP running on hot side [Re: clarkflower]
JamesBond Offline


Registered: 12/13/06
Posts: 862
Loc: midwest
I would make sure that the cap is clean and holding correct pressure and that the hose from the radiator to the overflow tank is clear and is tightly sealed at both ends.

If your radiator is low and the overflow tank is normal the radiator could pe pushing out water as it warms up as usual but sucking in air as it cools down due to a bad cap or hose.

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