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2004 Pontiac GP running on hot side #4807350
07/07/18 06:10 AM
07/07/18 06:10 AM
Joined: Dec 2011
Posts: 837
US
clarkflower Offline OP
clarkflower  Offline OP

Joined: Dec 2011
Posts: 837
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?




Last edited by clarkflower; 07/07/18 06:19 AM.
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807355
07/07/18 06:20 AM
07/07/18 06:20 AM
Joined: Sep 2008
Posts: 2,034
Pennsylvania
Boomer Offline
Boomer  Offline

Joined: Sep 2008
Posts: 2,034
Pennsylvania
Are the fins in the radiator full of debris? Water pump OK? Thermostat failing?


2013 VW Passat TDI SE, 65,100 miles Castrol Professional VW507 5W-30
2017 VW Golf All Track 21,170 miles Castrol Professional VW505 5W-40
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807359
07/07/18 06:25 AM
07/07/18 06:25 AM
Joined: Dec 2011
Posts: 837
US
clarkflower Offline OP
clarkflower  Offline OP

Joined: Dec 2011
Posts: 837
US
Thanks
No
Do water pumps fail like that or do they just go completely?
Could be.

Last edited by clarkflower; 07/07/18 06:25 AM.
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807360
07/07/18 06:25 AM
07/07/18 06:25 AM
Joined: Nov 2006
Posts: 21,258
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,258
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: 2004 Pontiac GP running on hot side [Re: Trav] #4807362
07/07/18 06:27 AM
07/07/18 06:27 AM
Joined: Dec 2011
Posts: 837
US
clarkflower Offline OP
clarkflower  Offline OP

Joined: Dec 2011
Posts: 837
US
Thanks Trav..Its a GT but it looks clean.

Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807373
07/07/18 06:56 AM
07/07/18 06:56 AM
Joined: Nov 2006
Posts: 21,258
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,258
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


ASE L1, Master. Deutsch Meisterbrief.
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807402
07/07/18 07:41 AM
07/07/18 07:41 AM
Joined: Nov 2011
Posts: 1,473
Lyndhurst NJ
Audios Offline
Audios  Offline

Joined: Nov 2011
Posts: 1,473
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.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW Twin Power 10/60
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Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807410
07/07/18 08:04 AM
07/07/18 08:04 AM
Joined: Oct 2004
Posts: 8,749
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused

Joined: Oct 2004
Posts: 8,749
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.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807425
07/07/18 08:24 AM
07/07/18 08:24 AM
Joined: May 2005
Posts: 533
Idaho
sprite1741 Offline
sprite1741  Offline

Joined: May 2005
Posts: 533
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.


2005 Grand Prix GXP 5.3L Supertech Synthetic Dexos 5w30 Fram Ultra 3506
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Re: 2004 Pontiac GP running on hot side [Re: Trav] #4807508
07/07/18 09:47 AM
07/07/18 09:47 AM
Joined: Dec 2011
Posts: 837
US
clarkflower Offline OP
clarkflower  Offline OP

Joined: Dec 2011
Posts: 837
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..

Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807514
07/07/18 09:54 AM
07/07/18 09:54 AM
Joined: Aug 2003
Posts: 13,432
NE,Ohio
Rand Offline
Rand  Offline

Joined: Aug 2003
Posts: 13,432
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?


2019 Jeep Cherokee Trailhawk 2.0T
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807524
07/07/18 10:06 AM
07/07/18 10:06 AM
Joined: Jun 2003
Posts: 18,428
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,428
Deplorable in apple valley, ca
Flush the bugs out of the core. Feel for cold spots if you can get your fingers in there.

Last edited by Chris142; 07/07/18 10:06 AM.

02 Wrangler carlube 5w30
87 F250 traveler 15w40
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Re: 2004 Pontiac GP running on hot side [Re: sprite1741] #4807539
07/07/18 10:18 AM
07/07/18 10:18 AM
Joined: Dec 2011
Posts: 837
US
clarkflower Offline OP
clarkflower  Offline OP

Joined: Dec 2011
Posts: 837
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?

Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807591
07/07/18 11:22 AM
07/07/18 11:22 AM
Joined: Jan 2017
Posts: 2,546
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 2,546
VW Fanboy Island
"Widetrack" LOL


03 Jetta AWP/09A 205k kms
Edge 0W40 + Mann 719/30
Re: 2004 Pontiac GP running on hot side [Re: clarkflower] #4807595
07/07/18 11:25 AM
07/07/18 11:25 AM
Joined: Dec 2006
Posts: 1,024
midwest
JamesBond Offline
JamesBond  Offline

Joined: Dec 2006
Posts: 1,024
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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