Jake93 Posted June 22, 2022 Report Share Posted June 22, 2022 So with recently purchasing my 2nd W-body pontiac, my previous one was a GXP. My current 05' GT the temp gauge will fluctuate between 1/2 and 3/4 marks. If im moving with the A/C on or off, it'll drop some. Now if im sitting still idiling, it will move up slightly with my A/C running of course. If i shut off my A/C it will go up to exactly 3/4. No leaks that i can see, no overheating, fans come as usual. I'm thinking thermostat is wonky? 97k 3800NA motor. Thank you! Quote Link to comment Share on other sites More sharing options...
RPE1992GPSE Posted June 22, 2022 Report Share Posted June 22, 2022 (edited) Do you have access to a code scanner that can read live data? Have you checked your coolant level? Edited June 22, 2022 by RPE1992GPSE Quote Link to comment Share on other sites More sharing options...
Jake93 Posted June 22, 2022 Author Report Share Posted June 22, 2022 My buddy has a good scanner that can read live data. Coolant level is good. Otherwise the car is mechanically sound. I will be changing out the OEM plastic 90° elbows for the aluminum ones in the near future. Quote Link to comment Share on other sites More sharing options...
94 olds vert Posted June 22, 2022 Report Share Posted June 22, 2022 I'd probably check on the fans to make sure they are operating properly. Quote Link to comment Share on other sites More sharing options...
55trucker Posted June 22, 2022 Report Share Posted June 22, 2022 Are you certain beyond a doubt that the cooling system does not need bleeding? Quote Link to comment Share on other sites More sharing options...
RPE1992GPSE Posted June 23, 2022 Report Share Posted June 23, 2022 You could also try pressure testing the system. It could reveal a small leak somewhere. Quote Link to comment Share on other sites More sharing options...
Jake93 Posted June 23, 2022 Author Report Share Posted June 23, 2022 (edited) 19 hours ago, 55trucker said: Are you certain beyond a doubt that the cooling system does not need bleeding? I have a feeling it may have air in the system somewhere or my thermostat isn't opening until later. Normal temp range is 220°? I could be wrong. Its been a hot minute since ive last owned a series 3 3800. Edited June 23, 2022 by Jake93 Quote Link to comment Share on other sites More sharing options...
Jake93 Posted June 23, 2022 Author Report Share Posted June 23, 2022 3 hours ago, RPE1992GPSE said: You could also try pressure testing the system. It could reveal a small leak somewhere. Always could, there is a probability there's a small pinhole leak in a hose or something. Fans do come on as normal though. Quote Link to comment Share on other sites More sharing options...
Jake93 Posted June 23, 2022 Author Report Share Posted June 23, 2022 21 hours ago, 94 olds vert said: I'd probably check on the fans to make sure they are operating properly. I have and they do in fact work. They obviously come on when the A/C is running as well. But i have a blue wire that is grounded at the top radiator support brace (driver's side) and i followed it down to the fans and then it disappears somewhere down low probably by the fan motors to either fan. I'll double check on my lunch and get back to ya! Quote Link to comment Share on other sites More sharing options...
55trucker Posted June 23, 2022 Report Share Posted June 23, 2022 44 minutes ago, Jake93 said: I have a feeling it may have air in the system somewhere or my thermostat isn't opening until later. Normal temp range is 220°? I could be wrong. Its been a hot minute since ive last owned a series 3 3800. Air will cause the gauge to fluctuate, bleed the system, if there is indeed a small leak the system pressure (15lbs) would force the fluid out, you'd notice it & you'd be repeatedly filling the system. If you suspect the stat pull it out & drop into a pot of near boiling water (use a candy thermometer) & monitor what temp it opens. Quote Link to comment Share on other sites More sharing options...
Jake93 Posted June 24, 2022 Author Report Share Posted June 24, 2022 19 hours ago, 55trucker said: Air will cause the gauge to fluctuate, bleed the system, if there is indeed a small leak the system pressure (15lbs) would force the fluid out, you'd notice it & you'd be repeatedly filling the system. If you suspect the stat pull it out & drop into a pot of near boiling water (use a candy thermometer) & monitor what temp it opens. Roger that! Quote Link to comment Share on other sites More sharing options...
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