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#1
05-04-2012, 08:47 PM
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Bad Coolant Temperature Gauge
Is it possible to replace the coolant temp. gauge in an '02 GT without replacing the rest of the cluster - to avoid tampering with the odometer?
If not, what best aftermarket gauge would you recommend installing to replace a bad temp. gauge? I want to make sure I get a good one so that I don't have to mess with it again. I can't afford anything over $50. Thanks!
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#2
05-05-2012, 07:40 PM
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Re: Bad Coolant Temperature Gauge
I beleive it has to be the whole cluster. I am not sure if there is a way to tap into the system to put an aftermaket sensor on there. Not much you can do for under $50
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L 
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Brandybuck (05-06-2012)
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#3
05-06-2012, 09:44 AM
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Re: Bad Coolant Temperature Gauge
My question is how do you know for sure the instrument cluster temp gauge is not reading properly? Be careful going with diagnostics from scan tools that show temperature that are not properly calibrated or compatible. The only scan tool that is really accurate is a GM Tech 2.
Was the coolant temperature sensor resistance checked for calibration based on ambient temperature?
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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Brandybuck (05-06-2012)
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#4
05-06-2012, 01:42 PM
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Re: Bad Coolant Temperature Gauge
A mechanic at the dealership at which I work used an infrared thermometer to measure the temperature of the thermostat housing. He obtained a temperature of about 194 F on the housing, while the gauge read 230-240 F.
Another mechanic later used his scan computer to measure the PCM coolant temperature - that was 201 F. Both mechanics concluded that it was probably my gauge. One said that it wasn't too surprising for GM clusters to fail. I would have liked to see if I could repair the gauge individually, but the consensus seems to be that it isn't possible. If anyone thinks otherwise, let me know! I'm not afraid of detailed, time-consuming work to repair this gauge without tampering with the odometer or buying a new gauge.
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