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GMC Repair/optimum temperature

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Expert: CAJUNSC/RAMBLER390 - 1/12/2009


Question
2000 GMC K2500 pickup 5.7l vin code R
Problem temp gauge hovering at 160.
Changed thermostat 2x, new ECT sensor, flushed cooling system 2x. Heat is working great. Upper radiator hose is warm, not hot. I can hold onto it.
The fan clutch seems to be working (is there a way to test the clutch?)

thanks in advance

Answer
Hi
Could be a guage issue, have vehicle scanned and look at ECT temp on a scan tool vs. temp displayed on guage.
Also the ECT sensor for guage is in left head (1 wire green), just above #1 spark plug.
There also is one on manifold (2 wires yellow and black).
Have a experienced auto mechanic check the clutch, although I doubt it is making vehicle run too cool. If bad like this it would be spinning just like a straight bolted fan (same speed as engine).
Hope this helps
God Bless

GMC Repair

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1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Engine mechanical. Automatic or Standard Transmissions. Drive Line (drive shafts, axles) Rear and front differentials and 4wd Transfer Cases. Tires and wheels. ABS. HVAC. Air Bag (SIR). Interior, seats, etc... 6.6L Duramax Diesel diagnosis. 6.5L diesel diagnosis. I WILL not answer Alignment questions OR carburetor questions.
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18 Years GM Dealership experience as an "A" line tech. ASE Master Technician. A-9 Light duty Diesel certified as of 2011. 100% GM certified MTC Certified. GM World Class Technician.

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