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2005 GMC Canyon Question: What would cause truck to overheat when air conditioner is on?



, Redding, CA, May 10, 2012, 00:03

Shop says it is a plugged radiator and that it cannot be fixed but must be replaced at a cost of $800.

2 Answers
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  • Answer #1

    May 10, 2012, 03:32

    Possible Causes in overheating :
    1. Engine coolant level may be very low.
    The Fix: Refill coolant to proper level.
    2. Engine's drive belts may be broken or slipping.
    The Fix: Tighten or replace belts.
    3. The electric cooling fan may not be coming on.
    The Fix: Repair or replace cooling fan. Repair wiring. Replace cooling fan temp sensor.
    4. The ignition timing may be set wrong.
    The Fix: Adjust ignition timing.
    5. There may be a vacuum leak.
    The Fix: Check and replace vacuum lines as required.
    6. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
    7. The engine's thermostat may be stuck closed.
    The Fix: Replace thermostat.
    8. There may be a leak in the cooling system.
    The Fix: Repair leak and refill coolant. Cylinder head gasket(s) may be bad.
    The Fix: Replace cylinder head gasket(s).

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  • Answer #2

    Greg's Orange Auto (15380 Answers) , Orange, CA - (714) 361-9386
    globalhelper May 10, 2012, 09:42

    china is correct all these can be an issue. fan clutch may be bad but its like 400.00. seek a 2nd opinion that would help

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