1999 GMC

my heat would at first was working then it started coming on when it wanted to. for the past three days it has not came on but the heat from the motor helps keep the car warm. what is my car problem


1 thought on “1999 GMC”

  1. Your cooling system has a leak in it and is low on coolant. You may keep the cooling system full of coolant to achieve heat but recommend repairing the leak asap.

    How to locate a coolant system leak:
    Top off cooling system.
    Use a cooling system pressure tester and pressurize the cooling system and inspect for leak.

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