1993 Cadillac Deville, 4.9 liter eng. I have no heat. I have replaced the thermostat and radiator cap. Meanwhile, I have not seen any leaks. Nonetheless, how do I troubleshoot the no heat problem from here.
by 
Mckinley
ANSWERS: 1
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Most cars use vacuum controls for opening and closing the water valve that connects to your heater hoses. If your's does, check your vacuum lines for a leak or a break.
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