Question about 1999 Saturn SC

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No heat I have a '99 Saturn SC1. Recently I have noticed that I am not getting any heat from the heater. I replaced the thermostat but there is still no heat coming out of the vents. All fans and heater cord are working correctly. What do I do?

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This sounds like one of two things, either there is not enough coolant in the system, or the heater control system is messed up. try this, with your car running at about 205 degrees (feel the upper radiator hose, it should be hot to the touch) grab both of the hoses going into the heater core behind the engine, the should be warm to hot. if they're not warm at all, or just luke warm, you either don't have enough coolant, or the hoses are blocked somewhere. if there is a valve in line with one of the hoses, try to operate it by hand, sometimes those valves (called heater valves) fail.

if the coolant is full and there is hot coolant in both hoses going into the heater core, then you're controls inside are likely the problem. try to turn the heat control from cold to hot and back again a few times, you should be able to hear a clapping sound,it might be very faint, so listen carefully. if you can't hear anything, it's likely the controls itself, unless you hear a hissing sound from behind the dash when you turn the control, that would be a vaccuum line unhooked. you'll have to pull some panels under the dash to find this vaccuum line to hook it up, but it's not too hard , just takes patience. (it's more common for a heater control to go first)

Posted on Jan 24, 2009

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Make sure the radiator is full of coolant.if that dosent work you maybe looking at a bad heater core

Posted on Jan 24, 2009

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