Question about 1999 Saturn SL

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The heat/defrost won't work

I have a 1999 Saturn and I can't seem to figure out why my heat or defrost won't work. I have a hard time driving because the windows keep fogging up even with the defrost on. My back defroster doesn't work either. Also my heat doesn't work at all, I've even left it on for 10 minutes and not a single bit of warmth happened. Please help!

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This can be caused by a stuck blend door or a clogged heater core. Can you hear the blend door moving when you turn the temp knob? If not, it may have disconnected from the control panel or blend door. If the door works, remove the heater core and flush it or replace it.

Posted on Sep 02, 2017


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Posted on Jan 02, 2017



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SOURCE: 1999 Saturn SL

Cat. converter probably pluged. Mine did same today. Mechanic who tow my car said likely cause. I can hear fuel pump running, recent change fuel filter will check fuel pressure. But I will try emissionwiz fit too.

Posted on Oct 12, 2008


  • 33 Answers

SOURCE: 1996 Saturn's heater not working right

heatercore is done

Posted on Dec 08, 2008


  • 15 Answers

SOURCE: Saturn rear defrost and reverse lights not working

hey check your fusses under the hood and inside the car.

Posted on Jan 12, 2009


  • 123 Answers

SOURCE: 99 saturn no heat or defrost

Sounds like your heater core is mostly stopped up. You need to have your cooling system back flushed and cleaned.

Posted on Sep 12, 2009



  • 4803 Answers

SOURCE: 2006 Saturn Relay 3: My heat does not work. Not

First, check your engine coolant level. If it is low, you need to find out why. If the coolant level in the radiator is full, it could be many things including a bad thermostat, a clogged heater core, or a broken or damaged air temperature door or actuator.

Posted on Jan 22, 2011

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