Heater problem

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05-07-09, 02:04 PM

Sid Ellner

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Heater problem

I have a 93 LS400. I can set the temperature at Max and only get cold air. I am unable to get any heat. The AC works fine. Help

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05-08-09, 04:21 PM

qewani1

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did you tried increasing the temp ?

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05-09-09, 10:30 PM

ucfjon

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If you are properly operating the climate control system, then your problem could be either with the heater core being clogged or the heater core valve could be stuck closed.

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06-08-09, 12:24 PM

Reedearl

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I made the mistake of using a Radiator Stop Leak product. It caused my heater to be clogged up (I get little or no heat). I will try to flush my cooling system to see if it will come out.

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06-08-09, 02:41 PM

DoktorYes

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Sid Ellner:Check the water heater valve,it's under the hood in the middle of the firewall,small black valve, control cable that should move up or down as you operate the temp switch.