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Heater Only Work When Drive

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Old 10-25-07, 08:19 AM
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vugoodoll
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Default Heater Only Work When Drive
Hey guys,
My car heater only blow heat when the car is moving, when I stop at red light then it start blowing cold air instead of heat. This happen also as well when the car idle in (P), then when I give some rev then heat start coming out. Please help me trouble shoot this.

Thanks for all your input.

95 SC400
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Old 10-25-07, 08:31 AM
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Mine does the same. I'm just too lazy to fix it.

In any case, it is most likely your heater servo or clogged hose

If not, but very unlikely... it could be your water pump slowly going out.
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Old 10-25-07, 09:19 AM
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Its probably the heater valve.
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Old 10-25-07, 09:26 AM
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(1) moved to proper forum

(2) top off your coolant.
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Old 10-25-07, 10:33 AM
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Originally Posted by O. L. T.
(2) top off your coolant.

I got $20 on this answer.
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Old 10-26-07, 01:24 PM
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Ok guys, thanks for all your input. I check the coolant and it full. When the engine is on the coolant tank suppose to be empty on lexus? I know on Honda the coolant in the over flow tank just stay where it is but on lexus all the coolant been suck out of the tank?
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Old 10-26-07, 01:36 PM
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Originally Posted by vugoodoll
Ok guys, thanks for all your input. I check the coolant and it full. When the engine is on the coolant tank suppose to be empty on lexus? I know on Honda the coolant in the over flow tank just stay where it is but on lexus all the coolant been suck out of the tank?
Nope. You sound low. Burp the system, probably air in the system.
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Old 11-07-07, 06:16 PM
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sc400injen
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anybody have the heater totally go out? my gauge says max hot and blows no air on auto but i can increase the fan speed but it is cold air, almost sounds like a control module, any help would be greatly appreciated
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Old 11-07-07, 06:18 PM
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^^ search "heater core control valve" or variants of.......

Ok guys, thanks for all your input. I check the coolant and it full
If I had a dollar for every time someone said "my coolant is full" when their heater didn't work I'd be rich. TOP IT OFF. "make it rain"
Last edited by O. L. T.; 11-07-07 at 06:25 PM.
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Old 11-07-07, 06:24 PM
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Lemme show everyone this biichen little search engine we got in this here establishment........ This outta turn your grey skies blue...........

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Old 11-08-07, 10:14 AM
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^ Thanks OLT

Did it earlier in the morning and my heater is working just fine now.
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Old 11-08-07, 04:46 PM
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Default OLT= Funny
Subtle...
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Old 11-08-07, 08:04 PM
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Originally Posted by O. L. T.
(1) moved to proper forum

(2) top off your coolant.
I had the same problem and did an entire radiator flush, topped it off with new coolant, and POOF! Like new.
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Old 03-26-08, 04:02 PM
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sc400injen
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**** i know it's late but preciate it yall


-Knowledge
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