Heater Only Work When Drive
Thread Starter
Driver
Joined: Sep 2006
Posts: 166
Likes: 0
From: tx
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
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
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.
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.
Thread Starter
Driver
Joined: Sep 2006
Posts: 166
Likes: 0
From: tx
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?
Zombie Slayer
Joined: May 2004
Posts: 6,053
Likes: 3
From: East Bumble F, NJ
Nope. You sound low. Burp the system, probably air in the system.
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Driver School Candidate
Joined: Mar 2006
Posts: 48
Likes: 0
From: fl
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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^^ search "heater core control valve" or variants of.......
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" 
Ok guys, thanks for all your input. I check the coolant and it full
"make it rain"
Last edited by O. L. T.; Nov 7, 2007 at 06:25 PM.
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Lead Lap
Joined: Jun 2005
Posts: 3,527
Likes: 78
From: Crappy ol' Texas
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