defrost
#1
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i have a 1999 civic lx. when I turn the **** to defrost the ac light does not come on and air does not come out of the defrost vents. I don't know what is going on and wondering if there is a fix that I can do myself. what is the prob.
#2
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Re: defrost
Even when it is set to defrost the AC won't come on until the fan switch is turned. Do the fans work at all? Try the fan switch at all settings and tell us the results.
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when switching it to the defrost mode the ac should automatic turn on and it does not. and the air does not blow through the defrost vents at all. even if manually turning on the a/c
#4
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Re: defrost
In my 99 Civic the AC does not come on in defrost mode unless the fan switch is turned on (and the fan is working). If your fan only works at it highest setting then it's probably the power transistor. If your fan doesn't work period then fuse,blower motor, input power to the blower. If your fan works intermittently then fan switch.
...but your problem is fan related not defrost/AC related.
...but your problem is fan related not defrost/AC related.
#6
Re: defrost
ok, so when you have the selector set to blow on your feet it blows just fine.... Same with the front facing vents. But you turn the defroster on and.... does the fan stil blow and the air just isnt coming out on the windshield? or does your fan turn off when you select defrost....
I believe the selector is vacuum operated... might start checking vac lines under dash if the fan stil blows on defrost but the air just isnt diverted to the windshield. However if the fan turns off when you select defrost you have other issues.
Give us more info so we can help you better/easier.
I believe the selector is vacuum operated... might start checking vac lines under dash if the fan stil blows on defrost but the air just isnt diverted to the windshield. However if the fan turns off when you select defrost you have other issues.
Give us more info so we can help you better/easier.
#7
If you think a good mechanic is expensive, try hiring a bad one
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sorry took a while to read. you are right the air come to the feet when selected and then to the upper or face and then when turning it to the windshield there is no air coming out. and it is electrical not vacuum
#9
If you think a good mechanic is expensive, try hiring a bad one
Re: defrost
Where is the air coming out? (floor outlets or dash vents)
Got a friend with an identical car that works right? Swap the HVAC controller and see what happens.
#11
If you think a good mechanic is expensive, try hiring a bad one
Re: defrost
At this rate, your cold season (if you have one of those) will be over before you get this problem figured out.
I'm sticking with this guess: Locate a known good HVAC controller to swap as a test.
I'm sticking with this guess: Locate a known good HVAC controller to swap as a test.
#12
Re: defrost
Have the same problem with a 1999 Civic DX. The, now wife, says the windshield defroster stopped working when the windshield was replaced. Do not see any correlation there.
Air does blow out the vents at each end of the dashboard to defrost driver and passenger side windows. The side windows do clear up after short time when frosted.
Guessing I also need to check into a HVAC controller.
Air does blow out the vents at each end of the dashboard to defrost driver and passenger side windows. The side windows do clear up after short time when frosted.
Guessing I also need to check into a HVAC controller.
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