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Topic: Climate controls stuck on defrost (Read 1905 times) previous topic - next topic

Climate controls stuck on defrost

My climate controls are stuck on defrost no matter what i select anyone have an idea?
88 Cougar
88 T-Bird
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Climate controls stuck on defrost

Reply #1 –
Manual controls?  If so, it's usually a broken vacuum line.
1986 Mercury Cougar - 2.3T/T5 swap, TC brakes and suspension and rearend, 3" exhaust, 255 lph fuel pump, Stinger BOV, Gillis MBC @ 18 psi
2003 Chevy Suburban Z71 - Daily driver
2015 Chevy Volt - Wife's daily driver

Climate controls stuck on defrost

Reply #2 –
Vacuum leak. It will default to defrost for safety, since you've gotta see
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

Climate controls stuck on defrost

Reply #3 –
Oh boy is there an easy way to find the leak?
88 Cougar
88 T-Bird
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Climate controls stuck on defrost

Reply #4 –
figured it out its the vacuum control valve
88 Cougar
88 T-Bird
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Climate controls stuck on defrost

Reply #5 –
I probably have a good working one that I could sell you if you need it. Do you have a pic of what it looks like?

Climate controls stuck on defrost

Reply #6 –
Quote from: 50RACER;462165
I probably have a good working one that I could sell you if you need it. Do you have a pic of what it looks like?

i looked at it a bit more and it was a massive vacuum leak at the vacuum ball thing you got one of those?
88 Cougar
88 T-Bird
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Climate controls stuck on defrost

Reply #7 –
Quote from: Moonmount;462172
i looked at it a bit more and it was a massive vacuum leak at the vacuum ball thing you got one of those?

I'm sure that I do. Gotta locate it  on my parts car though. If I remember correctly, it's under the passenger fender. The system is working fine though, so it has to be a good part. Give me a few days to get to it.

Climate controls stuck on defrost

Reply #8 –
Quote from: 50RACER;462203
I'm sure that I do. Gotta locate it  on my parts car though. If I remember correctly, it's under the passenger fender. The system is working fine though, so it has to be a good part. Give me a few days to get to it.

thanks man and yeah the car even runs better now :/
88 Cougar
88 T-Bird
other cars that don't apply to this forum