A/C takes 10 min. to blow from the dash vents - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-10-2007, 02:25 AM   #1
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Default A/C takes 10 min. to blow from the dash vents

This seems like a weird one... couldn't find much when searching the 92-99 forums...

Just got back from a 10 day vacation. The HVAC worked fine when I left, but now the car has an issue blowing air from the panel vents. No matter what setting I choose on the ECC (manual or auto) the air only blows from the defrost and floor vents. But if I keep driving for a solid 10 minutes or more, the air flow gradually begins blowing out the panel vents harder and harder until it seems like it'* back to normal. The only catch is that if I shut the car off it resets itself and the problem occurs all over again. I would think this rules out a vacuum line since the panel vents are fully capable of working, but I can't say for sure.

All I did was leave the car parked for about 10 days... maybe she'* just jealous that I was in Iowa driving my dad'* white '02 for the week?
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Old 07-10-2007, 08:42 AM   #2
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Ben..

You need to circumvent your collapsed nipples. Call Bob..promise beer and comradery, buy the vacuum line size he tells you and it'll be fixed right up.

http://www.bonnevilleclub.com/forum/...ght=hvac+vents

IIRC the link to the fix etc is on page 6
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Old 07-10-2007, 09:44 AM   #3
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Default Re: A/C takes 10 min. to blow from the dash vents

Quote:
Originally Posted by big_news_1
This seems like a weird one... couldn't find much when searching the 92-99 forums...

Just got back from a 10 day vacation. The HVAC worked fine when I left, but now the car has an issue blowing air from the panel vents. No matter what setting I choose on the ECC (manual or auto) the air only blows from the defrost and floor vents. But if I keep driving for a solid 10 minutes or more, the air flow gradually begins blowing out the panel vents harder and harder until it seems like it'* back to normal. The only catch is that if I shut the car off it resets itself and the problem occurs all over again. I would think this rules out a vacuum line since the panel vents are fully capable of working, but I can't say for sure.

All I did was leave the car parked for about 10 days... maybe she'* just jealous that I was in Iowa driving my dad'* white '02 for the week?
I have posted the imcool.com link for bypassing the rubbery plastic connector where the collapsing black nipples are that seem to block the vacuum flow before and I did it myself on my 98. I also had someone for whom I posted that link say they got the plastic connector apart and punched through the nipple-like black plastic and opened up the passage. I was told by the dealer that the plastic components are hard to get apart with ripping or damaging them after all these years of heat. But he got them apart. I think it'* easier just to take out the connector and replace it with the pieces of 1/8 inch internal diameter gas line hose. I slipped them on with a little water for lube connecting the internal plastic lines with the external. Note the internals are different colors than the externals. I made a list before I cut them apart of which color went with which.

First I went under the dash and disconnected two lines at the vacuum motors and put a different one on the AC dash vent door. I switched through the settings until one activated the motor. It moved quickly and easily with vacuum applied so I knew it was a problem with the vacuum line for the dash vent.
http://www.imcool.com/articles/airco...acuum_line.htm
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Old 07-10-2007, 11:31 AM   #4
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Thanks for the response, guys. I'll probably give Bob a call and see what he'* doing later this week, as I would like to get this issue fixed. Isn't it a bit odd that a problem like this would occur after the car had done nothing but sit in a parking lot for a week? That'* what I don't understand...
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Old 07-10-2007, 12:40 PM   #5
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There'* many factors Ben..

It'* sort of like..why did your trunk that was fine for years finally crack?
Why does a tire suddenly pop with no reason?

It'* simply the time for it to fail.
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