a/c cuts out
07-19-2011, 09:21 AM
#1
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Join Date: Jan 2011
Location: Cedar Park, Texas
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a/c cuts out
So my a/c will be blowing fine when idling and then as I accelerate it will cut out and bearly blow on the floor vents. Once im done accelerating and just cruising it goes back to to normal. Im thinking its something to do with vacuum tubes but I don't really know where to start. Any suggestions?
07-19-2011, 09:49 AM
#2
It's not the "air conditioning", it's the vents (just to clarify). This is common on the n/a models. The vent doors use vacuum from the intake manifold to open. When you full throttle the car, there is no vacuum in the intake, thus making the vent system go to default... floor & defrost.
The only way to fix this is to install a vacuum pump like the turbo model or bigger vacuum reservoir.
The only way to fix this is to install a vacuum pump like the turbo model or bigger vacuum reservoir.
07-19-2011, 12:00 PM
#4
In that case, I imagine the vacuum pump / reservoir has been bypassed... Just follow the vacuum lines that come out of the firewall below the a/c refrigerant lines. They should go to the pump by the hood light (behind right headlight). If it goes to the intake manifold, you found the problem.
07-19-2011, 12:33 PM
#5
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Location: Cedar Park, Texas
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So I took a look and found one line that comes out of the firewall and goes to a pump and then there's a pump right next to it and another lines goes to the manifold. It looks like this...
*red goes to the manifold and blue goes to the firewall.*
*red goes to the manifold and blue goes to the firewall.*
07-19-2011, 01:47 PM
#12
Grumpy & Helpful
Join Date: Sep 2006
Location: Mill Creek WA
Posts: 1,415
no but the switch that controls the vac pump could be bad. you should hear the vac pump start and run when you turn the ignitiion to run position. be sure the tubing isn't so old that it is split or somehow defective.
07-19-2011, 02:06 PM
#13
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Location: Cedar Park, Texas
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I can feel suction when the car is on but I can't hear them or anything when I just turn the key. And the tubes look fine, from the outside atleast haven't checked the ones inside yet.
07-19-2011, 05:00 PM
#14
Mr Z++ Wiki
Join Date: Sep 2009
Location: Victoria, BC
Posts: 2,195
Pull the tubes out and cut the first quarter of an inch off then put it back on. The line gets old and hard and stays stretched out. If you cut that first hardened piece of you'll make a better seal. It sounds like you are loosing vacuum along the way. I just rebuilt my entire climate control and I cut every single fitting including the butt splices back a quarter. I had to add an extra section coming in from the engine bay to the main vent unit because there wasn't enough slack to cut a quarter of an inch off every piece.
I had a leak at the pump as well and it was a quick fix by taking the first quarter of an inch of the vacuum line then putting it back on for a good seal. There are two vacuum lines going back - one for the idle speed control and one directly to the AC unit. Check the vacuum diagram on page HA-71 on the '83 diagram from www.xenonS130.com
I had a leak at the pump as well and it was a quick fix by taking the first quarter of an inch of the vacuum line then putting it back on for a good seal. There are two vacuum lines going back - one for the idle speed control and one directly to the AC unit. Check the vacuum diagram on page HA-71 on the '83 diagram from www.xenonS130.com
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