Stuck on Defrost
#1
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Stuck on Defrost
My brother-in-law just bought a 92 Bonneville and he can only get air through the defrosters. He says he has vacuum at the ports under the dash. I suspect a control door is stuck - any suggestions?
#2
Senior Member
Certified Car Nut
Billboost will testify to my favorite suggestion:
Look for a vacuum line going into the firewall to the left of the brake master cylinder. There should be a black box there with a vacuum line running from it to the TB area. That one supplied vacuum to the HVAC system.
Look for a vacuum line going into the firewall to the left of the brake master cylinder. There should be a black box there with a vacuum line running from it to the TB area. That one supplied vacuum to the HVAC system.
#7
DINOSAURUS BOOSTUS
Expert Gearhead
There are 3-5 valves which I've never gotten into. Unfortunately I don't think most of them can be accessed w/o pulling the dash. Although..the dash is an easy thing to pull.
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