First Corvette.. need some help
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Cruising
Joined: Apr 2014
Posts: 12
Likes: 1
First Corvette.. need some help
I recently just bought an 85 Corvette and I love the car! However, it has a few minor issues, primarily with the A/C system (manual system). There seems to be a lack of airflow which I assume can be credited to a clogged evaporator which I will work on cleaning out. Next, all the time my air is directed out of all the vents (floor, mid level, and defrost) even if it is on the defrost setting (I'm guessing a vacuum issue but I don't know where to start on that and can use advice). Thanks in advance!
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
You have to verify getting vacuum to the control head. Lack of vacuum will cause the system to go into default mode...which will cause the air to come out on the floor and defrost.
There is a small special check valve that has the hose from the interior HVAC system connected to it. IF this check valve is bad or missing and some has installed a vacuum"T" fitting...there is past of your problem.
The black plastic round vacuum ball in front of your drivers side front tire is the storage container for your vacuum system. Follow the hose back from it and it will "T" into your cruise control...and keep following the hose and that is where you will find the check valve.
If I am not mistaken...the hard black plastic tubing for your HVAC system comes out of the firewall behind the passenger valve cover and it may route down by the starter and then come back up to the area by your wiper motor. I have had the hard plastic tubing being burnt or broken by the starter before.
DUB
There is a small special check valve that has the hose from the interior HVAC system connected to it. IF this check valve is bad or missing and some has installed a vacuum"T" fitting...there is past of your problem.
The black plastic round vacuum ball in front of your drivers side front tire is the storage container for your vacuum system. Follow the hose back from it and it will "T" into your cruise control...and keep following the hose and that is where you will find the check valve.
If I am not mistaken...the hard black plastic tubing for your HVAC system comes out of the firewall behind the passenger valve cover and it may route down by the starter and then come back up to the area by your wiper motor. I have had the hard plastic tubing being burnt or broken by the starter before.
DUB
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
