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Have a 95 formula lt1 m6 that has a lt4 hotcam and loss air out the vents. It has defaulted to defrost from what ive been reading. The air pump also has been deleted as well. Any one know where the vacuum lines run to and from for the chwck valve that is right next to the pcm?https://uploads.tapatalk-cdn.com/201...da6e3ca127.jpg
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Double post.
The easiest thing to do to restore air to your vents is to run a new vacuum line to the t-fitting near the pcm. If you take out the glove box you should be able to find the black hose going to the hvac controls. That is the vacuum line. You can run the new line through the wire harness grommet on the passenger side under the pcm. It takes no time to do and is very cheap or free if you have some line laying around.
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Do you have pictures as to where to run the line
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The "tee fitting" is the check valve. Very common for them to break. There is a line from a nipple on the passenger side of the intake manifold (right next to the nipple for the fuel pressure vacuum line) to the check valve. On the other side of the check valve, one line runs forward to the small vacuum tank in the front fender near the horns. The second line runs thru the big grommet behind the PCM to the HVAC control panel.
All images courtesy of Shoebox
http://shbox.com/1/hvac_vacuum.jpg
Nipple in right hand photo without anything connected is for HVAC vacuum
http://shbox.com/1/fp_reg.jpg
Vacuum check valve
http://shbox.com/1/vac_check_valve.jpg
Vacuum tank
http://shbox.com/1/vacuum_tank.jpg
http://shbox.com/1/vac_tank.jpg
Is the black round thing behind the glove box where the vacuum line from the check valve comes in go into this?
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Hope this helps OP but I helped me I have 2 vacuum lines I didn't know where they went but I do now thanks alot
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