Heater

[Garagetoyz]

My 78 has a strange problem. It seems to blow hot air out of the vents all the time and in the summer, that air is baking hot. I try to keep it on defrost to divert the heat but maybe its time I try to do something about it. Even if the switch is off it still does this, I had the heater control replaced last year but no luck. Maybe its a vacuum leak but I dont see (or hear) any and I replaced the hose from the firewall to the valve in the fenderwell. Now that I have the new headers on I want to drive! Maybe the heater bypass valve will help? Bah I'd like to yank the blower motor wire at this point..Any tips would be great,

 

[bobs78]

There is an adjustment to the temp control cable that goes from the dash lever to the heated/fresh air diverter on the plenum. Its located under the console on the pass side. After you remove the carpeted side cover you'll see the black cable housing and a white plastic piece. You can turn the white plastic piece to adjust the cable length so the diverter closes fully.

 

[Bob Chadwick]

I've got some information on my web site about how the vent system works.

 

[Garagetoyz]

Thanks guys, great information! . Now I can drive with my sneakers on Honestly what a great webpage for this problem

 

[thesurvivor]

Great site! My '73 has no controlled shut off valve, and we were turning red driving around on a nice - not hot - day. A manual shutoff valve in the heater line made a huge difference. But I need to do many of the things you've already accomplished. Thanks!