A/C & heater control vacuum line info

WBOWERS

WBOWERS

Not-quite-so-new-guy
Mar 7, 2018
25
3
Wayne, Michigan
I've just gotten done doing all this too. I changed all terminal ends in connectors. added dilectric grease
to all connections. New blower, relay, resistor and switch inside. still no high speed. But thanks to all the great responses
i will now go double check the red wire to see if it is a good connection at starter. Thanks to all who help us figure things
out. Now to see if i should trade my 76' 250 6 cyl for a 350 2 bolt short block 86-94.... decisions decisions
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,666
113
Des Moines, Iowa
The wire goes to the blower relay correct?
from the starter to the relay from what I remember. its direct battery power, full 12v. If it's at the relay, follow it. if not, find it at the starter. if not, maybe someone can show ya a pic of theirs. my car was a V6, so i think it'd be different.
 
Roddarius

Roddarius

Not-quite-so-new-guy
Jan 23, 2011
26
3
Louisiana
from the starter to the relay from what I remember. its direct battery power, full 12v. If it's at the relay, follow it. if not, find it at the starter. if not, maybe someone can show ya a pic of theirs. my car was a V6, so i think it'd be different.
Thank so much
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,666
113
Des Moines, Iowa
Finally, found this thread again. Was looking for that vacuum selector switch.
For future refference, here's the AC DELCO part number for it: 15-71389. Advance Auto #: 36694 Napa: TEM207709
 
69hurstolds

69hurstolds

Royal Smart Person
Jan 2, 2006
2,085
113
Finally, found this thread again. Was looking for that vacuum selector switch.
For future refference, here's the AC DELCO part number for it: 15-71389. Advance Auto #: 36694 Napa: TEM207709
Good detective work. However, be advised, there are some folks on ebay selling them in bulk at around $50-60 or so WITHOUT a box/baggie (while claiming they're original Delco parts), which is typical price of an actual Delco part. GM retail is $123.60. But you can buy a 36694 at Advance for around $29. NAPA price is $25.49.

I can't imagine these being manufactured by more than one or two places, so it's very possible they could be the exact same part. Not sure. If they are essentially the same part from the same manufacturer that makes all of them, great prices at NAPA to be sure. But if they're not...buyer beware. Just saying.
 
Gonzo1970

Gonzo1970

Master Mechanic
Supporting Member
Sep 30, 2018
481
93
Thanks for this thread... I can hear mine leaking, and its stuck on Defrost. Took out the radio and looked at this while it was out. I put my finger on it and yeah, you can hear the hissing change when I move my finger around the vacuum selector switch.. Sounds to me like the vaccum selector switch is bad. Got one on the way from Napa.. $27.

Can't wait!!

-Gonz
 
Longroof79

Longroof79

Geezer
Oct 14, 2008
9,984
113
Gainesville, Fl
One of our fellow members (UNGN) suggested using a small nut and bolt thru where the selector lever is attached. Apparently it tightens up the connection which helps eliminate, or decreases vacuum loss.
I thought that was a useful tip.
 
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