Heater will not cut off??

BarryBum · Post by **BarryBum** » Sun Jun 08, 2008 2:21 pm

My heater on my 71 will not cut off. It is an a/c car and I have it off on the controller. But I still feel heat coming through the vents..........how do I stop this or bypass it????? Please help, its HOT enough without the heater blowing all the time....................

Smellslike1974 · Post by **Smellslike1974** » Sun Jun 08, 2008 2:26 pm

If you dont want it on at all for now,Cant you just unplug it from the fire-wall module?And when you can get it fixed.

BarryBum · Post by **BarryBum** » Sun Jun 08, 2008 2:32 pm

or I could bypass it at the water pump, but I was wondering if there is a door somewhere that may not be closing via a vacuum leak or something.

Smellslike1974 · Post by **Smellslike1974** » Sun Jun 08, 2008 2:36 pm

yeah maybe its just the fan,not necessarily the heater itself,maybe the fans just blowing already hot air.

landon1 · Post by **landon1** » Sun Jun 08, 2008 2:39 pm

i feel your pain...when i first was able to drive my car (6 months after i got it, so around my b-day in december), the heat didn't work at all...now, in the winter/cold weather, i take the 2 hoses and hook them together via a pipe, so that i have heat, then disconnect them when it's warm...my car had a/c originally, plus an aftermarket heater valve, but idk what to do to it yet...when i get to an actual resto, a compelete AC system is going in, so i'm ok with hookin up the hoses in october and un-hooking them in april or so.......you could do it the better and easier way by installing a hand-controlled valve under the hood...i thnk that even doing it my way, you can still feel a lil bit of heat coming through, though.

fourforty6pac · Post by **fourforty6pac** » Sun Jun 08, 2008 2:39 pm

It's you temp control valve. It is on the right side of your fire wall. There should be a vacuum hose hooked to it. It controls the amount of hot water that goes through the heater core. You could by pass it, but then you would have no heat if it was needed. They are not too hard to find. The cost ranges from 50 to 150 for a nos unit. These things are different for each year. 71's are vacuum 72's are operated with a cable. 73 and 74 are also cable operated but are different from the 72's. If your not interested in keeping it factory you could buy a replacement at any auto parts store.

landon1 · Post by **landon1** » Sun Jun 08, 2008 2:41 pm

here's my reply to that....where's the vacuum hose that goes to it? i have one loose vacuum hose, dunno where it came from, but when i hooked it up, it didn't do anything...maybe replace the valve AND hook-up that hose???

fourforty6pac · Post by **fourforty6pac** » Sun Jun 08, 2008 2:45 pm

Here's what you need.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... 28981&rd=1

landon1 · Post by **landon1** » Sun Jun 08, 2008 2:46 pm

so where does the vacuum hose come from, so maybe i can trace it on mine?

rr6pak · Post by **rr6pak** » Sun Jun 08, 2008 4:29 pm

The vacuum hose comes from the vacuumcan, which is under the battery box

landon1 · Post by **landon1** » Sun Jun 08, 2008 5:01 pm

yep, don't have that either