I have no heat out in car. A/C for fine, fan works fine. I'm going to check the thermostat and see if ones even in it!!!
But if so I have a valve that is vacuumed controlled coming out of the block to one heater hose. Are those common problems? I'm thinking of by-passing it for now and see if that works
Ideas?:dontknow:
Oh yea, 78 with a aftermarket 350
Donny

I have no heat out in car. A/C for fine, fan works fine. I'm going to check the thermostat and see if ones even in it!!!
But if so I have a valve that is vacuumed controlled coming out of the block to one heater hose. Are those common problems? I'm thinking of by-passing it for now and see if that works
Ideas?:dontknow:
Oh yea, 78 with a aftermarket 350
Donny

I had to replace my nice metal vaccum one and like everything else the new one was plastic. I'm on my third plastic one.:dontknow::dontknow::texas:

imagine this....I know one of the tricks here!!

Get a heater control valve for 61-63 olds or Cadillac. they are lever action mechanical, but you can do that by hand. Thing is, most of them were brass, and last forever!!! They still mount in the heater hose, and were originally cable operated. Block off the vacumn source for your stock one, and flip it open/closed by hand. 67-72 chev/gmc C10/20 truck ones are also lever, but steel, not brass.

imagine this....I know one of the tricks here!!

Get a heater control valve for 61-63 olds or Cadillac. they are lever action mechanical, but you can do that by hand. Thing is, most of them were brass, and last forever!!! They still mount in the heater hose, and were originally cable operated. Block off the vacumn source for your stock one, and flip it open/closed by hand. 67-72 chev/gmc C10/20 truck ones are also lever, but steel, not brass.
I saw that here was that yours with a valve on each hose?

I have no heat out in car. A/C for fine, fan works fine. I'm going to check the thermostat and see if ones even in it!!!
But if so I have a valve that is vacuumed controlled coming out of the block to one heater hose. Are those common problems? I'm thinking of by-passing it for now and see if that works
Ideas?:dontknow:
Oh yea, 78 with a aftermarket 350
Donny


Donny, check to be sure that you don't have constant vacuum going to the valve. Some PO's will run a vacuum line straight from the manifold. Vacuum for this control needs to come from the HVAC control. When vacuum is applied to the valve, it shuts. No vacuum is open. Only time it should have vacuum is when the AC is on MAX at full COOL.

No vaccum line on it all all? Should be open?
Donny

Donny, no vac is OPEN. You can take it off to see if water will run thru under some running water. Dale

10-4
Donny

I saw that here was that yours with a valve on each hose?


no, not mine, but that would be redundant double redundancy.

:poke: