Heater control valve - 71 pickup
 

Got my ac vacuum control switch working today. Also, got the vacuum hoses hooked up. I noticed when I moved everthing to heat, the control valve would leak. Does this indicate a bad control valve or is something hooked up wrong?

Re: Heater control valve - 71 pickup
 

i havent seen one leak, well the hose running to it, but not the valve its self. sure couldnt hurt to replace it though, they are not very expensive.

Re: Heater control valve - 71 pickup
 

Is it a new valve or old one you might have some debris in it not letting it seat right.What size of vacum hose did you use?

Re: Heater control valve - 71 pickup
 

It's an old valve. Debris did cross my mind. Guess I'll have to check. I used the normal sized small hose for vacuum. Sam size as what connects to the control panel in truck.