heating
#2
RE: heating
Sounds like it's time to replace the check valves in the vacuum lines. Should be one at the brake booster (vacuum brakes), and one along the firewall. I would replace both of them first before digging in any further. The vacuum line for the selector control enters through the firewal near the a/c & heater core lines. Hard black platic line about 3/16" thick. Then changes over to a softer rubber line when it enter the cab.
The check valves are like 2-3 dollars each, usually.
Hope this helps.
Good luck with your ride.
The check valves are like 2-3 dollars each, usually.
Hope this helps.
Good luck with your ride.