Northcoast300h
Active Member
1970 300 Hurst with 440 auto. Saved from junkyard. Dash and firewall was rotted, but I got almost everything to work. When I bought it over a decade ago, heater/ac buttons were stuck, so I kept pushing/lubing them until they operated smoothly again. In the last few months, I haven't heard the "pssshhhhh" sound anymore when I go from "off" to push in the "heat" button, although fan blows hot air. My A/C has never worked but I noticed it blows hot air too. Around the same time, I disconnected and plugged the vacuum hoses to the fan door since it was rotted and I would rather have it open to interior all the time anyhow. These aren't connected in anyway to the heater valve, are they? None of the vent doors work due to rot, so heat comes mostly out of the A/C vents, with a little at defrost and at floor.
I traced and inspected heater valve vacuum hose all the way back to under the heater/ac controls but can't see anything due to the huge 8 track in the way. There doesn't seem to be any leaks but not sure. I can't hear air escaping and I'm pulling 18-20 of vacuum at carb.
So what part went bad? I'm thinking of just installing a manual turn valve instead of the heater control vacuum valve. I know I'll have to go under the hood and close the manual valve every time I want to use A/C (once I fix the A/C), but I don't want to take the whole dash off just to fix this. Thanks for your help.
I traced and inspected heater valve vacuum hose all the way back to under the heater/ac controls but can't see anything due to the huge 8 track in the way. There doesn't seem to be any leaks but not sure. I can't hear air escaping and I'm pulling 18-20 of vacuum at carb.
So what part went bad? I'm thinking of just installing a manual turn valve instead of the heater control vacuum valve. I know I'll have to go under the hood and close the manual valve every time I want to use A/C (once I fix the A/C), but I don't want to take the whole dash off just to fix this. Thanks for your help.