I have a 69 Skylark and it’s making popping noises on the passenger side heater box. I’ve had this issue for a couple years now, it doesn’t occur all the just occasionally. This morning while driving to work in traffic it starts popping, so I turn the heater on (it’s almost 90 degrees here)and it stopped? Any ideas or suggestions?
It’s popping, it doesn’t matter if the car is moving or not. This morning is the first time I turned the heat on while it was popping. I’m thinking maybe the vacuum diaphragm, I’ve never had one go out or had issues so I don’t know any symptoms it would produce.
If it sounds like an electrical popping noise, it might be the blower resistor? Perhaps it's arcing? That is on the engine compartment side, but who knows?
It’s not electrical, it sounds like something maybe closing and keep popping back open again. If you hit the heater box with a screwdriver will come close to the sound it makes. If it does it when I get home I’ll unplug the vacuum and see what happens. It’s an A/C car however I took the evap out and A/C delete cover was installed Thanks for the replies fellows Jaye