I have heat! Removed the dash cover, glove box and passenger side vent ducting then adjusted the blend door into the full hot position. I then put a socket between the bracket and rod on the recirc valve in the engine bay so it's stuck open. Its cookin' hot in there now! Thanks for all the help...
Thanks for the helpful replies! I haven't had time to tear into the dash with work this week but will try on the weekend, I did do an oil change though and located the block heater cord which is just missing the end. I also noticed there is no vacuum to the grey line that connects to the valve...
Verified the temperature slider on the climate control unit is good, I have hot hoses going in and out of the heater core, there is no discernable noise difference when switching from cold to hot with the slider so I am guessing the blend door is seized? Where exactly is that located and can it...
Thanks for the reply, I had another listen and the hissing noise wasn't coming from the unit itself, so I began manipulating the vacuum hoses and even though that green one appeared intact I could change the hissing. I bypassed the connector with vacuum hose and there is no more hissing.
I...
Pulled the radio and climate control module, solved my speaker concern. For the climate control, if I plug the vacuum lines with my thumb there is no hissing, but when I connect it to the module it does, should I disassemble the module?
1988 5th Avenue just bought today. Runs good but has constant hissing noise from dash (assuming climate control), speakers just screech loudly when turned on/up and I can't seem to get any heat from the vents.