Is there a website with detailed info, pictures and tips for troubleshooting and fixing the blower/heater system - especially inside cabin, underneath dash - of a ' 77 280z ? Here are a few things, among others, I would like to know :

1) In my 77 280z, the blower heats all the time, even when set to cool, unless I put it on '' vent '' or AC. If that is not normal, witch I' m pretty sure of, what and where should I look at ? I have been told that there is a valve INSIDE the car that controls the prestone into the heater core. Is that true ?

2) There is a prestone smell inside the car when the engine is running, like if something was evaporating or slightly leaking somewhere into the blower system. Could it come from anything besides the heater core ? Once again, is there a valve inside the car that could be leaking ? Is there a way of changing the heater core in these cars without tearing apart too much stuff ?

Thanks.

 

I have the same problem with my 78. If the outside temp is below 77 degrees I do get cold air otherwise all i get is hot out of every vent except the pull round vents. In contrast my 81 does not have this problem.

Friends dont let friends drive anything but a Z.