Hello, I have a 1993 Bonneville se, It has 135 miles all summer A/c worked fine and was blowing even. Well it'* cold now and the passenger side vents blow hot!! the drivers side blows cold, even on defrost the passenger side is hot!! air comes out on the Driversr side but it'* cold. antifreeze is fine blower is new can anyone one help??? also I dont have climate control just standard 2 dial a/c heat dial and blower speed.

thanks Ron.

Sounds like a busted mix door (stuck) or a vacuum line is disconnected/cut. The airmix door is vacuum actuated. It'* buried under the dash on the passenger side.

thanks I will work on that Today appreciate the reply.


Ron

Ok checked mixing door and all the vacuum hoses, all doors operating correctly. I did find though the upper part of the coil on the heater core was hot and the lower Ice cold ?? any suggestions sounds like a plugged heater core?? or is their something else going on with it.

thanks a lot for your help

Ron