I am having an intermittent problem with the air conditioning on my
96' Lesabre. When the A/C is on (max, normal or bi-level), occasionally the vents will switch to defrost mode and get stuck there. Usually switching from heater to a/c max a few times resolves the problem (temporarily), but sometimes I have to shut the engine off to get the proper airflow again. It does not happen all the time, but usually every 3rd day or so.I notice it usually happens when coasting, a few seconds after I remove my foot from the gas. This migh just be cooincedence, but I thought I would mention it.
I recently had to replace a bit of rubber hose for the evap emissions solenoid, it had rotted and cracked. I am thinking the same problem might exist for the vacuum feed to the vent control, but cant seem to find where it connects to the engine.
thanks