Originally Posted by masher
The AC was working fine, and cold, in my 2003 Bonneville. I didn't use it for a week or so and now it blows no cold air at all. How to I tell if the clutch on the pulley is engaged and the condensor is running?? The AC lines under the hood, near the fuse panel, are freezing cold on one side and warm on the other. It doesn't seem like its circulating. Anything I can check??
With the blower on a higher speed and the engine running, feel the tubes at the firewall. One should be cold and the other should be warmer but still cold after the freon has expanded and absorbed heat from the air.
If you're low on freon, the outcoming freon will be much warmer than normal. In these cars it'* the passenger side of the internal air flow that gets the freon first, so the passenger gets more cooling than the driver.
Because you say the freon near the expansion tube (in the connection at the accumulator tank and fuse box) is really cold, that probably means you are low on freon. It should be full enough that after passing the expansion valve it doesn't really expand completely until it'* into the evaporator core.