Guys,
Yesterday was a hot day and I tried to turn on the AC... Damn, it started blowing HOT air and I had a 4 hour trip on a HW with all the windows open and my kids complaining...
There is a beginning to this story: in the autumn I was trying to fix my not working odometer and replaced a cluster, then put the old one back. Ever since then my ambient temperature indicator showed -30°C. Plus I removed the battery trying to reach the hose that supplies gas to the rail, so there was some digging in the battery area too.
So, today I did some investigation and found that if I set temp to 18° and put into auto or econ, it blows slowly cool air. If I increase the temp, it turns on the heat. I tried to breath onto the temp sensor just to the left of the radio and the thing seemed to react by changing the speed and direction of hot air.
This makes me think that the signal from the ambient temperature sensor is not reaching the AC/heater computer, which in turn thinks it is freazing cold outside and tries to keep me warm and fussy.

Where is the ambient temperature sensor located?
Do I make sense?
Is this a well known problem that has a solution?

Thank you all!

 

I think the sensor is right by the hood latch. I could be wrong.
Rich

 

Found it! It had the wires completely torn away. A little black plastic box full of rubber compound with a sensor inside.

Your help is appreciated!

 

yeah, i kinda have the same problem, except when i hit the off button on the digital dash AC, it goes to defrost mode and starts blowing either heat or outside air in at full blast.....any idears?

 

swap in a full manual setup,
Awsm66 (without his 66 :P ) should have a spare setup

 

Ok, with the help of the forum it was done. I picked all the rubber from the plastic box, soldered the harness back to the wires that still remained on the resistor and voila, it works! My mechanic was going to sell me the whole AC control unit for a few hundred bucks
The only part that required brains was to recreate the tab on the bottom of that box, tie the harness to it and fill the box with silicon caulk.
The downside is that when I was removing the bolt that attaches the middle of the very bottom part of the bumper to the chassis to gain access to the bolt that attaches the bottom of that post that has the latch and horns on it, the head broke and I expect some rattle on the front. This is easy to fix though.

Huh, you guys made my day! Thank you Rich!!!

 

hi, i have the exact problem only opposite, it blows cold air when its on hott, and cold air when its on cold. Any one know what i should do?

 

Mine (which I thought was working perfectly when it was cold out) is doing the same as Tarzan first explained - blowing hot air when the temp is set to 18 celcius..........buuuuuuuut, my ambient temp reading is correct all of a sudden??!