Mercury Mountaineer
Honda Accord LX
Chevy Trailblazer
Heating Ventilating and Air Conditioning

2000 Mountaineer you turn on the air conditioner and it blows hot air If you just turn it on vent it still blows hot air although you have the thermostat set on 60 The compressor turns?

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01/30/2011

Answer

Try recharging the whole system. If you don't want to do it yourself, you can usually find somewhere to do it cheap.

Answer

You need to determine whether you have a slow leak or a large (fast) leak. You can have your system tested at the dealer or a shop that specializes in air conditioning systems (usually cheaper). If it's a slow leak that they can't find, go ahead and get it recharged and see how long it takes to run out again. If it's a fast leak, you're probably going to have to have all your seals replaced. The last time I did it in a '98 Explorer, it was a little over $400.

Answer

Check if your AC system has good pressure. If yes, most probably you have a default blender door actuator. Push FLR/PNL and OFF button at the same time and within 2 seconds push Auto on the AC panel, the system starts to diagnose. If you get error code, clear the code by pressing Defrost. I had the same problem once, bought a new blender door actuator from a Ford dealer for ~$60, spent about an hour to take out the old one and put in the new one. Clear the error code and it starts to blow cold air. There are videos on youtube showing how to install the actuator.