Question about 2004 Chevrolet TrailBlazer

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My air conditioning only works on high, all other levels do not work. what is wrong and what part do I need?

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I am assuming that we are talking about the blower motor... if so I would recomend replacing the blower resistor. it is on the passenger side under dash held in with 2 screws.

Posted on Jul 08, 2010

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You'd need to check in the car's manual to find out where that is, it's different in every car.

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Typically when the blower only works on high it is because the blower motor resistor is faulty. The first thing I would do is have it checked or replaced and see if your lights are still not working right.

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Need clarification...
Does the compressor run steady, cycle on and off continually or even come on at all? If cycles on-off then attach charge manifold/gauge set and bring freon up to proper level. If does not come on at all, then start engine, turn a/c on, remove two-wire plug from low pressure cut-out switch mounted on accumulator. Jumper the wires at plug and see if compressor comes on. If so, bring freon up to proper level.

If charge level was low then check for system leak after system charge with an electronic leak detector if available.

If compressor runs but doesn't cool vehicle then with engine running and a/c on feel (carefully) the lines. High side line should be hot (be careful) and low side line should be cold. If these are both true then it's possible non-cooling condition is due to air temp diverter door not operating or heater valve not shutting off (if so equipped). If low side not cold it could be a plugged orifice tube. If high side not hot it could be bad rings on compressor. Both conditions can be diagnosed with a/c manifold gauge set by noting the pressures.

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Sounds like your freon has leaked out and your heater blower resistor is burned out. Deffinitly take this to the dealer.

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