Question about 2000 Chevrolet Silverado

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2000 silverado a/c only works on high fan speed. Blows ice cold. But lowering fan speed, or adding heat to adjust temperature causes compressor to cut out.

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Hi! The blower resistor is the culprit here,located on passenger side of vehicle under glove box area. I have replaced several of these for the same problem. You also need to check the connector for the resistor for heat damage to terminals and replace as needed. The harness will come with wiring attatched and heat shrink **** splice sleeves. hope you find this information useful!

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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The "fan clutch" does not engaged/disengage. The fan speeds up or slows down depending on the temperature of the air blowing through the condenser/radiator.

If the AC compressor clutch is cycling on and off, that is what it is supposed to do, responding to the pressure sensors, one on the accumulator and the other on compressor high-side circuit. If it is cycling too much, then there is a problem elsewhere in the system.

If the airflow through the condenser/radiator is restricted, on the high side gauge, pressure will be elevated, especially as the engine speed increases.

The compressor, mounted on the bottom of the engine, has a high mortality rate. The reed valves inside them break. If the compressor throws belts, and the belt and tensioner are good, that is the sign of a bad compressor.

As a rule of thumb test, if the freon system is working correctly, with the system full, the accumulator should be cold to the touch. The small liquid line between the expansion orifice and the firewall should be ever colder. Pressure readings on the gauges is pretty close to the actual tempts of the compressor outlet and the evaporator.

Check to make sure that your fresh air intake is not plugged.

Since 1988, full-size Chevy trucks used electric stepper motors for flap control inside the dash. Temperature control is achieved through the flapper door between the heater core and evaporator. A door that is not in the position which it is supposed to be will cause incorrect temperature at the outlets.
When you shut the ignition off, the stepper motors continue to run moving the flapper doors to their default max heat/defrost positions. You should be able to hear then buzzing. If you hear a clicking or stripping sound, then the stepper motors are bad and not moving the flapper doors correctly.

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Sounds like you didn't add oil , when freon goes the oil goes also. When you say locked up , you mean the compressor won't turn when the clutch engages? Either too much freon or the oil was gone from the system when you put freon in it.

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The AC on my 2002 chevy S 10 just suddenly stopped blowing cold air. The freon is full and the compressor is coming on. Any advice would be helpful in this Texas heat. Thanks


If the freon is full and the compressor clutch is working,is the blower working, need more details, if it is, you could have a blocked orifice filter. or a bad high pressure switch located at the rear of the compressor.if the high pressure switch loses voltage or goes out, your cool air will come to a dead halt. check the high pressure switch for voltage. good luck!

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My 2000 yukon xl air conditioner blows hot air in the rear and in the front at a idle


First, I would check that the a/c compressor is on at idle.
Then, I would check that the fan goes on.
After, that I would check that the plumbing is getting cold on the low side. If it is not, then I would look for causes for that, including but not limited to the r134a refrigerant pressure being too low.

It should read 25 psi to 45 psi on the low side when the a/c compressor is turning, which is normal.

If it reads 75 psi to 100 psi or higher and the a/c compressor is not turning, then there is a problem.

The a/c compressor could be wearing out (its pistons that is) and causing the pressure to not be high enough at idle speed.

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The fan in my truck only turns on on high speed.


A bad blower motor resistor will cause it. It is located ny the blower motor p.s. below dash.

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I have a 2002 Ford Mustang. My air conditioner is not working properly. It blows into the defrost when I take off and when I let off and go a steady speed it blows out cold. It blows hot air sitting at...


if it never comes out face vents then u have a door actuator motor not working ,,if it jumps around letting off throttle then it is a vacuum problem vacuum under hood going into the firewall needs to be checked,,and vacuum resovoir might have hole in it if it is vacuum cantrol,,,the reason for warm and cald temp changes is probley not enough air flow threw radiator and condenser this will rise the high side and low side heating up the freon and it cant cool the freon down enogh to get col air ,electic fan not coming on would cause this or fan clutch (if it has one ) would also cause this .look for fan relay not working ,also did u change accumilator and dryer? ,also may have blockage in condenser i hope i shed some light on the problem

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I think u may have an air temperature control blend door problem, the door is moved by a small electric motor, it is stuck in the cold position.

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You have a problem with the outlet air temperature control blend door or the motor that actuates it.

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