Question about 2003 Chevrolet TrailBlazer

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2003 Trailblazer ac fan only works on 3 or 4 speed. Also if sounds like my clutch fan is beginning to sound like it is engaged most of the time. AC rear works and front and back blow cold air. All front vents are operating fine.

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Replace blower motor resister

Posted on Sep 01, 2010

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Hi My AC do not work on the dash board in also at speed 5 it stop working can you help me with this thinks

Posted on Oct 08, 2010

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1 Answer

2000 Dodge Durango


The compressor is going out. The only time the compressor actually runs is when the clutch is engaged, the rest of the time the pulley acts as an idler pulley and just free wheels. I would suggest replacing the compressor and the accumulator.

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Screaming noise from ac no cold air


It sounds to me that your belt or tensioner is worn, if the noise goes away when the ac is off then it is just the belt slipping, it takes a lot of power to run the compressor and if the belt is worn it most likely slipping on the pully when you engage the clutch.

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When i cut the fan on with the defroster the motor idle down and cut ingine off I have a 2004 trail blazer.


the ac clutch engages any time a defrosters on if you have a ac problem unhook the ac compressor that should take care of it till you have ac fixed

Apr 05, 2013 | 2004 Chevrolet TrailBlazer

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Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

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When I turn on my AC on my Trailblazer -six cilender 2004- the temperture goes up to Hi within a few minutes. I put in a new Radiator and new fan,but this didnot solve the problem


Did you replace the thermostat and bleed all the air out the system also? The fan clutch needs to be checked to make sure the fan is fully engaged or the engine will overheat.

Sep 14, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Bad Clutch Fan? Rear ac/heat don't work front only works on 4


The fan clutch isnt engaged at all times, therefore it may be normal to hold it in place (not recommended). On these trailblazer's 4.2L engine the fan clutch is electronically controlled. Usually when this vehicle's fan clutch malfunctions, there is a random ticking noise while idling or at a stop, also the "service engine soon" may turn on. As for the the fan speed problem, this may be a faulty blower resistor malf (typical) or climate control unit may be faulty. Hopefully this helps!!

May 05, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

After i put the ac on my bmw x5 2003 get over heat and smell burn


pls. check your ac compressor magnetic clutch attached in front of ur compressor if its working/ ac clutch engage when u turn the ac switch on and disengage when u turn the ac switch off/ it normally makes a clacking sound when it engage with the rotation of ur compressor/ if its not engaging it means ur magnetic clutch is stuck up giving excessive load to ur engine thats why it overheats/ it smell burnt because its magnetic coil is fried/ or check cooling system of ur car might be that coolant is empty/ fan is not working/ radiator is clogged or thermostatic valve is stuck blocking coolant flow....

Apr 09, 2010 | 2003 BMW 5 Series

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Ac won't turn on?


Your compressor clutch is not engaged that was why AC is not on. The clutch is controlled by several sensors: coolant temp, refrigerant pressure, compressor speed sensor, evaporator temp sensor... First to make sure your Clutch is working then start tracing back to these other sensors. Look at the compressor, there is a plug of electrical wire on it. One prong is for speed sensor feedback, the others are for power connectors to turn on the clutch. Jump wires to power to clutch to check if it is working. That is just the beginning of AC troubleshooting. Good luck.

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have you tried running a scan tool to check trans voltages and the valvebody of the trans operation? or even flush and conditioner of the transmission...hope this helps you...

Aug 06, 2009 | 2003 Chevrolet TrailBlazer

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