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Discussion Starter #1 (Edited)
04 xuv slt 260k+ i6 engine

Recently replaced:
Fan clutch
Water pump
Thermostat
Relay

Symptoms:
intermittent over cooling
Overheating in traffic/idle
Ac not blowing cold unless driving. Randomly hear a pssst sound as if it has an air break blow off. Can feel the truck drag momentarily when this happens.
Fan does engage from time to time, but not like it should


The fan does kick on from time to time. Im at a loss for what to do next. I thought about the temp. Sending unit but the gauge works fine.

Edit: I've searched and haven't found a definitive solution
 

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2002 chevy trailblazer_lt
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520 Posts
I would get a Bluetooth OBD adapter like the one in the link below and also a smartphone app like Torque Pro or OBD Fusion and monitor the actual fan speed, desired fan speed and AC high pressure to gain an understanding of what is happening.

The parameters needed for monitoring fan speed are not in the apps but I can point you to that information if you go this route.



https://www.amazon.com/gp/product/B011NSX27A/?tag=elightbars-20
 

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Discussion Starter #3
Thanks, ill try this. I have an elm that doesn't work on this vehicle but ill try this one
 
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