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Eric, Automotive Repair Shop Manager
Category: Chevy
Satisfied Customers: 31913
Experience:  20+ yrs. experience as repair shop manager and technician.
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I have 2008 Malibu 4 cylinder that is having a weird

Customer Question

I have 2008 Malibu 4 cylinder that is having a weird electrical (?) problem. At various times the temperature gauge will not function. Wjen this happens the air conditioner will not work. Any suggestionsl
Submitted: 12 months ago.
Category: Chevy
Expert:  Eric replied 12 months ago.


The most likely issue is a fault in the ECT (engine coolant temperature) sensor. This sensor sends a signal to the temperature gage as well as used for operation of the engine cooling fan. If the fan cuts out due to loss of this signal, the pressure in the ac condenser rapidly rises and the ac pressure switch immediately cuts off the compressor so it is not damaged. This results in no cold air from the ac.

This may be an internal fault in the sensor, loose wiring, loose connector, or chafed wire intermittently shorting.

The ECT sensor is located on the back side of the engine - see attached

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Expert:  Eric replied 12 months ago.

I noticed we have not yet resolved your concern you asked about. I would sure appreciate it if you would reply so I can offer my skills and knowledge and repair guide access to help as best I can.

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