Question about 2008 Chevrolet Uplander
Fans on after start up low first than high , no codes no bad relays
You have to see if your coolant sensor is within the correct parameters of operation incorrect readings may not turn a light on but will tell the fans to turn on.
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
It can be the relay is latching by itself or because the thermistor is faulty or the temperature control unit is faulty.. an errorr in the circuit.
You might have to confirm one of them.
Posted on Sep 25, 2010
Do you mean the fan fuse? I ask because relay's don't just "blow" . If it is in fact the fuse that is blowing... with the car off and fan off try turning the blade. If it's very difficult to turn, then yes your problem is in the fan motor. If it's not difficult to turn it could still have a problem and be pulling too many amps. You can hook up an ammeter in line to the fan and see how much amps the fan is taking. If it's close to the amperage rating on the fuse it is likely the cause of the fuse blowing.
Posted on Dec 05, 2009
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A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The BCM and PCM/ECM command High Speed Fans on under the following conditions:
Engine coolant temperature reaches 110?°C (230?°F).
A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
When certain DTCs set.
The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
DTC P0480 Cooling Fan 1 Relay Control Circuit
DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit
DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage
DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage
DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage
DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage
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