Question about Chevrolet Cavalier

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2001 chevy cavalier,cooling fan wont come on,relay o.k,temp sensor o.k,coolant level o.k.,chec engine light on,also trac light on,also a/c compressor clicking on and off,code reader says cooling circut problem.electrical wires and connections look o.k. pcm ?

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  • Chevrolet Master
  • 6,826 Answers

Could be a p.c.m. if you can't read codes.

Engine light if giving a cooling circuit problem, senses that the fan won't come on. Trac goes on when the abs wheel speed sensors don't sense right speed (open or closed circiuit). Could be a fusible link near starter.

a/c clicking on and off, could mean charge is insufficient or too much r134a in the system.

Those are my thoughts on it.

Posted on Jul 22, 2010

Testimonial: "great info,code po480,could something have got wet when car overheated?"

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The location of a 2002 chevy cavalier cooling fan sensor


The cooling fan is controlled by the PCM - powertrain control module through a relay ! There is no cooling fan sensor , there is a coolant temperature sensor ! This coolant temperature sensor is an input to the engine computer , if there were a problem wit the sensor the check engine light would be on .
Cooling Fan Control
The engine cooling fan system consists of one cooling fan and one relay. The relay is powered by the battery positive voltage circuit and controlled by a switched ground from the powertrain control module (PCM).
During operation, the PCM supplies the ground path for the cooling fan relay through the cooling fan relay control circuit. This energizes the cooling fan relay coil, closes the relay contacts, and supplies battery positive voltage from the cooling fan fuse through the cooling fan motor supply voltage circuit to the cooling fan. The cooling fan motor is grounded through its own ground circuit.
The PCM commands the fan on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
A/C is requested and vehicle speed is below 100 km/h (62 mph) with A/C pressure above 1413 kPa (205 psi).


?€¢
Vehicle speed is less than 8 km/h (5 mph) for more than 750 seconds. The fan will turn off when vehicle speed is greater than 8 km/h (5 mph) for more than 20 seconds.

Jun 12, 2015 | 2002 Chevrolet Cavalier

3 Answers

I have a 2001 cavalier that is overheating. I replaced the thermostat and it still overheats. There is lots of heat from the heater. What can the problem be?


Your radiator may need flushed or replaced.
Your Fan my not be working properly.
Your Catalytic Converter may need replaced.

Dec 11, 2014 | 2001 Chevrolet Cavalier

1 Answer

I have a 2001 chevy impala with a 3400 v 6. when the engine is cool the fans run but when the engine reaches operating temp the fans go off.


If the check engine light is not on, I would want to check the computer with a scanner to see what the temp sensor is telling the computer the coolant temp is. The problem could be in the computer or the fan relay.

Sep 05, 2012 | 2001 Chevrolet Impala

2 Answers

2003 chevy cavalier with no heat and temperature doesn't rise past 40 degrees engine code P0128 comes up when checked and the thermostat and radiator have been replaced still isn't fixed what do i do?


A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
Possible Solutions

Feb 27, 2011 | 2003 Chevrolet Cavalier

2 Answers

My a/c comp and engine cooling fan are not working it seems like they both quit at the same time is there a sensor that opperates both on a 2001 chevy cavalier


there is a fan relay, and an AC relay that both turn the fan on at certain times, including when the AC is on. a coolant temp sensor tells the computer (ECM) to turn on the fan but only when the engine reaches a certain temp. an electronic component locator can show you where these sensors and relays are located. they are not very expensive. your local auto parts store can look that up for you.

Sep 03, 2010 | 2001 Chevrolet Cavalier

2 Answers

My electric fan wont come on.


First check the fuse,then check to see if the coolant level in the radiator is low,then if you can check the cooling fan relay,and the cooling fan motor to make sure it is good,if all this checks out fine,then replace the coolant sensor,and bleed the cooling system of all the air in it.

Jul 20, 2010 | 2001 Chevrolet Cavalier

2 Answers

I have a 1999 chevy cavalier and the cooling fan will not start


CHECK COOLING FAN FUSE AND RELAY.IF BOTH GOOD SCAN CAR TO CHECK COOLANT TEMPERATURE SENSOR FAULT CODE.THE PCM AND COOLANT TEMP. SENSOR IS WHAT CAUSE FAN TO RUN AT CERTAIN TEMPERATURE.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN REPLACE FAN MOTOR.IF FAN RUNS YOU HAVE SHORT OR BROKE WIRE IN THE COOLING FAN ELECTRICAL CONNECTOR.

May 06, 2010 | 1999 Chevrolet Cavalier

1 Answer

My 1987 Chevrolet Z24 Cavalier cooling fan will


since you have already tested fan and relay and both work, the problem may be the engine temp sensor. There are two sensors. One goes to instument cluster. This is engine coolant temp sensor, the other is engine temp sensor which is usually attached to engine block, sometimes they are connected to thermostat housing with the coolant sensor. You can pully the engine temp sensor and test that sensor same way as relay. (with mulitimeter)

Jun 03, 2009 | 1987 Chevrolet Cavalier 4 Door

1 Answer

Cooling fan wont work


The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Sep 26, 2008 | 1998 Chevrolet Cavalier

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