Question about 2003 Pontiac Aztek

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I have a 03 aztek and the cooling fan is not comeing on when hot changed relays, thermostat is good ,water pump is good changed the coolant temp. senson on thermostat houseing but still no fan . both fans run with a/c on even checked the with straight wire can you help please.

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  • 444 Answers

Pull the plastic Module plug apart ,Figure out witch is the hot wire to the fan, End the ground wire ,Use a jumper wire to ground it to the body of the car Some where like a bolt going into the body or the engine some where, Take anouther jumper wire end hook it up to the hot wire on the fan .Touch it to the positive terminal on the battery to check if the fan comes on, If it doesn,t the fan motor is shot. They don,t last for ever,

Posted on Nov 03, 2012

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Posted on Jan 02, 2017

  • 74 Answers

SOURCE: 2004 pontiac aztek cooling fans not working

relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

Posted on Aug 26, 2008

gypsycat00
  • 224 Answers

SOURCE: cooling fan

Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.

Posted on Jul 22, 2009

  • 564 Answers

SOURCE: My 1999 Grand Prix 3.1 temp gauge was jumping up

ck out the temp censer that activates the fan to if its working,,need a scanner to do that

Posted on Apr 18, 2010

  • 59 Answers

SOURCE: 2001 Pontiac Aztek Overheating. Replaced

Sounds like you have a clog, or a collapsed hose. Try flushing the system.

Posted on Feb 28, 2011

  • 501 Answers

SOURCE: cooling fans on aztek no

there are 4 steps to check and you've mentioned all but one the relay which cuts the fan on'off. At an elec shop you check in this order power to fuse block, fuse & output side, temp sensor, relay, and fan motors. Get a new relay

Posted on Apr 28, 2011

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1 Answer

My car heats up in stop n go traffic. The temperature gauge can go as high as to the 'RED'. I adding water and coolant everyday. Are the fans supposed to come on as I am driving and the car heats up?


if you are adding coolant every day then you are experiencing coolant loss
could be from a leaking pump gasket , head gasket or other leaking item
have a compression test done to check for head gasket , cracked head
next have the cooling system pressure tested to find the cooling leak
lastly check the fan, fan relay , fuses and coolant temp sensor unit for correct operation

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Defective thermostat probaly staying open, Or a blockage in the cooling system , Flush out the whole ststem, End don,t have the front of the vehicle raise up,

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REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.

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Replace water pump, thermostat and temperature sensor on 2004 pontiac aztek still getting hot


have you checked to see if the cooling fan is working properly.if not then it will have to be checked to see if its the fan that is no good,wiring,or a relay.there are 2 temp sensors one for the gage/light and one for the computer to know what the engine temp is to alter engine controls and cooling fan operation.

Jun 14, 2011 | 2004 Pontiac Aztek

1 Answer

Over heating 2002 Aztek First mechanic we took it to: replaced intake manifold and water pump, flushed system because dex-cool coolant had caused damage. Still over heated. Same mechanic said it was the...


If the water pump and thermostat have been replaced and the system has been properly refilled and bled , the only thing left is the radiator. If coolant is not flowing through it properly , vehicle will run hot. If your car has overheated to the point of boiling over , your new thermostat may now be damaged again.. As for the fans , they only come on when the coolant reaches a certain temprature. Under normal driving conditions , they would not need to come on while the vehicle is moving , as the air flow from driving down the road would be enough to cool the engine.

Feb 03, 2011 | 2002 Pontiac Aztek

1 Answer

Pontiac Aztek running hot


You may want to do a inspection of your cooling system, here's a list that might help,
  • Check the thermostat, if it's defective replace it.
  • Check the coolant in the reservoir tank, it should be at the proper full level.
  • Sometimes when you change a thermostat there's a possibility you could get air in your coolant lines from having the coolant system opened up, this could keep your coolant from circulating through your system, if so you will need to bleed the air out of the coolant system.
  • The water pump should be inspected for leaking coolant out of the weep hole's, when a water pump go'es bad it may leak coolant, which would mean the seals on the pump are bad, also listen for squealing noise's coming from the pump when the car is started, if it squeals the bearings are bad, there is also a possibility the water pump fins are wore down from corrosion, there is no way to inspect this without removing the pump.
  • check the drive-belt for wear and tension, a bad tensioner or a bad drive-belt could have an effect on the operation of the water pump.
  • check the pressure cap on the coolant reservoir tank for good pressure, when you remove the cap you should hear a hissing sound this means you have good pressure in your cooling system, check for corrosion or build up on the cap, clean the cap if necessary, also check the coolant in the reservoir tank, it should be clean, if not you might need to have the cooling system flushed, during the flush you can observe if the coolant has a good flow through the system.
  • check the large upper and lower radiator hose's for crack's, swelling, and proper coolant flow.
  • Check the operation of the cooling Fan, and circuit, cooling fans use relays and fuses, some vehicles use more than one cooling fan, if your vehicle has two cooling fans there should be two relays and two fuses one for each fan, first visually inspect the fuses if one or both are bad replace them, you can test the relay or relays for continuity by removing them and doing a proper continuity test according to your relays circuit diagram.
  • Check the coolant temperature sensor, most coolant temperature sensors are located directly in the thermostat housing, this sends information to your pcm which determines when to turn your cooling fan on and off, if it's defective replace it.
  • Inspect the radiator grill for damage or debris build up.

Apr 18, 2009 | 2005 Pontiac Aztek

2 Answers

Running hot


most cars have two electric cooling fans ...one cools the engine and the other one turns on with the A/C to handle the additional heat lead.  Check the fuses and relays. 

Apr 03, 2009 | 1999 Dodge Durango

2 Answers

Is there a cooling fan fuse?


Everything in car is fused. The fans are controlled by a thermal sensor. You will need a wiring diagram to test for a faulty sensor.

Mar 29, 2009 | 1993 Mitsubishi Diamante

1 Answer

2004 pontiac aztek cooling fans not working


relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

Aug 26, 2008 | 2005 Pontiac Aztek

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