Question about 2005 Pontiac Aztek

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Pontiac Aztek running hot

My 2005 Pontiac Aztek runs hot. It isn't quite in the overheat zone but almost. Why does it run like this all the time. I never had a vehicle that ran that warm all the time.

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  • Roberta Smith
    Roberta Smith May 11, 2010

    just offhand i would suggest it's a partially stuck thermostat... not open fully so flow is restricted.

  • Anonymous Mar 19, 2014

    I am trying to replace the coil pack on my 03 Pontiac Aztek but cant find it. where is it located?

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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.

Posted on Apr 18, 2009

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Thank you for using Fixya and Auto Zone also Scan for DTC coders free of charge.

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Car runs hot. Its 2005 grand prix


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Run up to temperature and check again for level (when cool again)

Check that the radiator is getting really hot quite suddenly when running from cold, as this is the best way of checking thermostat operation.
When over a set temperature (check your manual) the fan should come on.
If it never does - troubleshoot the fan (temperature switch or sensor first, then fan on direct feed to see if it powers up ok)

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Running hot


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