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I recently replaced the thermostat water pump No blown head gaskets on my 01 Aztec SUV but its still running hot what could be the problem

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If you do not have "good heat" coming from the heater there is a very good chance you have an air pocket trapped within the engine.If this is the case, try to get the front of the vehicle elevated as high as possible (a small hill works and air will travel to the highest point) with radiator cap removed,heat turned to the warmest selection on defrost.Periodically revving the engine then letting it idle,then turn the vehicle off listening for the gurgling(or strange noises,which is actually the air escaping to the highest point :) it may take several attemps,but in the end it works.

Posted on Apr 14, 2014

  • Mike Apr 15, 2014

    All good comments above. I'll add that the rad could be worn out, it's about the right age. The metal cooling fins on the rad may actually become brittle and crumble when touched. The rad can be replaced or rebuilt if that's the case.


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Could be a blocked or partially blocked radiator. Radiator cap may not be holding enough pressure. Coolant solution maybe to weak. Cooling fan may not be operating correctly.

Posted on Apr 14, 2014

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  • bubba20563
    bubba20563 Apr 15, 2014

    Good points Aran.I would rule out the coolant solution,beings a cooling system can stay at running temperature on straight water :)

  • Aran F Apr 15, 2014

    Coolant solution does alter the boiling point of coolant and if the system is not holding pressure may start to boil especially if the system has blockages. A bunch of small problems can manifest as one issue im sure you will agree

  • shannon floyd Apr 15, 2014

    good points. check the cooling fan,motormay be going bad and slowing down. wont pay much attention to it if not looking for it.



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SOURCE: water pump not pumping water through engine

it sounds like there is a blockage in the system look for very stiff coolant lines or it coulc be the heater core in the cab or on the fire wall. is the engine getting up to temp ? or is it just not getting hot in the cab?

Posted on Feb 13, 2009

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SOURCE: My 2002 buick rendezvous is overheating. The water

first check to make sure the cooling system is not air bound,takes a while to bleed off the air,try this and get back to me Thanks Ray

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SOURCE: 2000 Malibu keeps running hot.

You replaced the head gasket but did you get the head or heads checked for cracks or check the block for warpage?

Posted on Nov 21, 2009

SOURCE: 1999 Alero: I replace the head gaskets thermostat water pump n...

OK you have done the engine side of things. If you have an electric radiator cooling fan make sure it comes on when radiator is hot, if not the fan motor is caned or the thermostat switch is faulty. Sometimes the fan motor is supplied by a fused/relayed circuit in which case these items will also need to be checked. Check that not only does the top hose from the engine to radiator get hot but that the bottom one does too. If not this would indicate a blockage perhaps in the radiator core due to sludge. If full of sludge give both ends a flush out with a high pressure hose. Like wise do the same with the bottom hose back to the pump. If the water is circulating and the radiator fan is working then the normal cooling system is working as it should. f the engine is running hot one last thing is to find the EGR valve and check that it is opening as it should. If not the combustion temperatures go very high. One indicator of a hot engine is blue/glazed spark plugs so take one out and check it for signs of hot running. If hot then look to clean the EGR valve and associated exhaust gas feeder pipe with frayed cable, cloth and and carb cleaner spray.

Posted on May 05, 2010

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SOURCE: 1996 dodge ram. Vehicle runs hot. I have replaced

Hello there"
sounds like you have done a lot with this there is a few things that you can do to ensue every thing is running right.
first if you can get a handheld thermal gun and check the temperature at the temp sensor on the radiator or block then see what it reads compared to the guage to ensure the guage is correct.
next check the temperature at both the top and the bottom of the radiatoer if there is a big difference in temps the radiator is partially blocked a radiator will increase 30 to 100 degrees if the radiator is 20 percent blocked.. also check to ensure that the radiator hoses are not collapsing.
Now ensure that you are not gettin air in the system by way of the water pump gasket or by loose hoses ok?
and finaly check to ensure that the heater core is not leaking and drawing air into the system or is clogged this will make a vehical give the overheating symptom also ok?
Let me know how this is going
Best regards mikle

Posted on Jul 07, 2010

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My 2002 Aztec lost all it's anti-freeze I noticed that the back left was wet, and found no blown hoses in the front. does this indicate a blown water pump and if so how do I replace it

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Overheating all the time

First, anytime a thermostat is overheated, it's ruined.

Second, if this car has electric fans, are they running when they are supposed to? If not, replace the fan control module, and/or test/replace the fan motors.

When the radiator was replaced, were you certain to purge the radiator and engine of all air before replacing the radiator cap? When you refill an emptied system, you always start the engine and watch the fill level in the radiator, refilling as necessary until you know the thermostat has opened. You need to have the heatrer controls set to full hot as well. Once the radiator is filled, put the cap in place, and fill the reservoir to the level indicated for a hot engine.

Finally, check to make sure the lower radiator hose is not collapsing while driving. While this is difficult to check (because your going down the road), just replace it when you replace the thermostat.

All of this assumes you do not have a cracked head or blown head gasket.

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Running hot, changed thermostat and flushed coolant, also changed top hose. Any ideas why it would still run hot?

1. blocked radiator core
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These would be the major problems causing the overheating.
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Chances are, and I know this sounds kind of stupid, that the thermostat was installed backwards. I had the same problem once, after replacing the entire cooling system it still overheated and that is what the issue was. I would definitely check that. I hope this helps and please don't forget to rate me.

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