Overheating
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Author Topic: Overheating  (Read 3485 times)
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BlackaztekGT01
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« on: April 13, 2015, 03:12:00 AM »

I have an 01 GT. I just replaced the head gaskets. Now it is still overheating and has extreme air pressure in the cooling system. I have bleed the system several times and that will work for a short amount of time, but once I shut the engine off and then restart it a little while later it goes back to heating up and has more air in the system. I run out of ideas as to what to do next.
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Tom Moog
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« Reply #1 on: April 21, 2015, 10:31:56 AM »

Go to Auto Zone and get a "Block Tester" and some fluid for it. If the blue fluid turns yellow during the test, you have a pathway between the exhaust and the cooling system.

The block tester is a glass tube that you out the fluid into and a squeeze bulb on one end. You stick the other end into your radiator opening while the vehicle is running. The tester "sniffs" the air coming out of the cooling system. If there is any exhaust in the coolant, the liquid in the tester will yurn yellow. If you get yellow fluid, there is exhaust entering the cooling system. That would indicate that you have a bad head gasket, cracked block, cracked head, etc.

High pressure in the cooling system is almost a dead giveaway for the above.
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Tom Moog

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BlackaztekGT01
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« Reply #2 on: March 14, 2016, 01:27:06 AM »

I was able to fix my pressure problem by drilling a small hole in the thermostat. But I have since figured out that my problems started due to a faulty body control module. It was making the cooling fans not work and the temp gauge to read incorrectly. So that lead to blown head gaskets. Then the new thermostat didn't have a poppet valve in it like the original one did which lead to the pressure problem.
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mfarhan797
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« Reply #3 on: March 25, 2016, 02:40:02 PM »

Hi,

I just bought 2005 Aztek and I noticed that during a long drive, the engine temp just below the red line for H. after I stop for a while then the gauge will back to half. Its never been to red line (H) but just stay as it is (before the line). Is that normal? Thanks.
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Dave
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« Reply #4 on: March 31, 2016, 11:44:00 AM »

Hi,

I just bought 2005 Aztek and I noticed that during a long drive, the engine temp just below the red line for H. after I stop for a while then the gauge will back to half. Its never been to red line (H) but just stay as it is (before the line). Is that normal? Thanks.

Hi mfarhan797 - welcome to the AFC! II think you'll find this site is an awesome resource, definitely helped me a lot since I got my Tek.

Your temperature issue is definitely NOT normal, so you'll want to get it checked. First thought on my end is maybe your water pump - I had pretty similar behaviour with my ride a couple of years ago and that was the issue. Next thing would be of course your coolant, so I would recommend getting it looked at before things get worse.

Good luck, let us know how it turns out!
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Former owner of a 2003 Electric Blue beauty who met her end at 271,000 Kms.
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« Reply #5 on: April 09, 2016, 06:08:23 AM »

Hi everyone!
Just wanted to add my 2 cents worth.
Besides changing to green coolant with a good flush we had to reverse flush (with compressed air) the heater core at the disconnect lines, under the hood.

It does sound odd but know this is one way to get rid of the sludge buildup witch can create a air pocket.

Keep on Teking! 
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Yellow 2002 1SB FWD
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