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Overheating problem - 06

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Old 02 Jul 2017, 11:26 pm
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Join Date: Jul 2017
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Unhappy Overheating problem - 06

Hey all,

I've had a 2006 PT for over three years and it's been a great runner.
However last summer, while driving through the mountains, she over heated. The mechanic replaced the thermostat and sent me on my way. However, the next day it overheated again. My mechanic said it just needed to be burped and sent me on my way yet again.

However, the problem still wasn't fixed. For a year now, the cooling system will kick out all of the coolant into the overflow tank and the radiator will be bone dry. So I've drained the overflow tank, and refilled the radiator every so often. Recently, I took it back to my mechanic and yet again, they replaced the thermostat and radiator cap and sent me on my way. However, the problem still isn't fixed.

More specifically it follows a similar pattern.

When I refill the radiator through the cap, it runs fine for a few days to a week or so. Then slowly the coolant is pushed into the overflow tank. Then all the sudden, when I start up the car and drive, it immediately goes up to 3/4 on the temperature gauge, and slowly goes down to around halfway. Eventually the car starts heating up at red lights and slowing when I depress the gas pedal. Even if the car is in neutral, when I depress the gas pedal the temperature gauge slowly goes down. Then it gets so annoying that I refill the radiator, drain the tank and the process starts all over.

A few other things I'm noticing are that sometimes when I turn the car off I hear a loud bubbling sound coming from the dash, and when I start driving I can often hear a trickling sound of water rushing around.

I'm hoping you all can point me in the right direction so I don't take my car in the shop for another couple hundred dollar fix that isn't going to help.

There's never any coolant on the ground under the car, so I'm not sure if the leak is internal or not.

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Old 02 Jul 2017, 11:52 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
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Default Re: Overheating problem - 06

First thing I would suggest is do a engine coolant pressure test.

If that checks out I would suggest you check the little hose coming from the radiator cap to the overflow tank. Make sure there is no cracks or leaks.

Has the head gasket been replaced on this engine?
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Last edited by ptcruisersteve; 03 Jul 2017 at 12:01 am.
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Old 03 Jul 2017, 03:50 am
_PTGT03's Avatar
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Join Date: Oct 2015
Location: Abbotsford, British Columbia.
Posts: 764
Default Re: Overheating problem - 06

second on the coolant pressure test. also perform a test to see if there are exhaust gasses in the coolant.
note due to the special design of the coolant system, it requires a special procedure to fill it, and then it can take up to three drive cycles to allow all the air trapped to escape. during this time the temperature can slightly deviate.


CAUTION: Do not use well water, or suspect water supply in cooling system. A 50/50 mixture of the recommended ethylene glycol and distilled water is recommended.

Close radiator draincock. Hand tighten only.

Open, but do not remove cooling system bleed valve.
Attach a 6.35 mm (0.250 inch) inside diameter clear hose that is 120.0 cm (48 inch) long to the bleed valve. Route the hose away from the accessory drive belts and radiator fan. Position the other end of the hose into a collecting container. The hose will prevent coolant from contacting the accessory drive belts, A/C compressor, and other components.

Remove the cooling system pressure cap. Install Special Tool 8195 Filling Aid Funnel.
Use the supplied clip to pinch overflow hose.
NOTE: Be careful not to spill coolant on drive belts or the generator.

NOTE: While filling the cooling system, pour coolant into the larger section of the Filling Aid Funnel 8195.

Slowly fill the cooling system until a steady stream of coolant flows from the attached hose on the bleed valve.
Close the bleed valve and remove the hose.
Remove clip from overflow hose and remove funnel 8195.
Fill coolant to the top of the pressure cap neck.
Install cooling system pressure cap.
CAUTION: Coolant may leak out of the bottle overflow tube if filling too rapidly.

Slowly fill coolant reserve/recovery bottle to at least the FULL HOT mark with the recommended coolant. It may be necessary to add additional coolant to the reserve/recovery bottle after three or four warm-up/cool down cycles to maintain coolant level between the FULL HOT and ADD marks. This is due to the removal of trapped air from the system.
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Old 04 Jul 2017, 10:02 am
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Join Date: May 2017
Location: Phoenix, Arizona
Posts: 26
Default Re: Overheating problem - 06

You need to find a mechanic that is willing to actually try to figure out what is wrong. Unfortunately many mechanics just like to throw parts at a car until it is fixed. For you, the owner, this can get very expensive.

When you fill the coolant are you running the car with the HVAC at the heat position for a few minutes? This will help you get a maximum fill. I would also use a spill proof funnel to help remove the air that may be trapped in the system.

I use this one...
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head gasket, overheating, radiator, thermostat

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