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2005 Mustang GT overheating

Asked by: 23 views Coolant Question

Gonna get right to it. 2005 Mustang GT, 3V 4.6. Replaced all components of the cooling system and everything is flowing how it should. Pressure tested the system and there are no leaks. All air has been bled from the system and will maintain 210degrees all day long at an idle. As soon as you give the car any pedal, either under load or no load, air gets back in the system and temp rises to about 216degrees and will not come back down until you open the bleeder screw. If you don’t bleed it, it will continue to rise. Did a compression test and number 5&6, which are adjacent cylinders, were about 10-15 PSI than every other cylinder. I’m thinking it’s the head gasket, does anyone have another opinion?


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    I think this article can help you out a bit, if you have not read it yet 🙂

    Overheating fix

    A compression test does not say that much, what you should do is to set pressure of around 2 bar in the coolant system, remove all ignition plugs and check down if there is water in the cylinders.
    Or use a gas analyzer at the coolant cap and see if the values rise on the analyzer = You have exhaust smoke in the coolant 🙂

    Ask A Mechanic Admin - Mar 18, 2018 |Reply

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