Question about 1991 Toyota MR2

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Cooling system bubbling

Hi, i have a 1991 mr2 , i do everything to bleed my cooling system and teh car still bubbling and the coolant comes out when i shut off the car.
my car does not have heater (is eliminate in puerto rico).I think that is make it easy to bleed.i rebuild the engine complete and i presurized the head cylinder.if you have any solution to my problem please send me back.
thanks ,

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  • a1motionfork Jan 24, 2009

    the filler neck and the radiator cap is new ,oem.

  • a1motionfork Jan 24, 2009

    13 psi ,but first, the coolant was bubbling before comes out from the coolant reservoir tank.

  • a1motionfork Jan 24, 2009

    yes it has a thermostat and runs like 160f -170f.

  • a1motionfork Jan 24, 2009


  • a1motionfork Feb 06, 2009





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Radiator cap needs to be replaced. If the cap is weak it will not hold the pressure and it will bubble back into the reservoir.

Posted on Jan 24, 2009

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  • Troy Bennett Jan 24, 2009

    how many pounds of pressure does the new cap hold? If it does not hold enough pressure it will still do this even if it is a new cap. 18lbs is the biggest you can get.

  • Troy Bennett Jan 24, 2009

    How hot does the motor run? Does it have a thermostat?

  • Troy Bennett Jan 24, 2009

    it may have an air lock in it (when you install a new thermostat, take an aspirin and lodge it in the thermostat and when you fill it with water, the aspirin will dissolve and you won't have air in the engine. This will work.)



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you may have to bleed the cooling system once you have done this there is a bleed nipple near the distributer undo this while the engine is running and the heater is switched to hot but the blower fan
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Hello, and welcome to FixYa. Please allow me to assist you.

The MR2 auto transaxles are very reliable units. Just change the ATF with the correct fluid every 30,000 miles. If it has high mileage, 90 + K miles, and is a dirty colour, I'd recommend a transmission flush. This will remove all of the dirty fluid from the system.

The MR2 non-turbo was a fun car, and had very few comon failures.

Try to stay away from the turbo cars, the turbos are know to fail, and the parts and labour to replace the turbo is very expensive.

The MR2s are rather quirky when it comes to servicing the cooling system, you have to bleed the air out. The necessary procedure is in the owner's manual, or online.

Other than those items, the MR2 is a very decent and reliable car. A little noisy, with the engine right behind you, but, that is part of the fun.

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I have not heard from you to send you the instructions. Thanks.

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Blowen head gasket

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I would look at this long before I ripped the head off for no reason.

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