Question about 1991 Toyota MR2

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Bubbling in overflow bottle 91 mr2 n/a

After driving for about 20 mins when i park my overflow bubble is bubbling and spraying coolant out i have already done all checks for head gasket leak except a leak down test.i have changed thermostats twice and burped all the air heater core is not stopped up because it still gets hot and have flushed my and everybody i have asked are stuck any help would be greatly appreciated thanks

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  • lucky42039
    lucky42039 Jan 10, 2013

    i have already done the chemical test for the combustion gases.i really dont want it to be the water pump or head gasket because then i have to take the motor out to do either one



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Have you done the chemical test to check for exhaust gases in the coolant? I believe you can rent the tester from autozone, or another outlet. All you have to buy is the chemical fluid. Exhaust gas will change the color of the fluid.
It is also possible the impellers on the water pump may be worn, and not pushing enough coolant.
You should also check the fan or fans are working properly.

Posted on Jan 09, 2013

  • montehammons Jan 10, 2013

    Oh, didn't know the engine had to come out for a water pump. Maybe you should go for the leak down test, then. It would be good to know the internal condition of the engine, anyway, before proceeding. Are the fans working? Good radiator cap?



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Posted on Jan 02, 2017

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SOURCE: Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot

disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

Posted on May 08, 2012

  • 22219 Answers

SOURCE: change radiator and coolant is overflowing in

when a vehicle gets to around 10yrs old or a high mileage the head gasket starts to fail unlike the old copper ones so seek advice from a garage who will put a pressure tester on the rad and run engine then check for a build up of excessive pressure which is a sign of a head gasket fatigue

Posted on May 30, 2011

Big Kwan
  • 93 Answers

SOURCE: My truck only runs hot

To reliably check the head gasket without costing you a cent, idle the car hot, to opperating temp. then one by one loosen the spark plugs.

It is very important that you dont take out all the spark plugs at once.

Start with cylinder 1

Loosen the sparg plug
Have a mirror nearby (one that will fit over the plug hole closely)
Remove the spark plug
and then quickly place the mirror over the spark plug hole
after 3-4 seconds quickly check on the mirror if there is any sign of moisture.
If so the head gasket is blown on that cylinder

When the head gasket blows moisture escapes into the combustion chamber wich will mist up the mirror glass.

Repeat this processe with the other cylinders

Posted on Feb 09, 2011

  • 154 Answers

SOURCE: overheating after head gasket replacement

signs your water pump isnt workin i had same issue

Posted on Aug 01, 2009

  • 390 Answers

SOURCE: 1992 Toyota Celica - coolant

There is a fan coolant temperature sensor on the bottom of the radiator, it has an electrical connector on it, with the key on disconnect the connector, if the fans run constantly with the connector off replace this sensor.

Posted on Aug 20, 2011

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