Question about Toyota 4Runner

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94 toyota 4 runner overheats, overflow boiling over when engine heats up. no heat inside of vehicle.....we are trying to change themostat but are not able to free housing. we remove bolts, hose but housing still wont free up....

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Use a 2x4 place it against or 1x4 then hit wood with hammer should break housing free without breaking it.sounds like closed thermostat for sure.

Posted on Mar 19, 2011

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Posted on Jan 02, 2017

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It isn't really possible to overfill with coolant so harm harm occurs. If your coolant jacket and radiator are full, that is normal, and if the coolant overflow reservoir then becomes full as well, the excess just runs out on the ground.

The symptoms lead me to think that when you refilled, a bubble formed in the system. This may be in the heater core, preventing any hot coolant circulating there.

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1. I would in the first place try to isolate this problem to a faulty thermostat and /or wrong fitment.

2. Get a new thermostat that is the correct spec for the vehicle. If you don't know check with the dealer.

3. Make sure you are positioning the thermo correctly in its seat and when connecting everything back up there is nothing impeding coolant flow like a poorly fitted gasket.

4. Importantly make sure that when connecting the cooling system back up and after topping it up with the correct coolant you purge the cooling system of air. If you do not do this the vehicle will overheat and potential engine damage will result.
Many vehicles have bleeder screws in place to bleed out air from the cooling system. Consult the workshop manual for the vehicle for advice on the correct procedure for bleeding air from your cooling system.

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