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93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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Anonymous Poster
Jun 6, 2007, 8:40 AM
Post #1 of 5
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93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 6, 2007, 9:05 AM
Post #2 of 5
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Re: 93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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Does it immediately start putting coolant into recovery tank? If so that sounds like a head gasket problem,
T
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Guest
Anonymous Poster
Jun 7, 2007, 5:27 AM
Post #3 of 5
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Re: 93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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no, the coolant transfers while driving..so every 20mi or so you have to add coolant to radiator...and empty the overflow resevoir...
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 7, 2007, 7:04 AM
Post #4 of 5
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Re: 93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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With everything normal what happens is the coolant (cold) expands perhaps a pint or a little more and that is sent to the overflow/expansion/recovery tank -- note the full cold and full hot marks on that tank.
When system cools again (perhaps even when driving it might do some exchange) it contracts and draws the coolant back into the radiator keeping it totally full all the time.
Rad cap is the pressure regulator. When it exceeds its mark like 15psi it let the excess out and a little flapper (in cap) will allow it to draw back as the coolant in the engine/radiator contracts. If the cap has failed it just puts out the expanded coolant and just draws back air. That would be just a bad rad cap problem.
In that this can go from full at radiator to you say empty that's too much too fast for 20 miles. What is probably happening is the head gasket is allowing compressed air/fuel mix or exhaust into the water jackets and over pressurizes the system quickly which pushes coolant out at first but was replaced with that air. It won't draw back all that much at a time so recovery tank would overfill.
If engine what overheating for any reason high enough to boil that too would push out coolant and not recover all of it again. With that you should see that it is overheating which could be a thermostat, poor cooling to fan radiator or compremised radiator to dissapate heat
Just filling the radiator when quite low still leaves some air in the engine which will get up top to the radiator and purge just the air and draw back just coolant. Some cooling system are fussy and need to bleed out the air -- some have a little plug up top or some you may just loosen up the highest hose to speed up the true full amount. Air in the cooling system does not transfer much heat so engine would run hot or overheat if it's excessive. A real hot engine and boiling in cooling system will stop throwing heat if you blast the heater on as the air even though hot will not exchange much heat and that's a clue about air whether from another source or just boiling is going on.
Test pressure in system with engine cold by squeezing upper rad hose and you can feel there isn't much or any pressure in it. Start it up and feel that hose, careful as they get too hot to touch when fully warmed up, and if it pressurizes quickly as in before engine is warmed up then the likely problem is a head gasket putting air in. The gasket can fail in many ways like coolant leaks out, coolant leaks and burns, oil gets in coolant, etc.
You could pressurize the cooling system with a pressure tester for that not exceeding the cap's limit and push coolant backward thru the leak into a cylinder sometimes and you must be careful as if too much coolant gets in combustion chamber the piston can't compress that and could break the piston or other parts overstressed.
If this car is not overheating from your description that would be unusual. I wouldn't instantly blame the head gasket without testing it out that it really is the problem as that's an involved job you don't wan't to do unnecessarily. It could have a fault that did allow overheating and that could have been the source at first and a result could be blowing the head gasket so both would have to be fixed.
Hope that explains it for you,
T
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Guest
Anonymous Poster
Jun 7, 2007, 8:17 AM
Post #5 of 5
(2838 views)
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Re: 93 toyota camry/radiator overflows into expansion tank daily and empties radiator would a stuck thermostat cause such a problem?
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