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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Overflow vacuum not working.

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Old 11-12-2009, 10:18 AM
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Overflow vacuum not working.

Ok so I have my coolant "mysteriously" disapearing. Over the coarse of a week or so my operating temp is higher and higher. When I fill it back up the temp gauge is right where it needs to be. I check the overflow tank and it has alot of fluid in it. Like not just at the "Full" mark, its all the way past that. So based on this knowlege, http://wiki.answers.com/Q/How_does_a...flow_tank_work ive figured that my radiator isnt creating that vacuum to get all the fluid back into the radiator. So do I have a break in the system somewhere? Where all the pressure is escaping out of? New radiatior, new t-stat, new radiator cap. 22re.
Thanks fellas.
Old 11-12-2009, 02:21 PM
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Anyone?
Old 11-12-2009, 02:28 PM
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Check hoses. Turn the truck on and let it run a while, get under it and look for leaks. Check near throttle body and hose coming out of the water pump upper and lower rad hoses..... Loose clamps? Intake manifold gasket leaking..... got smoke out tailpipe?
Old 11-12-2009, 04:31 PM
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I currently have a small leak from one of the small hoses underneath the intake manifold.
You can check that area by removing the RF tire wheel well cover plate. (4 10mm bolts).
Old 11-12-2009, 06:37 PM
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Assuming you don't notice leaking coolant, I would suspect a faulty radiator cap or a leak in the hose inside of the recovery tank, which wouldn't allow coolant to be vacuumed back into the radiator.
Old 11-12-2009, 07:34 PM
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Originally Posted by GreyGhost
a leak in the hose inside of the recovery tank, which wouldn't allow coolant to be vacuumed back into the radiator.
That sounds like something promising. Could it just be the tiniest of cracks or breakages in that pickup hose?
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