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Old Nov 2nd, 09, 12:07 PM   #3 (permalink)
Steptoe
Senior Tech
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,316
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Re: Car Overheating after Waterpump install and sitting for a long tim

Yep could be the thermostat not opening right up or stiuck 1/2 open

AND/or someof the radiator cores are blocked... can usually feel these by fireing up from cold, run about 1000 to 1200 rpms and with your hand check the radiator warms up evenly... in particular check lower cores.
Common after a rebuils and the radiator hasnt had the headers pulled and manually cleaned out...it cooled ok before so assumption is made it is ok, but there are bits of stuf coming out of the engine going into 1/2 blocked cores ..blocking enough to cause a problem

Radiators, like oil pumps, water pumps should always be cleaned manually when re building an engine....fully flushed at least 1x per yr

The only time air locks can be a problem is refilling the cooling system with the car facing down hill....easy way to eliminate the problem is face the car up a slop.... or just jack the front up a bit.
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