Join Date: Dec 2000
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Re: Urgent ?\'s for CJDave (or anyone for that matter)
the bypass is the 3/4" or 5/8" hose that loops out of the thermostat housing and back into the water pump. the water pump is pulling hot water from the engine, thru this bypass hose, and pumps it back into the engine. it never goes thru the radiator to cool. i think the reason for this was to prevent air from being trapped in the system.
i ended up rerouting my heater hoses thru the bypass, and plugging one of the nipples on the water pump (above alt.). i have not done any extensive driving with this set-up, but in theory it should work.
if i were you, i would find a piece of round rod the same diameter as the ID of the bypass hose (brass, stainless, or even steel) and about an inch long and drill a 1/4" hole thru the center. take one end of your bypass hose off and shove this restrictor in a couple inches. put a hose clamp around it to hold it in place if you want (it can't go anywhere...). then put your bypass hose back on the same way it was.
what you'll be doing is restricting the amount of bypass from a 5/8" dia. tube to 1/4" dia. this puts more hot water thru the radiator and not back into the engine.
let me/us know what you do and if it works. also, it sounds like you need a new waterpump. i recommend a stock replacement pump.