Quote:
Originally Posted by CUSTOM/10
No, I believe it's 1/2" and I am using it for my electric fan control .
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OK. You could tee into your bypass hose going from your intake to your water pump, and it would bypass well under all conditions, but I doubt it would circulate your heater water very well.
I'd recommend to run your 3/4" heater return hose into a reducer if necessary and into the lower radiator hose using a Tee, shown below. Measure what size you need and order one. KAT's has a variety of them, they are made for block heaters but you can buy separately for about 10 bucks.
http://www.oreillyauto.com/site/c/se...0650/C0076.oap
http://www.oreillyauto.com/site/c/de...0886&ppt=C0108