Here is what you do bypass servo all together, go to your auto parts store and get a manual heater valve , now where the heater core comes out of the fire wall put that manual valve in the line coming off the engine block to the valve this valve should come with a cable that needs to come inside so you can shut the heat off or on. if you just want heat bypass servo all together and make sure heater hose goes directly to the heater core and then back out to the engine. that should get you threww the winter,get some extra 5/8 heater hose for your bypass good luck.