Plantoil/diesel conversion basics
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crpage

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I have read that you recommend a parallel coolant tapping system.  Which makes sense for my vehicle.  So I was planning on  tapping into the coolant before the heater core.  But I wasn't sure where to return the coolant so the thermo-siphon system would flow correctly.  I thought it would work great if I just return the coolant to the back side of the valve that turns the heater on.  That is right up until I need to use the heater.  Please help.

Thanks,
Christian

danalinscott

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Quote:
Originally Posted by crpage
I have read that you recommend a parallel coolant tapping system.  Which makes sense for my vehicle.  So I was planning on  tapping into the coolant before the heater core.  But I wasn't sure where to return the coolant so the thermo-siphon system would flow correctly.  I thought it would work great if I just return the coolant to the back side of the valve that turns the heater on.  That is right up until I need to use the heater.  Please help.

Thanks,
Christian


The cabin heater supply is not thermo-siphon...it is actually circulated by the engines "water" pump. There should be two hoses going to the cabin heater. One is "TO" and the other is "FROM". 

If you tap into the TO hose for your Hot Coolant Supply and into the FROM hose for the Hot Coolant Return  the parallel  coolant circuit will normally circulate a bit. But you may want to install a Ball Valve in the cabin heater circuit return hose (between the cabin heater and the parallel coolant circuit Return Tee) to regulate the flow a bit better...and allow easy purge of air bubbles in that circuit (which can prevent flow).   If you do not install a ball valve and find you have no coolant flow in the parallel coolant circuit initially try partially pinching that point in the hose  (between the cabin heater and the parallel coolant circuit Return Tee) partly closed with a needle nose vice grip to purge any air locks.

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