EZ Heating System
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Engine oil cooler will be termed the “cooler”.  

Cabin oil cooler with be termed the “heater”


In operation, oil only flows from the engine (center fitting of accessory case) to the cooler/heater at an oil temp of >185 F (as controlled by the engine veritherm).  It first  flows to the oil heater.  The cooler veritherm controls the quantity of oil flowing through the cooler (essential to keep the oil temp hot in the winter).  If the oil temp is <180 F the oil bypasses the cooler, if > 190 F the cooler veritherm closes and directs oil into the cooler.  The cooler veritherm is essential to ensures the oil leaving the cooler is 185 F (summer or winter). The oil then leaves the cooler, enters the cabin supplying the cabin heater.  You’ll remove some more heat and the oil returns back to the engine return (the fitting near the oil filter).


The reason for both veritherms are installed: the engine one bypasses the oil cooler/cabin heater system until the engine oil is warmed up to 185 F.  This protects the oil filter from the high viscosity of cold oil.  The cooler veritherm regulates the oil flow to maintain 185 F in the winter when you have ice cold air through your external cooler while you are also taking lots of heat away from the system in the cabin.  Your system is completely automated, and there is no need to cover the oil cooler in winter to maintain oil temperatures.


Bypass Valve

This is optional.  It allows the hot oil to bypass the cabin area in the summer (if you live in the south like I do).  Nothing wrong with not installing one, but where I live cooling is generally more an issue than heating for most of the year.  In spring you open the valve (bypasses the cooler), in fall you close the valve.