[DeTomaso] Heater control valve

[B. Seib]

electronic control valve that is advertised on eBay
(http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280634203608&
viewitem=&sspagename=STRK%3AMEWAX%3AIT)

"Also this bypass valve has 2 inlet and 2 outlet heater hose connections.  A
bypass valve is when the valve is in the closed position and the water is
not flowing into the car's heater. The benefit of this is that the hot water
does not flow into the car, but it allows constant water flow back to the
engine which will help in cooling the vehicle. The water is continuously
flowing through the heater hose and does not stop the flow like the original
valve did."

----------------------------------------------------------------------------
----------------------------------

Just a note of caution on this:

The only benefit to allowing any portion of the coolant to bypass the rad
and return to the engine directly, is when the engine is cold. Once it's hot
outdoors, allowing "constant water flow back to the engine" actually impacts
negatively on the engine cooling system, moving in the direction of
overheating.


"The water is continuously flowing through the heater hose and does not stop
the flow like the original valve did."

In fact, the original valve helps to add capacity to the cooling system by
stopping the bypass of coolant in hot weather (if it's working).

These things matter in a mid-engine car with marginal cooling system? Of
course, manual shutoff valves would stop this loss by bypass too.

Barry