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Posted by Vaughn [99.14.94.53] on Friday, November 20, 2009 at 11:24:02 :
In Reply to: Manual heater control valve. posted by Chriscase [76.212.168.173] on Friday, November 20, 2009 at 09:02:49 :
When the engine is cold, the thermo allows coolant to circulate through the by-pass. The correct thermo has a cup that moves upwards into the thermo housing to gradually close off the by-pass as the coolant warms and the thermo opens. I believe the replacement 155 with the rubber "O" ring seals off the by-pass completely allowing the thermo to function as a modern day thermo only. This allows the engine to warm faster.