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Date:         Sun, 4 Feb 2001 23:45:26 -0500
Reply-To:     John <johnpatt@WARWICK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John <johnpatt@WARWICK.NET>
Organization: PattonSystems International
Subject:      Coolant pump specs
Comments: cc: Steven Denis <NotaJeep@AOL.COM>
Content-Type: text/plain; charset=us-ascii

Hi Steve,

I agree with you that such info may be interesting but since the volume only varies with RPM it can't correct any problems. On my '86 Syncro I have coolant temp sensors on BOTH sides of the thermostat and I can switch from one to the other with a toggle switch.

Excluding sitting at idle RPM with 0 MPH and NO ram air at the radiator, the thermostat must actually put the brakes on the coolant flow. On a 30*F day at 70 MPH the engine temp is at 190*F and coolant on the other side of the thermostat is ~45*F. If the T/stat didn't hold the radiator coolant back, the normal 4K RPM coolant pump volume would OVERCOOL the motor. All coolant pumps overproduce and it's the thermostat's job to limit the cooling ability by blending(recirulating) hot coolant with the cooled coolant returning from the radiator. This dual coolant sensor setup really showed me how effective the WBX cooling system is when it's free of defects.

Regards, John


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