'73 heater bypass valves?
Thread Starter
Heel & Toe
Joined: Feb 2010
Posts: 20
Likes: 1
From: fort worth tx
'73 heater bypass valves?
Recently purchased a '73 and noticed there were standard plumbing type "shutoff" valves midway on the heater hose coming from the water pump, and the other off the intake manifold. I realize these were likely placed there to keep heat away from the passenger compartment, but can I shut these both to off? And if so, will water continue to circulate from engine to radiator with these two hoses blocked off?
To be clear, there is no bypass between these two valves that would allow the water to bypass the heater core. These two valves are independent of each other.
As always....thanks!
To be clear, there is no bypass between these two valves that would allow the water to bypass the heater core. These two valves are independent of each other.
As always....thanks!
Race Director
Joined: Jul 2004
Posts: 12,706
Likes: 329
From: Scottsdale Arizona
Other than the lack of heat to the heater core, this will not have any effect on cooling. You may find if you open the valve that your heater core leaks. This is very common and also a very unpleasant repair.
Race Director
Joined: Jul 2004
Posts: 12,706
Likes: 329
From: Scottsdale Arizona
Instructor
Joined: Dec 2002
Posts: 222
Likes: 0
From: Leander TX
Even with just one side open.. the heater core will eventually get some heat.. close them both. Napa sells a heater valve (i think for an Explorer) that will not only close both sides.. but allows coolant flow as a bypass between hoses when closed. 
Here is the napa part number # BK 6601294
Hey.. I'm in Leander as well..
-Frank
Here is the napa part number # BK 6601294
Hey.. I'm in Leander as well..
-Frank
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