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What would happen if I connected my heater lines straight to and from the heater core instead of going through the heater control valve? I'll still be able to turn the heat off by moving the slider over to cold, no? The car used to have air conditioning, but doesn't now.
 

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My wifes (89 turbo Caravan) heater valve was leaking internally so a lot of the hot coolant was bypassing the heater core and she was complaining of little or no heat. I hooked up the lines directly to the heater core, Great heat now.
As far as controlling temperature, inside the "box" where the heater core is, there is a door the directs the air either through the heater core or around it, or any variable in between. I can turn the temp down on the controller and feel no heat at all.
I will probably put another control valve in after winter, just to make sure there is not any residual heat inside the van during the hot summer months.
 
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