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My heat is on so matter what setting I use. Even when the system is turned off the heat is there. AC works but can't overcome the heat. Can I clamp one of the heater hoses or does that block the entire coolant system?
 

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heat should be on all the time in the heater core, there are then vents to either block or allow the heat, if these stuck open you cant control the air passage trough the air box and can get hot air coming out.
 
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