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Make sure the heater control valve is closing. Unfortunately, that can be a difficult process and usually involves disassembling the heater assembly under the dash.

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โˆ™ 2006-03-04 16:01:31
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Q: What can be causing a 99 GMC Jimmy to be blowing hot air all the time after the actuator and the heater control assembly have been changed and the freon is good and the control valve is closing?
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