ir only comes thru defrost vents why?

Asked by May 24, 2018 at 05:08 PM about the 1997 Dodge Ram 1500

Question type: Maintenance & Repair

when air is on it only comes thru the defrost vents  why?

2 Answers


blend door actuator could have failed,also check vacuum lines down by gas pedal make sure you didn't kick them off.

1 people found this helpful.

Defrost is the "default/safety" setting for the HVAC. Your blend doors have to be powered to a vent or floor setting. You might also wanna check the 1way valve on the passenger side of the intake where the HVAC n cruise vacuum lines tap into the intake. If the 1way valve goes bad, the HVAC will default to the defrost, however, usually only on acceleration tho.

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