I have a 2001 Dodge Ram 1500-V6 Magnum..I had the water pump changed last year..And now when i turn on the heater it smells like antifreeze.Could this mean my heater core is bad?..And also when on defrost the air comes out the bottom.I did notice the a/c in the summer when i driving the air supply went crazy going from vent to the defrost on the dash.Give it gas and it went to the bottom.Let off went back to defrost vents.

SOURCE: Ford F150 2003 When I press the max cool on the AC the air comes out of the windshield defrost vent iinstead of the cabin vents and is not as cold as it use to be. Summer in Texas Help !

You did not mention if the system you have is electronic(digital control) or manual(control knobs) but what your problem is, is a vacuum leak. Defrost and heat or the default postions for no vacuum. If it works ok until you press max air Then you will need to check the outside blend door vacuum motor. It will be the white vacuum line going from the control head.

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Ronny Bennett Sr.

• 6988 Answers
• Posted on May 23, 2010

SOURCE: A/C not blowing thru vents just defroster and floor

It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars

SOURCE: 94 dodge ram 1500. during acceleration the air

You have a vacuum leak or the little valve in the vac line on the passenger side of the intake is bad