Question about 2003 Chevrolet Silverado 2500HD

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Blows cool but looks like smoke through the vents, and is leaking in the cab onto the floorboards

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  • wvckimbo Jul 12, 2010

    My air conditioner is leaking onto floor in cab and blows steam through vents- but blows cool air. Steam sometimes smells like antifreeze and will make a hissing sound when I turn a corner

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If you can verify that it is definitely not antifreeze on the floorboards the evaporator core drain tube is plugged.It is located on the lower part of the firewall on the passenger side.I usually use a pick to dislodge the debris from the tube and get the ac draining properly again.This needs to be done carefully though as not to damage the evaporator core.
Freon boils into a gas as soon as it hits the air and almost looks like a fog.Unfortunately if it is freon coming out through the vents then the evaporator has hole in it and will need to replaced.Currently they do sell freons with sealers in them. I have not used any of these products to know how well they work but have been advised they can damaged an auto shops a/c machine by gumming the machines up.

Posted on Jul 13, 2010

  • Jonathan S
    Jonathan S Jul 13, 2010

    If it smells like antifreeze then the heater core is probably leaking.The heater core and evaporator core are pretty close to each other.

  • Jonathan S
    Jonathan S Jul 13, 2010

    Does it also do this when the heat is turned on?

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First of all get the coolant pressure tested.If the ac cooling gas freon os leaking then it might feel like smoke.At any local car garage get the ac pressure test checked.To confirm if the problem is due to freon leak. If pressure test checked ok.Then the other cause of smoke is.That the oil is burning in the engine when gets hot and that air is coming out from the ac vents in the car . Check the oil on the engine.maybe some oil was spilled on the engine block or somewhere and when the engine got up to temp it burned off. Other possibility to check the ac fan on the blower motor and radiator fan.Are this fan working properly.If not then this can be the reason.As the ac or thermostat gets hot after some time of ac going on then if the fan is not working this smokes comes out of ac vents.Check both the fans. Check the oil pressure sending unit above the oil filter, and the base of the oil filter as well. Please do rate the session positively after you end the chat session. There is a Red Cross mark button on lower right side to end the chat. End the chat and rate. Thanks .Bye.

Posted on Jul 12, 2010

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