Question about 2001 Chevrolet Corvette

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No defrost. heater and vent control work. 2004 c4

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Check for stuck vent door or door acuator motor

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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1 Answer

My windows are not defrosting properly.


Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.

Feb 20, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

How to repair


i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

04 Buick Regal Heater blows cold And will not cycle on defrost,floor or vent


if it doesnt switch you may have a vaccum leak, but i work for a junk yard and we seel alot of heater controls for this car you may want to get a new or used one from a junk yard

Mar 26, 2012 | 2004 Buick Regal

1 Answer

Blower fan only works for defroster , when i switch to other vents it only comes out of defroster


heater control flap is stuck or disconnected. under passenger side dash.

Nov 06, 2010 | 2004 Ford F250

1 Answer

The vent function no longer works, i.e. won't blow


manual or electronic heater/A/C controls?

Could be loose vacuum harness on back of control head. Need to put 10" tie straps on to hold it tight to control head.

May 09, 2010 | 2004 Mercury Grand Marquis

1 Answer

Only blowing through defrost vents


defrost is fail safe mode. cehck for a broken vacuum line from the engine to the heater control head. check vacuum reservoir under hood for leaks.

Oct 04, 2009 | 2004 Ford F250

1 Answer

Problem with air not coming out of vents.


Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.

Jun 08, 2009 | 2004 Ford Ranger

2 Answers

Heater/AC only blowing out of defroster vents


vacume hose off or cracked it wont change to floor heat ooorrr field mice have made them selves a home in your heater box

Dec 12, 2008 | 2004 Jeep Wrangler

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