on the dash below the windshield.
the defrost vent should just pop out by taking a screw driver underneath the sides of the vent cover and prying it up.
The center vent, or defrost duct.
To replace the defrost vent on a Chevy S10, first, disconnect the battery and remove any necessary trim pieces from the dashboard to access the vent. Next, detach the old vent by unscrewing or unclipping it from the ductwork. Install the new vent by securing it in place and reassembling any removed components. Finally, reconnect the battery and test the defrost function to ensure proper installation.
my 1998 gmc jimmy has no floor heat but i have defrost and ven heat
The fastest way to defrost a windshield is to turn the defrost vent on without heat or simply open the windows. Another option is to warm the inside of the car by turning the heater on.
When there is a problem with the vent system it dfaults to the defrost setting. Sounds like you have a problem in the doors that direct the air flow.
The vent door actuator is operated from the engine vacuum. If the vent control doesn't respond to your demand check the vacuum supply line from the engine, it may be damaged or disconnected. Do this before you tear apart the dash and HVAC box.
The most common thing will be that you have a leaking heater core...........
Check for a vacuum leak either under the hood or under the dashCheck the vacuum actuators under the dashCheck the selector control Defrost is the default for this system
The AC on a 1998 Dodge Ram 1998 will only be blowing out the defrost vent if the air handler is not set properly. This can result from a piece of debris getting stuck or a faulty flap.
the ducts can not be hooked up for the vents to work
You have a leak in the vacuum supply to the ac control.