Why does air blow through the defrost vents?
When you place the Climate into AUTO it opens the center flap and a refresh/recirc flap, but the refresh/recirc flap closes after a min, that’s why you get air through the center vent for a min while you center flap is stuck closed.
How to open the vents on a Mercedes Benz?
cheap fix for now… remove the under dash on the passenger side – you will see two bellows in the console, pull the one closest to the firewall toward the passenger side, then pull down, this will manually open the dash vents. disconnect the vacuum line from the bellow and cap it. this will give you dash AC until you remove the dash.
How do you put the vents back into the dash?
Putting them back into the dash is a major PITA. You have to reach in and with your hand at odd angles you have to feel your way to put the metal arm back onto the plastic tab for the vent flap. The center vent bellow has a metal support and I had to bend it a little to put the bellow back onto it.
Which is the defrost position on a Mercedes Benz?
Usually, the default, no vacuum position is the defrost position. My guess would be it’s the vac reservoir that was described previously. I just repaired my center vent problem this weekend and what a PITA it was. Zade Faraj’s link With this post helped me start off.
How does the air vent work on a defroster?
The vent control system for the defroster in integrated into the operation of all temperature controls and uses forced air provided by the blower motor. On newer cars the vent direction and temperature controls are operated by a series of 3 or 4 electrical actuator motors which are adjusted by the climate control module.
Where is the defroster located in an air conditioner?
The defroster is part of the heater and air conditioner system which is housed inside of the heater plenum. The vent control system for the defroster in integrated into the operation of all temperature controls and uses forced air provided by the blower motor.
Where does the vacuum line from the defroster go?
Vacuum lines travel from the vacuum control switch on the dash to vacuum servos under the dash. These servos move the air doors which turn on and off the defroster. If you can hear a hissing sound when the car is running from under the dash then vacuum is escaping.
Where can I buy nostalgic AC under dash vents?
The UD (under dash) vent panels we sell are made in house by Nostalgic AC, we are always developing new products so if you are interested in a design that is not on the website please ask, it might be available. The under dash pods are an easy way to add a vent, controls, and any other accessories for the inside of the vehicle.
Why does my C280 blow air from the vents?
My C280 seems to have developed a bad actuator motor MB calls it a stepper motor in the plumbing vent work. All air blows from defrost and side vents.
Why does my Chevy Cruze not blow on defrost?
blower motor blows hot air but no longer blows on defrost… 2013 Chevy Cruze LT RS. Defroster stopped blowing up onto the wind shield. Air gets hot and will blow either onto the floor or onto you and when defrost is selected it just blows onto you, not up onto the windshield anymore. This all happened about a week ago.
Why are the vents on my car not blowing air?
I just bought a new climate control box and installed it, but it did not fix the problem. That is, the light behind the blower knob still does not illuminate and, the center and windshield vents do not blow air when the blend selector knob on the right end is adjusted (see photo).
Why does my car blow hot air when defrost?
Air gets hot and will blow either onto the floor or onto you and when defrost is selected it just blows onto you, not up onto the windshield anymore. This all happened about a week ago. The car was just at Andy Mohr Plainfield last month for an oil change.
Why does AC stop blowing out the defrost vents?
After installing a new blower fan motor the ac would only come out the defrost vents. The factory vacuum check valve is very hard to get to. So i bypassed it. Now it is working like it should and ac comes out the dash vents. I do not have a vacuum reservoir installed i will have to see if i will need to add it later.
Can a defrost fan blow to the floor?
Fan Only Blows Defrost, Won’t Change To Floor Or Vent. I discovered today that I only receive air through the defrost vents. tried to change it to the floor or the dash vents, no deal.
Is the Astro fan only blows defrost?
Re: Fan Only Blows Defrost, Won’t Change To Floor Or Vent. Yea the problem with them astro’s is the way the damn motor is crammed into the dog house with the heat it destroys the hard plastic vacume line . I have had 5 of them and every one had this problem until you change them out with rubber lines .
What to do if your GM fan won’t defrost?
See if this fixes the problem. Many of GM’s AC control heads have a built in reset feature that when power is removed and then applied it will go through a cycle that activates all the vent doors and mode doors. It’s worth a try.