Hot air coming from my defroster vents even when blower is off. Ideas? Advice?

[spree17]

Hot air coming from my defroster vents even when blower is off.

The only way to stop it would be to open the front vents but then hot air comes from them? Any ideas what is happening and how to stop it? 1993 190e

[bazzle]

Prob has a stuck Duo Valve. Give it a tap to confirm. Default position is open .(hot)

Bazzle

[spree17]

Originally Posted by bazzle

Prob has a stuck Duo Valve. Give it a tap to confirm. Default position is open .(hot)

Bazzle

Thanks a bunch for the reply. I dont know what a duo valve is or where it is located so can you help me out again. Then I can tap it.

[865sp300e]

Originally Posted by spree17

Thanks a bunch for the reply. I dont know what a duo valve is or where it is located so can you help me out again. Then I can tap it.

Not sure your car but mine is next to the battery, follow the heater hose from the engine, it will connect to a small recirculation pump by the wheel well and then to the valve in question.

[spree17]

Originally Posted by 865sp300e

Not sure your car but mine is next to the battery, follow the heater hose from the engine, it will connect to a small recirculation pump by the wheel well and then to the valve in question.

My car is a 1993 190e. Thanks for the advice. I will try to find it.