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Marty
Marty, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 53984
Experience:  Bosch Certified Master Technician with over 35 years experience in the automotive industry.
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When I try to use heater air con iget no air trough center

Resolved Question:

when I try to use heater air con iget no air trough center vent and no air trough lower vents. I have replaced dash control moduel. air control unit under paserger air bag unit
Submitted: 1 year ago.
Category: Mercedes
Expert:  Shantal-Mod replied 1 year ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
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Shantal
Customer: replied 1 year ago.
Hi I have not had any response to my question . I have emailed more information to help the mechanic but still no reply
Expert:  Shantal-Mod replied 1 year ago.
Hello,
Thank you for getting back to me and apologies that you have not received an answer yet. We have a range of Professionals online all the time. However specialties differ, and we are searching for the right professional to assist you.
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Shantal
Expert:  Shantal-Mod replied 1 year ago.
Hello,
I apologize as we have not yet been able to find a Professional to assist you. Do
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Expert:  Marty replied 1 year ago.
Hi, I apologize for the long wait on this question. If the only vents that are working are the defroster vents I would suggest you test the vacuum supply to the vacuum switching valve behind the air bag. If you have inadequate vacuum to the valve the vents remain in defrost mode and will not switch. You should have at least 16" - 18" of vacuum to the valve at idle.Let me know if you have any questions. Please remember to rate my service in order for the website to credit me for taking your question.Marty
Marty, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 53984
Experience: Bosch Certified Master Technician with over 35 years experience in the automotive industry.
Marty and other Mercedes Specialists are ready to help you