No hot air coming from the center console vent?

Tiny
SUHAILKADER
  • MEMBER
  • 1996 MERCEDES BENZ S320
  • 3.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 286,838 MILES
Replace entire heater assembly, but hot air does not come out of center dashboard heater vent. Left and right vents a working but hot air flow is not optimum level.
Work history: bypassed heater control valve and directly connected hose to the water pump. The other 2 hoses are closed by using stopper.

Looking forward for some suggestions.
thank you
Friday, January 19th, 2024 AT 11:18 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 44,365 POSTS
Are you getting vacuum to the main air flap when the HVAC is in the face vent setting? Also, there is a main air flap upgrade. If you are not getting vacuum to the main air flap but you have vacuum to the other flaps, then the main HVAC controller has gone out or the line has a break in it. Here are diagrams of the system so you can check it out. Make sure you have vacuum to the main control head as well. Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.
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Sunday, January 21st, 2024 AT 9:59 AM

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