heat/air

1991 MERCEDES BENZ 300SE
290,000 MILES
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RACHELLEDEARMON
  • MEMBER
  • 1 POST
First off when it was cold cold air came out for heat then when it got hot no air is coming out replaced motor fuses relay climate control and heater regulator when I hooked it up to the battery the motor came on what would keep heat and air from working
Apr 14, 2013 at 9:49 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
If the blower motor is working and you cant change between heat and cool, it sounds like the blend air door is stuck or broken. It is located near the heater core and based on its position, allow air to either flow past the heater core or the AC. Check that and let me know what you find.
Apr 14, 2013 at 1:10 PM
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