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1991 Mercedes Benz 300se

Tiny
MRDAN89
  • MEMBER
  • 1991 MERCEDES BENZ 300SE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 12,000 MILES
My heater is working erratically. It will defrost the windshield. But the cabin temperature does not reach the temperature that I set it at. The blower is fine but all I get is cool air blowing.
Sunday, February 15th, 2009 AT 8:32 AM

1 Reply

Tiny
GFIMOTORCARS
  • MECHANIC
  • 673 POSTS
Sounds like you may have a faulty heater exchange valve. When these fail coolant is restricted into the heater case producting merely cool air out of you a/c vents. The heater exchange valve is located on the firewall. Follow the heater hoses to the metal exchange block on the firewall.
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Sunday, February 15th, 2009 AT 5:43 PM

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