1991 MERCEDES BENZ 300SE

  • Tiny
  • mrdan89
  • 1991 Mercedes Benz 300se

Heater problem
1991 Mercedes Benz 300se 6 cyl Two Wheel Drive Automatic 120, 00 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.

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Sunday, February 15th, 2009 AT 8:32 AM

1 Reply

  • Tiny
  • gfimotorcars
  • Expert
  • 681 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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