1990 Mercedes Benz 420sel Repair Question
Topics covered: Heater, Heater core, Door.
Mileage: 174,500 miles.
Mileage: 174,500 miles.
Asked on August 6, 2011
Heater
I have a 1990 Mercedes 420 SEL and the a/c works fine, but in the winter the heat blows ice cold air. What could be the cause of this.
Asked by dcarlisle411@gmail.comAnswer
Replied on September 23, 2011
With the engine hot and the heater on, feel both heater core hoses at the firewall. If both are hot, check and repair blend air door. If only one gets hot, chances are the heater core is plugged. Try back flushing core to clean it.
