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Re: heater control valve / old or new[200/84] posted by Don Foster on
Tuesday, 1 May 2001, at 6:19 p.m.
Bruce --
The new style heater control valve was introduced into the 240 around '92, or so. It is a "gate valve," not unlike faucets in your house. The old style is a thermostatic control valve.
With the old valve, changing the temperature knob changed a temperature setpoint, and the thermostatic control system in the valve maintained that temperature by measuring the actual air temp (the little coil inside the blower).
With the new valve, changing the temperature knob simply opens or closes the valve.
If you buy the new valve from Volvo you get a retrofit kit. I've done one (an '89) and it was a minor pita job. The control cable must be changed, the mounting bracket is different, and both internal hoses are different (maybe only one). Plus the valve. And you get a rubber plug for the unneeded hole in the duct.
The new style valve works fine.
I'd say it's a 2-3 hour job. Expect a few scraped knuckles.
Don Foster (near Cape Cod, MA)