Since a couple of days I have constant heat coming out of the dash vents. Not much time and desire to tackle it at the moment. Was thinking of bypassing the Mono Valve in the meantime, it's getting hot here and don't think I will use the heater anytime soon. Seems to be straight forward, from pipe to pipe in the engine compartment.

Anything I should be aware of or have to take care off?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).