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Old 04-18-2021, 05:43 PM
Jorn's Avatar
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HVAC Heater Control Mono Valve Bypass.

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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Black on Black 1979 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE
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Old 04-20-2021, 01:03 AM
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If I were you I would just put a manual ball valve between the engine and heater core. That way you can use heat and cold until you have time to fix it, but it wouldn't be a bad idea to keep the ball valve in place just in case anyways. I put mine in place years ago after my first heater core failure. I have the ball valve at one end and the monovalve at the other end to completely isolate the heater core incase of another failure.
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Old 04-29-2021, 03:10 PM
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Quote:
Originally Posted by Jorn View Post
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?

I presume you mean bypassing the heater core, which has near constant flow of hot coolant due to failed monovalve.


Quick and easy: Get a heater hose clamp-off tool from flaps, clamp off one of the rubber hoses to or from the heater core.


Proper repair - replace the monovalve.


Another idea: install a ball valve in the rubber hose on the driver's side, which is the feed line into the heater core.
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'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
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Old 05-07-2021, 11:38 AM
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It's fixed, it was the mono valve. The little metal filter inside was completely clocked by dirt and rust accumulated over the years. A good clean and all is working again as it should.

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