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#1
09-03-2011, 03:13 PM
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A Quick cure for the Monovalve Blues
You say you can only get hot air out of your vents. You say your not sure if your A/C puts out like a highschool cheerleader. You say you think the A/C should be colder. You say a multimeter sounds too dangerous for you. One quick way to take the Monovalve out of the equation is at your handy-dandy local hardware store. Takes about 2 minutes to install in the summer and remove in the winter. A 1/4 inch U-bolt. It completely stops the flow of hot coolant to the heater core. For only $19.99 I'll send you this handy-dandy instruction booklet. Order now and I'll throw in a free bottle of DAWN detergent. If you have a diesel, you're gonna need it.
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 I LOVE CATS....AND FRIES 1981 300sd 1983 300sd 1985 300d 1983 300cd 1991 350sdl Last edited by netboy; 09-03-2011 at 03:59 PM. Reason: pics 
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#2
09-03-2011, 05:59 PM
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for 3.99, you can get a plastic hose pinchoff tool at most autoparts stores... it has a ratcheting handle lock... just a tad quicker... not as permanent though...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
09-04-2011, 10:13 AM
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Or get a shut-off ball valve at hardware store instead for about $4 and splice it inline with 2 hose clamps.
I find the 3/4" pex fittings match up very close to 5/8 heater hose.
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Cheers! Scott McPhee 1987 300D
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#4
09-04-2011, 12:54 PM
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Sorry you missed the humor in my post. Point is, there are a few cheap ways you can be assured that your cold a/c air is not competing with rogue heater core air when trying to get the most frost from your vents. Some jet skis come with a hose clanp to pinch off intake water that would work and mcphee's idea will work but it takes some cutting and fitting. I have a cpvc cutoff in my commuter car.
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I LOVE CATS....AND FRIES 1981 300sd 1983 300sd 1985 300d 1983 300cd 1991 350sdl
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