Live in HI and need to "just shut the heat off" for my wife, and thinking the easiest solution is to simply bypass the heater core so there isn't the low movement of hot air into the cabin. You guys have any other thoughts that might be even easier than plumbing an alternate coolant flow path? Also, an way to rig the vents to allow cool air to flow in all the time?

What's wrong with your ACC?

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1982 300CD Petrol/Black Leather

In HI you're never going to need heat, right? If so, a heater core bypass might be the cheapest and easiest fix for you. I have a wonky monovalve but I live in a place where sometimes I emphatically need the heater to work, and other times I pretty strongly want it to not work. I predict a ball valve from Home Depot is in my future.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

I recently test drove a 78 300D with a bypassed Servo. The owner had put a manual pull/push switch under the dash on the passenger side with a line going thru the firewall to a valve in the bypass hose so if you want heat just pull the knob and if you want no heat, push the knob to shut off the valve. For myself I live in Phoenix and heat is a meaningless waste of time to me so I'd probably just completely bypass the heater core entirely and be done with it.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

Good thoughts.. way easier than slogging through the climate control.

Why not just cut the inlet heater hose and put a shut off valve in the line?

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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