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This will be fine for the summer but what about winter when it's -15F outside and I'm driving down the freeway at 75 mph. Oh well, I guess I'll cross that bridge when I get to it.
This is one of the most misunderstood parts in the Volvo world. It is an emissions-control device, nothing more nothing less. The faster you warm the motor up to operating temp, the quicker the emissions settle down to desired levels. Any benefit to the driver by getting the engine warmed up faster is purely coincidental. There is no need for the warm air once the engine is operating at temp, and the continued operation of the flapper at this point is actually undesireable (colder, denser intake charge = a bit more power.)
I epoxied the flap shut in my 240 over 6 years ago, and I've never looked back. I used a sheetmetal screw through the backside of the airbox on my 940 to hold the flapper shut. This one's been going for 4 years like this. Having seen negative teens temperatures, and 70+MPH speeds on the interstate, quite a bit the past two winters, there were no drawbacks to the hot air deletion.
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Speed Racer, '83 240 R, '74 164 E, '93 940 OL1 (Manchester, CT)
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