2000 S70 SE Base Air Intake Flap Topic is solved

[MoVolvos]

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Should the air coming from the exhaust tubing be closed at all times? If so how to close it?

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11-04 Air Box.jpg (558 KiB) Viewed 594 times

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[454cid]

My 96 was similar to what you show.... half open on both sides. I swapped in the lower box from a Turbo car that doesn't have that. I'm not opposed to having it functional, but I didn't know how to fix it. Mine didn't seem to want to come apart, and I didn't know what might actually be wrong with it. I do know that I don't seem to have any change in fuel economy now that I've run a number of tanks of gas through it. I have not yet checked the air filter to see if it's getting dirtier, now that the air is all coming from the front of the car.

[abscate]

It closes as the air box warms up. It is closed by vacuum , once the temperature in the air box climbs to a certain temperature ?????

The vacuum comes from two small white hard plastic lines that go from manifold to rear of the air cleaner box, then back down to the air door vacuum motor. The original kit is hard plastic white lines with small black rubber ends, these are often replaced with vacuum lines when the rubber ends degrade

[MoVolvos]

My 96 was similar to what you show.... half open on both sides. I swapped in the lower box from a Turbo car that doesn't have that. I'm not opposed to having it functional, but I didn't know how to fix it. Mine didn't seem to want to come apart, and I didn't know what might actually be wrong with it. I do know that I don't seem to have any change in fuel economy now that I've run a number of tanks of gas through it. I have not yet checked the air filter to see if it's getting dirtier, now that the air is all coming from the front of the car.

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I thought cool dense air was better for the car. I might block that off and see if there are any changes just in case it's not working. Don't like the idea of warm to hot air being drawn in from the exhaust, thanks!
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It closes as the air box warms up. It is closed by vacuum , once the temperature in the air box climbs to a certain temperature ?????

The vacuum comes from two small white hard plastic lines that go from manifold to rear of the air cleaner box, then back down to the air door vacuum motor. The original kit is hard plastic white lines with small black rubber ends, these are often replaced with vacuum lines when the rubber ends degrade

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So that's those 2 lines and it is rigged up with wires to keep them on at this time. Will check to see if they flow or not, thanks!
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[scot850]

It is to help with cold areas where the engines take a long time to warm up by channeling hot air from the exhaust manifold area into the engine. As the engine heats up the flap closes so only cold air is pulled in. 240's for example have a similar flap. The issue is that like all moving parts the thermocouple controller unit fails with age. The 240 one is replaceable, but I am trying to recall if you can modify the unit to work with the P80 version to replace it when it fails. I think I recall reading something about that long ago.

The Turbo engines had the SAS pump for a similar reason again as a way to heat reduce the emissions of a cold engine.

In warmer areas it may be of little value, but up here in winter it is a bonus in the NA cars by getting them up to temperature quicker and so warmer in the cabin quicker.

Neil.

[454cid]

I think it's also supposed to prevent icing on the throttle body. I'm not sure how much of a problem that would be, even in cold climates, Though. I live in MI, and I've never had an issue with icing on my truck and it doesn't have a system like this, or coolant in the throttle body like some vehicles do. Older carbed V8's always had a similar system, Though. My 69 Buick does and it's still connected. In fact, I've been contemplating repainting some of the parts.

[scot850]

Can't say I have had throttle body icing even at -40C. What we do get is intercooler icing which will prevent your turbo P80 moving! It makes more sense to retrofit the NA air box onto the turbo and find a what to route the hot air pipe to draw in warm air to melt the intercooler icing!

Neil.

[850oldschool]

My air box is wired in the open position. When the temp drops below -20F and I come off the freeway and stop at a light, the engine will usually be roaring away at around 3000 RPM for a minute or two. I'm thinking this is probably throttle body icing. It was pretty scary the first couple of times. I'm considering getting a second airbox with a functional thermostat and swapping when I do the seasonal tire change.

[454cid]

My air box is wired in the open position. When the temp drops below -20F and I come off the freeway and stop at a light, the engine will usually be roaring away at around 3000 RPM for a minute or two. I'm thinking this is probably throttle body icing. It was pretty scary the first couple of times. I'm considering getting a second airbox with a functional thermostat and swapping when I do the seasonal tire change.

I think if the door was working properly they're would be no reason to swap it out in the warmer months. Unless maybe you're thinking wear and tear?

I do miss the look of the hot air hose.... I was happy to have a nice looking original connecting the air box with the header shield. Now I just have the header shield elbow sticking up doing nothing, which does bug me a bit.

[454cid]

Can't say I have had throttle body icing even at -40C. What we do get is intercooler icing which will prevent your turbo P80 moving! It makes more sense to retrofit the NA air box onto the turbo and find a what to route the hot air pipe to draw in warm air to melt the intercooler icing!

Neil.

Maybe you're not getting enough moisture in the air to from ice at very low temps?