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Hi
I get a draft of cold air in driver side foot well .This happens when Recirculate button is on. I have checked the on way valve at the intake manifold and it works fine . I am wondering if the mechanism closing the inflow of outside air is compromised in some way . Where is the location of the duct which takes air from outside . I have removed glove box , instrument cluster so that I can have some glimpse of that duct but it has not helped . So where is it located .
Regards
Gopesh
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DD-1990 240 DL SW M47II FI 3.1 220 K miles Turbo Sways,Custom headlight circuit ,Insulated roof,Tinted Glass,
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If you remove the plastic panel covering the fuse panel area, you'll see a plate covering the air vent opening which was used on earlier models. The earlier models had a lever which extended through the plastic panel allowing you to open the vent and get cool air to your feet and legs. The cover over the vent opening on newer models was sealed with several screws and sealing compound. Maybe a previous owner has opened up the cover. Normally, air pressure from the heater would keep much cool air from coming out the side vent. When you use the recirculate option, the air pressure from the heater drops allowing cool air to enter from the side vent.
You need to take off the side panel and check to see if the side vent is closed off as it should be.
I liked the side vent in the summer so I went to a salvage yard and pulled off a side vent with lever and plastic panel from an older 240. I then installed this in my newer 240. It worked fine and was not a hard job to do.
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Did you check the fresh air vent on the left side behind the fuse box? It has it's own lever, and is seperate from the heater system.
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Lee 75 244 (80k original miles) 79 242 65 220 project
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Air comes from the small grill which is just ahead of the fuse box cover. I have removed the whole fuse panel number of times but have not noticed any lever or vent there . Is this fresh air vent supposed to be in 1990 200 SW as well. I will check again that area.
Regards
Gopesh
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DD-1990 240 DL SW M47II FI 3.1 220 K miles Turbo Sways,Custom headlight circuit ,Insulated roof,Tinted Glass,
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My '86 had the vent. My '89 does not.
As I recall the lever is forward of the fuse panel, at the grill.
The plastic panel is removable if you need to get inside to look.
Since I'm pretty sure the '90 did not have the vent - -
My guess is that a previous owner wanted the vent that was not present in the '90 car. So made a cut in the metal to allow the air to flow. I believe the vent system uses a "natural" channel in the body sheet metal. Cutting an opening in the right spot gives you a vent. It is fed using air from the grill vents below the windshield. Covering it with duct tape or a flat panel glued down will probably close it off successfully.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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Thanks May be that is the issue . I will check that . Since I invested some time trying unsuccessfully to locate the air intake of heating/cooling system I would like to know where is the flap located which is operated by re-circulate button.
Regards
Gopesh
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DD-1990 240 DL SW M47II FI 3.1 220 K miles Turbo Sways,Custom headlight circuit ,Insulated roof,Tinted Glass,
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My understanding is, all air for cabin ventilation comes from the slots in "cowl" area below the windshield. Air coming back across hood hits the windshield and builds a high-pressure cushion there at the slots. This is why air flows in the ventilation system without fan at about 40 mph +.
This air supplies the blower system (all the regular vents) and also feeds a sheet metal chamber that extends to where that "ankle" vent is, by the fuse panel. Manual for '83 240 says some '83s had a matching ankle vent for passenger so that would make sense - same sheet metal design on both sides of car.
Same chamber also supplies the heater/ac/blower/vent/front defroster system. Not sure exactly where the chamber outlet is for that but my guess is it has to be near the blower + vent ducts, behind center console under the dash.
Reason I think so - in my '86 with driver's ankle vent, I learned that opening or closing the vent changed the amount of air available to the blower ventilation system. If vent was open, blower system and all it's vents got less air. If ankle vent was closed, blower system vents had more air. Easy for me to "see" due to many long drives, many hours using heat and a/c and just plain air. So I deduced it's one air source feeding both systems - the ankle vent and the blower system with its vents.
Sorry I don't have the answer to your question re. location of damper for the "recirculate" function. Has to be up behind the dash. You need a really intelligent four year old kid who will explore there and then draw you a map (just kidding of course).
Lastly, why did they discontinue it and why no right side ankle vent on cars with a left side vent? Vent sometimes leaks/blows water. Some important electronics on the right side, better to keep it dry. Maybe carburetor cars had the right side vents; no Bosch electronics there. I think water problems finally killed the ankle vent for all the 240s. Relays on the kick panel and also under the driver's left foot in small chamber; better to keep it all dry.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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Thanks ,I located one circular hole on fire wall which seems to be covered with galvenized sheet of steel. The clutch pedal mounting bracket secures this sheet to firewall . I tightened the nuts may be that will help.
I think I found air intake .It is on the top of heater core .It opens within the slots in the cowl.It is quite difficult to reach the mechanism which operates the flap for recirculate button without opening the dash.I will live with the whatever fresh cold air is coming.
I have put a whaler 92 c thermostat, lets see if it improves fuel economy.I also learned that one should never put leak stop in cooling system .The pipe which emerges from bottom of coolant reservoir was comletely blocked.
Regards
Gopesh
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Footwell vents come, and footwell vents go.
When K-Jet got Lambda, they put the brain where the passenger footwell vent is. The ECU continued on there when LH-Jet came along.
Cars without FI (to wit, B21A, B23A, B230K, D24) have no ECU and therefore do have a passenger footwell vent. My '84 D24 245 does. Also, a few K-Jet cars pre-lambda have no ECU and therefore have the vent.
The driver's side vent was fairly constant, 75-89. With the changes for 1990 that added SRS, all footwell vents were gone.
Adding a passenger footwell vent to a pre-90 car isn't particularly tough. Get the plastic panel and metal vent from a car so equipped. Remove existing kickpanel. Relocate ECU to firewall. Install new parts/
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