Climate con. vacuum issues

[Rickysa]

I have a passenger side airbag, which complicates things a bit

Just replaced monovalve, so I have cold air now...but...

Now I have full time defrost, no "leg room" air. I've got vacuum at the switch block (check valve is good)

I don't believe the vacuum diagram on the CD's is the same for my car? as the red/yellow (which should control the leg room flap) controls the dash vents.

When bi-level heat is selected, vacuum should be pulling on "leg room" only....air coming out legs and defrost (as defrost is closed only when under vacuum), I get no vacuum from any of the 7 ports.

Anybody else fought this monster?

Rick

[Teutone]

This issue has been discussed extensively, try a forum search

[Rickysa]

Originally Posted by Teutone

This issue has been discussed extensively, try a forum search

I have...it is a vacuum issue...I cannot access the componets as easily (or at all) since I have a passenger side air bag. I was hoping to hear from someone that has had a similar issue, and if they determined if it was the switch block, or not.

Believe me, I am sure to do a "forum search" before I ever post, having been chastised in the past. Perhaps, I am doing so incorrectly. I joined this forum (and supported it w/ $) hoping to get advice from helpful folks and not getting my hand slapped every time I ask a question. It seems I may have been in error.

If anyone can do a proper search, and point me to the thread that addresses this issue, I will be quite greatful so that I do not take any more time of the moderators.

Rick

[Teutone]

Rick, this is not personal.
It does get annoying for mods to have to point out the search function 20+ times a day, even if only to be able to ask a more specific question.
The welcome tutorial sticky, some members can't be bothered to read, even suggests to google a question, often a short cut to the specific benzworld post.
The heating/climate control section of the service CD's is huge, pick a file, and I post it later tonight
83 Climate Control System

General, Technical Data

* Introduction - Service Manual Automatic Climate Control Model 126
* 00 index - General technical data 00
* 00-005 - Instructions for use of service manual
* 00-010 - Model and system identification
* 00-015 - Vehicle identification number locations

Section I - Heating and Ventilation

* 83-110 - Removal and installation of heat exchanger
* 83-120 - Removal and installation of heater blower
* 83-122 - Removal and installation of air jet nozzle
* 83-125 - Removal and installation of pre-resistance group
* 83-130 - Removal and installation of interior temperature sensor
* 83-135 - Removal and installation of temperature sensors for heat exchanger
* 83-137 - Removal and installation of electronic switching unit
* 83-140 - Removal and installation of cover on air intake
* 83-142 - Removal and installation of surface heat exchanger for windshield glass heater
* 83-144 - Removal and installation of thermo valve for windshield glass heater
* 83-150 - Removal and installation of venetian blind with frame in center of instrument panel
* 83-160 - Removal and installation of venetian blinds at end of instrument panel
* 83-163 - Removal and installation of vacuum reservoir
* 83-165 - Removal and installation of vacuum elements for main air flap
* 83-170 - Removal and installation of venetian blinds with frame at rear of center console

Section I - Air Conditioning

* 83-502 - Refrigerant circuit
* 83-514 - Refilling or replenishing air-conditioning system
* 83-516 - Draining of air-conditioning system
* 83-520 - Checking oil level in refrigerant compressor
* 83-522 - Removal and installation of refrigerant compressor
* 83-524 - Reconditioning of refrigerant compressor
* 83-526 - Removal and installation of electromagnetic clutch
* 83-528 - Removal and installation of condenser
* 83-530 - Removal and installation of receiver dehydrator
* 83-531 - Checking, removing and installing pressure switch in receiver dehydrator
* 83-532 - Checking, removing and installing temperature switch in receiver dehydrator
* 83-534 - Removal and installation of expansion valve
* 83-536 - Removal and installation of evaporator housing with heater box
* 83-538 - Removal and installation of evaporator
* 83-546 - Removal and installation of auxiliary fan

Section II - Automatic Climate Control

* 83-600 - Operation of automatic climate control system
* 83-601 - Manual and optical function test of automatic climate control
* 83-602 - Preparations for testing, connecting adaptor to Volt/Ohm measuring equipment
* 83-603 - Function test of total system and remedies (with adaptor)
* 83-604 - Vacuum function diagram
* 83-607 - Output test
* 83-614 - Preparations for vacuum test
* 83-615 - Testing check valve and vacuum resevoir
* 83-620 - Testing vacuum circuit I, II and III
* 83-622 - Testing vacuum circuit IV, V, and VI
* 83-624 - Testing vacuum circuit VII and VIII
* 83-625 - Removal and installation of monovalve
* 83-628 - Testing of switchover valves
* 83-630 - Removal and installation of recirculating pump
* 83-635 - Removal, installation and assembly of control unit
* 83-640 - Removal and installation of in-car temperature sensor
* 83-645 - Removal and installation of temperature sensor for heat exchanger
* 83-650 - Removal and installation of ETR-switch
* 83-660 - Removal and installation of switchover valves
* 83-665 - Removal and installation of vacuum elements
* 83-675 - Removal and installation of electronic switchgear for temperature control
* 83-676 - Removal and installation of electronic switchgear for blower control
* 83-677 - Removal and installation of heat exchanger
* 83-678 - Removal, installation and checkup of temperature switch for cold engine lock

[Rickysa]

Teutone,

Yes, I'm glad it isn't personal, and I thank you for the offer, but I have the CDs and have spent the last two days pulling everything apart and troubleshooting evertything I can reach. I only have a vacuum reading tool, not one that can pull a vacuum (although I have tried to find one locally), so I cannot do the "Test Vacuum Circuit" (620, 622, 624).

Following the vacuum diagrams, and setting the controls to test the vacuum element to open the leg-room flaps (selection "c", heating) shows no vacuum on any of the switchover valves....so no vacuum to open the leg-room flaps, or any vacuum to close the defroster flaps.

I cannot get to the vacuum elements (due to the airbag), only the switchover valve block...so is it the valve block, the vacuum elements, or the climate control console?

Hence my question as to anyone else having this problem, with a passenger airbag, and possible solutions.

Rick