Mode door Actuator
Thread Starter
|
Starting Member
Joined: Aug 2010
Posts: 196
From: St Louis
Mode door Actuator
2003 ZR2
Was driving today with the defrost on. Then all of a sudden it switched to blowing out the face vents. Checked the T under the hood. Has good vacuum there. Lowered the glove box and unplugged the first visible vacuum line harness. Had vacuum there. No matter which mode I select, it only blows at your face. Where should I check next?
Was driving today with the defrost on. Then all of a sudden it switched to blowing out the face vents. Checked the T under the hood. Has good vacuum there. Lowered the glove box and unplugged the first visible vacuum line harness. Had vacuum there. No matter which mode I select, it only blows at your face. Where should I check next?
I'll pull the surround off tomorrow and check it out.
Thread Starter
|
Starting Member
Joined: Aug 2010
Posts: 196
From: St Louis
Well it is too freakin cold to work on it today. I do have an update though. It turns out the actuator is moving and switching but most of the air flow still comes out the face vents. If I close them off manually at each vent, it gets stronger where ever I have the flow directed to. What's the deal? I figure I will need to pull the carrier?
Thread Starter
|
Starting Member
Joined: Aug 2010
Posts: 196
From: St Louis
Tried evader's fix. Didn't work.
Pulled the controller and listened for it switching. It is switching vacuum.
I did find this TSB but I don't see or feel any oil in the tubing. What should my next step be?
EDIT: I want to look to see if all the actuators are moving. Where are they all located or how can I get the best view of them?
Pulled the controller and listened for it switching. It is switching vacuum.
I did find this TSB but I don't see or feel any oil in the tubing. What should my next step be?
QUOTE ("GM Data")
01-03 Chevrolet Blazer, S-10, GMC Envoy, Jimmy, Sonoma with 233E Transfer Case: Oil in HVAC Vacuum Lines: Supplement to 03-01-38-009 - kw 4WD AC case contaminated contamination control head mode #PIT3153 - (Sep 3, 2004)
01- 03 Chevrolet Blazer, S-10 GMC Envoy, Jimmy, Sonoma with 233E Transfer Case Oil In HVAC Vacuum Lines Supplement to 03-01-38-009
.
The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.
Condition/Concern:
HVAC mode switch is inoperative or is stuck in vent mode. After some diagnosis, oil in HVAC control head and/or vacuum lines may be discovered.
Recommendation/Instructions:
Replace all contaminated parts in HVAC system, as well as the transfer case vacuum switch. The transfer case vacuum switch is located on the transfer case. The following should also be inspected:
1. Verify that transmission and transfer case vents are working properly and are not clogged.
2. Visually inspect for transmission to transfer case seal damage.
3. Adaptor plate that mounts the transfer case to the transmission mounted incorrectly.
If any of the above conditions exist, please repair as necessary. Any of the three conditions listed above could cause the transfer case vacuum switch seal to fail. Any of these three conditions may cause pressure to build in the transmission or transfer case. When the transmission or transfer case heat up, the oil expands and finds its way into the vacuum switch. This oil expulsion causes the vacuum switch seal to fail and allows transfer case oil to be drawn into the HVAC vacuum lines. The Transfer Case Vacuum Switch has been revised. As of 08/04/04 this new switch has been used on production vehicles built at the Linden plant. The revised switch part number is listed below.
Parts Information:
Part Number Description
89059420 Switch - Transfer Case Vacuum
.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.
Models:
(2001-2003 Chevrolet Blazer, S10) and (2001[shy ]2003 GMC Sonoma) and (2001 GMC Envoy, Jimmy ) and (2001[shy ]2003 GMC Jimmy (Export Canada Only) (with 4WD and Two-Speed Electric Shift Transfer Case (RPO NP1)
and
QUOTE ("GM Data')
HVAC Mode Switch Inoperative or Stuck in Vent Mode, Oil in HVAC Control Head and/or Vacuum Lines (Replace Transfer Case Vacuum Switch and Contaminated HVAC Components) #03-01-38-009 - (Jun 25, 2003)
HVAC Mode Switch Inoperative or Stuck in Vent Mode, Oil in HVAC Control Head and/or Vacuum Lines (Replace Transfer Case Vacuum Switch and Contaminated HVAC Components)
2001-2003 Chevrolet Blazer, S10
2001-2003 GMC Sonoma
2001 GMC Envoy, Jimmy
2001-2003 GMC Jimmy (Export Canada Only)
with 4WD and Two-Speed Electric Shift Transfer Case (RPO NP1)
Condition
Some customers may comment that the HVAC mode switch may be inoperative or stuck in the vent mode. After some diagnosis, oil in the HVAC control head and/or vacuum lines may be found.
Cause
When the transmission or transfer case heat up, the oil may expand and find its way into the transfer case vacuum switch. This oil expulsion may cause the vacuum switch seal to fail and allow transfer case oil to be drawn into the HVAC vacuum lines.
Correction
Replace the transfer case vacuum switch. Refer to the Transfer Case Vacuum Switch Replacement procedure in the Transfer Case sub-section of the Service Manual. Also, replace all contaminated parts in the HVAC system.
Parts Information
Part Number
Description
15664811
Switch -Transfer Case Vacuum
Parts are currently available from GMSPO.
01-03 Chevrolet Blazer, S-10, GMC Envoy, Jimmy, Sonoma with 233E Transfer Case: Oil in HVAC Vacuum Lines: Supplement to 03-01-38-009 - kw 4WD AC case contaminated contamination control head mode #PIT3153 - (Sep 3, 2004)
01- 03 Chevrolet Blazer, S-10 GMC Envoy, Jimmy, Sonoma with 233E Transfer Case Oil In HVAC Vacuum Lines Supplement to 03-01-38-009
.
The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.
Condition/Concern:
HVAC mode switch is inoperative or is stuck in vent mode. After some diagnosis, oil in HVAC control head and/or vacuum lines may be discovered.
Recommendation/Instructions:
Replace all contaminated parts in HVAC system, as well as the transfer case vacuum switch. The transfer case vacuum switch is located on the transfer case. The following should also be inspected:
1. Verify that transmission and transfer case vents are working properly and are not clogged.
2. Visually inspect for transmission to transfer case seal damage.
3. Adaptor plate that mounts the transfer case to the transmission mounted incorrectly.
If any of the above conditions exist, please repair as necessary. Any of the three conditions listed above could cause the transfer case vacuum switch seal to fail. Any of these three conditions may cause pressure to build in the transmission or transfer case. When the transmission or transfer case heat up, the oil expands and finds its way into the vacuum switch. This oil expulsion causes the vacuum switch seal to fail and allows transfer case oil to be drawn into the HVAC vacuum lines. The Transfer Case Vacuum Switch has been revised. As of 08/04/04 this new switch has been used on production vehicles built at the Linden plant. The revised switch part number is listed below.
Parts Information:
Part Number Description
89059420 Switch - Transfer Case Vacuum
.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.
Models:
(2001-2003 Chevrolet Blazer, S10) and (2001[shy ]2003 GMC Sonoma) and (2001 GMC Envoy, Jimmy ) and (2001[shy ]2003 GMC Jimmy (Export Canada Only) (with 4WD and Two-Speed Electric Shift Transfer Case (RPO NP1)
and
QUOTE ("GM Data')
HVAC Mode Switch Inoperative or Stuck in Vent Mode, Oil in HVAC Control Head and/or Vacuum Lines (Replace Transfer Case Vacuum Switch and Contaminated HVAC Components) #03-01-38-009 - (Jun 25, 2003)
HVAC Mode Switch Inoperative or Stuck in Vent Mode, Oil in HVAC Control Head and/or Vacuum Lines (Replace Transfer Case Vacuum Switch and Contaminated HVAC Components)
2001-2003 Chevrolet Blazer, S10
2001-2003 GMC Sonoma
2001 GMC Envoy, Jimmy
2001-2003 GMC Jimmy (Export Canada Only)
with 4WD and Two-Speed Electric Shift Transfer Case (RPO NP1)
Condition
Some customers may comment that the HVAC mode switch may be inoperative or stuck in the vent mode. After some diagnosis, oil in the HVAC control head and/or vacuum lines may be found.
Cause
When the transmission or transfer case heat up, the oil may expand and find its way into the transfer case vacuum switch. This oil expulsion may cause the vacuum switch seal to fail and allow transfer case oil to be drawn into the HVAC vacuum lines.
Correction
Replace the transfer case vacuum switch. Refer to the Transfer Case Vacuum Switch Replacement procedure in the Transfer Case sub-section of the Service Manual. Also, replace all contaminated parts in the HVAC system.
Parts Information
Part Number
Description
15664811
Switch -Transfer Case Vacuum
Parts are currently available from GMSPO.
EDIT: I want to look to see if all the actuators are moving. Where are they all located or how can I get the best view of them?
Last edited by stlwaco; Dec 15, 2010 at 11:55 AM.
Thread Starter
|
Starting Member
Joined: Aug 2010
Posts: 196
From: St Louis
If the controller is the problem and I unplug the vacuum harness from it, should the doors go back to default defrost?
Update: I just took out the hush panels. Found all the actuators. I had no reaction from any of them if I manually moved the linkages except one. If I pushed it out it would shut off air flow to the face vents and all the others would act properly. So the door is free but the actuator is trash. Gotta find one now. Bad news is the whole dash has to come out to do it. Good news is, I can knock this and the heater core out.
Anybody know the part # for the upper actuator on the driver side of the console?
Update: I just took out the hush panels. Found all the actuators. I had no reaction from any of them if I manually moved the linkages except one. If I pushed it out it would shut off air flow to the face vents and all the others would act properly. So the door is free but the actuator is trash. Gotta find one now. Bad news is the whole dash has to come out to do it. Good news is, I can knock this and the heater core out.
Anybody know the part # for the upper actuator on the driver side of the console?
Last edited by stlwaco; Dec 16, 2010 at 03:15 PM.
Thread
Thread Starter
Forum
Replies
Last Post
BlackFireLS4.3
Engine & Transmission
9
Jan 29, 2010 10:00 PM
markrd
2nd Generation S-series (1995-2005) Tech
4
May 8, 2009 01:39 PM
Marcin
2nd Generation S-series (1995-2005) Tech
10
Dec 23, 2006 12:11 AM
