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Blend door actuator location?

Tiny
FROSTYVAN
  • MEMBER
  • 2002 CHEVROLET VENTURE
  • AUTOMATIC
My 2002 Chev Venture van has heat but very little defrost. The side windows frost up fast and the edges of the windshield start to frost up after about a 20min drive. What could the problem be?
Thursday, November 25th, 2010 AT 3:45 AM

7 Replies

Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
It sounds like the blend door actuator for the mode is not working. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car. Check out the diagrams (Below). Please let us know what happens.
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Thursday, November 25th, 2010 AT 5:08 AM
Tiny
FROSTYVAN
  • MEMBER
  • 2 POSTS
No I haven't done anything. Just discovered this issue as we just started getting very cold weather. Tring to find out if there is an easy fix or if I need to take it to a mechanic. Is the cabin filter easy to replace. Thank you so much for your input.
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Thursday, November 25th, 2010 AT 5:35 AM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
Removal (2001-2006) NOTE:Numbers in parenthesis refer to numbers in figures. Open the instrument panel compartment door. Remove the rear inside instrument panel compartment door. Open the HVAC module assembly access door (1). See Fig. 2. Fig. 2: Identifying HVAC Module Assembly Access Door (2001-2006) Courtesy of GENERAL MOTORS CORP. Pull out and remove the right hand compartment air filter. See Fig. 1. Slide the left hand passenger compartment air filter to the opening. Pull out and remove the remaining passenger compartment air filter.

Installation (2001-2006) Install the left hand passenger compartment air filter into the opening. Slide the left hand passenger compartment air filter over. See Fig. 1. Install the right hand passenger compartment air filter directly into the opening. Close the HVAC module assembly access door (1). See Fig. 2. Install the rear inside instrument panel compartment door. Close the instrument panel compartment door.
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Thursday, November 25th, 2010 AT 5:54 AM
Tiny
SUPERC69
  • MEMBER
  • 1 POST
Hello Dr. Loot, I have a '97 Venture with the same issue & I have replaced the cabin filters & still have the same issue. On my way home from work tonight I did hear a "thud", I assume the air door closed & then I had good heat & defrost. I would like to look at/replace the door accuator, where is it located? Thanks
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Saturday, December 4th, 2010 AT 9:17 AM
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
VACUUM ACTUATOR MODE VALVES
Removal & Installation (Front A/C Bi-Level Mode Valve)
Remove left side instrument panel sound insulator. Remove steering column instrument panel filler. Cut tie strap located on back side of mode valve vacuum actuator. Disconnect vacuum lines. Unsnap case joint and remove mode valve. See Fig. 6. To install, reverse removal procedure. Replace tie strap located on back side of mode valve vacuum actuator.
Removal & Installation (Front Defroster/Heater Mode Valve)
Remove glove box. Disconnect mode valve vacuum lines. Unsnap case joint and remove mode valve. See Fig. 6. To install, reverse removal procedure.
Removal & Installation (Rear Valve)
Remove left rear side quarter trim panel. Disconnect rear valve vacuum line. Remove rear valve vacuum actuator. Negative battery cable. To install, reverse removal procedure.
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Saturday, December 4th, 2010 AT 5:41 PM
Tiny
WHITEHURST_STEVEN
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET VENTURE
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 155,800 MILES
I got heat and A/C from my rear controls, but in the front I don't. It comes on once in a while, its inconsistent. Once in a blue moon the heat actually comes on in the front, but 95% of the time it blows Cold air.

I was wondering if you could tell me which actuator ( I have 3 below the dash and the other one is on the passenger side in front of the dash on the right hand side by the glass windshield ) controls the heat / cold flow to the front panels. I think its not working properly thus giving me cold air only in the front vents.

Thank You

Steven Whitehurst
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Monday, June 14th, 2021 AT 9:33 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Hey Steve,

We have a great guide on which actuator does what and a video to watch on how to change them,

https://www.2carpros.com/articles/replace-blend-door-motor

Please let me know if you need anything else to get the problem fixed.

Best, Ken
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Monday, June 14th, 2021 AT 9:33 AM (Merged)

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