Mechanics

HAVE HEAT BUT NO DEFROST

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?
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Frostyvan
November 25, 2010.



Have you replace the cabin filter?


Dr Loot
Nov 25, 2010.
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.


Tiny
Frostyvan
Nov 25, 2010.
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.


Dr Loot
Nov 25, 2010.
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


Tiny
Superc69
Dec 4, 2010.
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.


Dr Loot
Dec 4, 2010.