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Old 06-24-2007, 10:39 PM   #1
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Default A/C Blows cold out of Passenger side and warm out of driver

I have a 2000 Bonneville and when I switch to A/C mode the passenger side vents blow ice cold and the driver'* side vents blow cool. The air coming ut of the driver'* side smells moldy also. I have checked the air mix door lotors and they move freely when I switch temps in the car. Any suggestions and what it could be?
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Old 06-24-2007, 10:45 PM   #2
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If you do a search you'll see that it'* been discussed a few times. If your actuators are good then, check your freon level. If it'* low, it will give that symptom.
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Old 06-25-2007, 11:04 AM   #3
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Moldy Air - check and replace cabin air filter if necessary. It is located under the hood up near the passenger side windshield wiper.

As for your air conditioning issue, I had the same problem. I took the dash all apart to only figure out that I needed more refrigerant. Before you spend lots of hours and wasting time doing what I did, try adding more refrigerant to the system. It'* cheaper and will save you a lot of time.

BTW it also helps to have a refrigerant hose with a gage on it that tells you how much more refrigerant you need.
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Old 06-26-2007, 02:32 PM   #4
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trust me keep adding refridgerant it will change
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Old 07-08-2007, 10:59 PM   #5
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While I personally haven't experienced a musty smell, here are some things to check (since I was dealing with HVAC myself today):

Evaporator drain tube for blockage
Plenum to windshield seal leakage
HVAC filter cover for debris
Wet carpet or mats & HVAC case seals at front of dash

We're talking about a musty smell, and not coolant, burning candle, or oil smell.
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Old 07-08-2007, 11:12 PM   #6
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FWIW - GM has a technical service bulletin on the musty odor.

Quote:
A/C - Odor Emission in Hot Weather

File In Section: 01 - HVAC

Bulletin No.: 99-01-39-004A

Date: May, 2001

TECHNICAL
Subject:
Air Conditioning Odor (Install Kit)

Models:
1993-2002 Passenger Cars
1993-2002 Light & Medium Duty Trucks

This bulletin is being revised to update the model years, service procedure, parts information and to add the GEO and Medium Duty models. Please discard Corporate Bulletin Number 99-01-39-004 (Section 01 - HVAC).

Condition

Some customers may comment on odors emitted from the air conditioning system, primarily at start-up in hot humid climates.

Cause

This odor may be the result of microbial growth on the evaporator core. When the blower motor fan is turned on, the microbial growth may release an unpleasant, musty odor into the passenger compartment. There are several other possible sources of a musty odor in a vehicle. A common source is a water leak. Follow the Service Manual procedure for identifying and correcting water leaks if other odor sources are found. The procedure contained in this bulletin is only applicable if the source of the odor has already been determined to be the HVAC module.

Correction

To remove odors of this type, it is necessary to eliminate the microbial growth and prevent its reoccurrence. To accomplish this, the following steps must be completed:
1. Apply evaporator core Cooling Coil Coating
(Aerosol 6 oz), P/N 12377951 (AC Delco(R) 15-102)
(in Canada, use P/N 10953503) or Cooling Coil
Coating Kit with Extension Nozzle, P/N 12346391
(AC Delco(R) 10-120).

Refills are available for the Cooling Coil Coating
Kit with Extension Nozzle, P/N 12346391
(AC Delco(R) 10-120). Refer to the chart below.

2. Install the Electronic Evaporator Dryer, P/N 12497910 (AC Delco(R) 15-5876).

Important : The Cooling Coil Coatings listed above are the only GM approved products for the disinfection and long-term control of evaporator microbial growth. The Cooling Coil Coating will disinfect the evaporator core and help inhibit the growth of future mold and mildew.

The Electronic Evaporator Dryer will activate when the ambient temperature near the module is above 16C (60F) when the vehicle is started up. Approximately 30 minutes after the vehicle has been turned off, the blower will activate for 10 seconds every 10 minutes for 2 hours unless the vehicle is restarted. If a restart occurs, the Electronic Evaporator Dryer module will reset automatically. This on/off blower activation will dry the evaporator core and case reducing the chance of reoccurring A/C odor. The Electronic Evaporator Dryer is self fused and has a battery rundown protection feature that inactivates the dryer if voltage drops below 12.5 volts.

Service Procedure
1. Visually inspect the air conditioning evaporator drain hose for obstructions and/or working condition.

2. The cooling coil coating fluid must be applied to a dry evaporator core. Apply coil coating fluid as described in the instructions supplied with the kit. In some instances, the blower motor resistor can be removed for this spraying operation. If used, the opening can be taped over and the nozzle inserted through a hole in the tape. The kit instructions identify a drilling procedure to apply the coating fluid. When using this type of procedure, care must be taken to avoid evaporator damage and any holes must be properly sealed. Some coating fluid may overflow from the drain hose.

Important : When installing the Electric Evaporator Module, you MUST use the included electrical splice connectors to ensure a splice.

3. Complete detailed installation instructions and wire connectors are supplied with the Electronic Evaporator Dryer. The ground wire should be attached to a body ground source. If any other wire splicing procedures are needed, follow the wire repair procedures in the Electrical sub-section of Body & Accessories in the appropriate Service Manual. If required, the evaporator dryer can be installed underhood away from extreme heat conditions (i.e. exhaust manifolds) and/or water splash areas. In all cases, the evaporator dryer module must be secured with a Velcro(R) strip (not included in the kit), or you may use the integral hooks to utilize tie straps. Using a Velcro(R) strip is preferred as the use of the integral hooks may cause rattles.

4. When the installation procedure is complete and power is supplied, the module will self-test. Thirty seconds after power is supplied, the high blower speed will be activated 3 times (for 2 seconds per cycle). When the test has run, install the Electronic Evaporator Dryer label on the blower motor case in a visible area.
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Old 07-08-2007, 11:23 PM   #7
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Quote:
Originally Posted by bigdawg56
trust me keep adding refridgerant it will change
^^^Do not take this advice you could easily over charge....


If your blend doors are working properly you next need to check your pressures as
you may be under charged, being under charged will cause this symptom like mentioned
above, what'* happening is because your under charged(if that'* the case) your
evaporator is only getting cold half way up not and not the whole way so half the
vents will be cold and the other will be warm(er).
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Old 07-10-2007, 11:20 AM   #8
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it is a factory default with low coolant that the passenger side be cool while the driver side is warm. Im not saying to over fill ,use a gauge but 99 times out of a 100 you have low refridgerant!
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Old 07-01-2008, 11:53 PM   #9
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I had the same problem with mine so I added refrigerant and the pas. side got ice cold and the driver did not help much. I only added one small can though, not sure how much to add. I have noticed now that both sides are warm. Maybe a leak? I'm not sure.
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Old 07-02-2008, 11:05 PM   #10
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it'* possible your cabin filter is clogged... read the whole thread for possible other problems as well...
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