Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Air Conditioner Fan


Recommended Posts

So my A/C fan is only working intermittently. I search the forums and noticed a correlation between the ignition switch and the A/C fan. Coincidentally, my fan started having this problem "after" I replaced a faulty ignition switch. The symptons are that when I start the car, the lights come on the A/C unit, but will fluctuate between dim and bright. Also, the little snowflake icon does not appear. After driving for a while, the snow flake will appear and the fan will start working. It will keep working until I stop the car.

My durametric will throw the "31 Fresh air blower fault", but it doesn't seem like the actual fan is the problem. Has anybody had a similar problem? I would hate to replace the entire A/C unit, if that isn't the problem.

Ross

Link to comment
Share on other sites

  • Admin

Fault code 31 -- Motor of fresh-air blower

Voltage too low

Voltage too high

Voltage too low

Note: Voltage too low means that the measured blower voltage lies below the nominal blower voltage.

1. Check the heating activation relay.

Battery positive voltage must be present at terminal 87 when the ignition is switched on.

2. Unplug connector C from the heating/air-conditioning control.

3. Connect voltmeter to C 14 (positive) and ground.

Switch on ignition.

Display: Battery voltage

4. Push connector C on the heating/air-conditioning control.

5. Connect voltmeter to C 14 (positive) and C 11 (negative).

Maximum blower speed

Display: approx. 12 V

Minimum blower speed

Display: approx. a V

6. Connect voltmeter to C 14 (positive) and C 16 (negative).

Maximum blower speed

Display: approx. 5 V

Minimum blower speed

Display: approx. 9 V

7. Check driver.

Connect voltmeter to positive and pin 3 on driver connector.

Display: Battery voltage

Connect voltmeter to positive and pin 1 on driver connector.

Maximum blower speed

Display: approx. 5 V

Minimum blower speed

Display: approx. 9 V

Connect voltmeter to positive and pin 2 on the driver connector.

Maximum blower speed

Display: approx. 12 V

Minimum blower speed

Display: approx. 0V

8. Check wiring from heating/air-conditioning control to driver for continuity.

9. Check blower motor.

Voltage too high

Note: A higher blower voltage can only be caused by a short to ground on the wires to pins 1 or 2 of the driver.

1. Unplug connector C from the heating/air-conditioning control.

2. Unplug connector from the driver.

3. Connect ohmmeter to C 16 and ground.

Display: infinite ohms

4. Unplug connector from the fan motor.

5. Connect ohmmeter to driver connector pin 2 and ground.

Display: infinite ohms

Link to comment
Share on other sites

  • 1 year later...

Hi Loren,
I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes
1: Engine path left

what does it mean?

Edited by clipod
Link to comment
Share on other sites

  • Admin

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Can you post the actual fault code numbers and what diagnostic tool did you use?

Link to comment
Share on other sites

  • Moderators

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

Link to comment
Share on other sites

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Can you post the actual fault code numbers and what diagnostic tool did you use?

I am using Durametric to retrieve fault code.

"Heating and Air Conditioning: 31 Fresh Air Blower Fault"

It is what it gave me. Nothing more.

Link to comment
Share on other sites

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

I am not an expert in boxster repairs. I did few stuff like maf cleaning, headlamp replacement etc. Do you have any article which provides images on how to work on it. I searched online but couldn't find any. Also can you tell me whats the level of difficulty for this.

Link to comment
Share on other sites

  • Moderators

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

I am not an expert in boxster repairs. I did few stuff like maf cleaning, headlamp replacement etc. Do you have any article which provides images on how to work on it. I searched online but couldn't find any. Also can you tell me whats the level of difficulty for this.

I have no diagrams to offer as they are copyrighted materials, but the instructions are straightforward, requiring removal of the headlight assembly (you should have a tool in the car's tool kit for that), and a digital multimeter to test the circuits on the headlight.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.