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)

Climate control does not control?


Recommended Posts

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

Link to comment
Share on other sites

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

The cabin temp sensor may be at fault.

Link to comment
Share on other sites

Actually, I took my '03 006 to the dealer about this last week. If I set the temp to 64F, the cabin still warms up well past that.

The service writer said that the system bases how much heat it adds on the temp of the incoming air, so it might well heat up beyond the temp set. If it seems warm, turn it off or open a window.

This didn't make sense to me. Why have a temp setting if the system essentially ignores it?

Link to comment
Share on other sites

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

The cabin temp sensor may be at fault.

Thanks KM....would you happen to know off hand where this sensor is located?

Dennis

Link to comment
Share on other sites

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

The cabin temp sensor may be at fault.

Thanks KM....would you happen to know off hand where this sensor is located?

Dennis

Dennis:

In a Boxster, The sensor for the cabin interior temperature is located inside (behind) the right dashboard vent. It is part of a small fan assembly that serves to blow interior air over the sensor.

It is probably in the same location in your C4.

Regards, Maurice.

Link to comment
Share on other sites

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

As discussed above, the sensor is on the right side of the dash. It is a thermocouple with a small fan to blow over it. It could be the thermocouple or the fan (or anything which prevents cabin air from blowing over the thermocouple.) Unfortunately, a thermocouple is something that does not fail very often... so, if that's not the problem, then you have to consider the control unit or the thermocouple located in the front of the car (the one that reports the outside temperature on your dashboard).

This brings me to the second point... the thermocouple located in the bumper is part of the climate control system, to the extent that it helps decide how much extra heat or cooling to add (based on the difference between the incoming fresh air and the desired temperature). So the service rep was kind of right - but not being clear. The end result is the climate control uses both sensors to maintain cabin temperature.

Loren might be able to shed more light as to how to diagnose the problem further.

Link to comment
Share on other sites

Have a 2k C4 Cab that recently has been acting up. When you set the climate contol to auto and set the temp at..say70 F it seems to heat the cabin well past this temp. I have never had a problem with this in the past and have thought it was one of the best climate control units out there.

Any suggestions?

Thanks

As discussed above, the sensor is on the right side of the dash. It is a thermocouple with a small fan to blow over it. It could be the thermocouple or the fan (or anything which prevents cabin air from blowing over the thermocouple.) Unfortunately, a thermocouple is something that does not fail very often... so, if that's not the problem, then you have to consider the control unit or the thermocouple located in the front of the car (the one that reports the outside temperature on your dashboard).

This brings me to the second point... the thermocouple located in the bumper is part of the climate control system, to the extent that it helps decide how much extra heat or cooling to add (based on the difference between the incoming fresh air and the desired temperature). So the service rep was kind of right - but not being clear. The end result is the climate control uses both sensors to maintain cabin temperature.

Loren might be able to shed more light as to how to diagnose the problem further.

Both, IAT & OAT are thermistors, resistors that change resistance with temperature...colder = higher resistance.

An open OAT (bumper sensor) would indicate EXTREME COLD outside and the system might compensate by increasing the cabin air OUTFLOW temperature beyond your comfort level, but not likely very much above your setpoint, on the average. An open OAT sensor on the other hand would result in the cabin temperature rising higher and higher.

Link to comment
Share on other sites

I'm not sure if your aircon panel will do this, but on early cars you could access the climate control diagnostics on the unit. I've attached some instructions I stole from an Audi forum (Audi manufacture the CC unit). If it works on your car, you should be able to see the temperature sensor outputs.

Climate_Diaagnostics.pdf

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • 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.