HVAC problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Timco · 07-23-2016, 05:55 AM

The snowflake part is correct. Even in auto, it won't add any AC unless the snowflake is displayed.

911monty · 07-23-2016, 10:28 AM

Just to be clear and I don't think year makes any difference, but with everything off, when I press the AUTO button 3 things happen on the display. AUTO displays on the top left. the temp set point shows and the snowflake appears to the lower left. The blower also comes on. I do not have to press the snowflake to turn on the AC and the AC does not cycle on and off when set point is attained. Mine is a 98. Yours should be similar.

Roger1965 · 07-23-2016, 10:46 AM

Snowflake never comes on unless I press snowflake button. If I hit auto, fan comes on at full speed setting, no heat or ac regardless of temp set or exterior temperature.

Heat comes on only when I put temp at high setting. And then it is so hot in the car after a couple of minutes I click it down to 85, and heat turns off.

If I set temp at 68 and hit auto, I get full speed fan with no ac or heat, doesn't matter if it's 35 or 85 outside.

AC comes on only when I hit snowflake button.

Nothing cycles automatically. I have to make any changes manually by pushing buttons.

Fan speed buttons work fine. It could be the temp sensor in the dash. I replaced it but didn't bench test the old or "new" one.

911monty · 07-23-2016, 11:20 AM

Do you have a Durametric available? I think you need one to help. I don't think your AUTO is functioning correctly. Could be the temp probe as you say or the controller. A durametric should give you any fault codes and the ability to check what the temp probe is currently sending as well as cycle some of the functions.

Roger1965 · 07-23-2016, 12:01 PM

Yeah, definately plan to get a durametric. I've been wanting one to monitor my cam deviation.

But first I need to get a laptop! LOL

I've been living on my ipad so long my laptop is outdated.

911monty · 07-23-2016, 12:18 PM

The Durametric website has the minimum requirements to run the software. I know win7 is still ok. i use an old Dell as my garage computer. I'd say you need to scan for codes before replacing parts. Although there was/is a controller in the FS section.