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Posted (edited)

I need to establish an acceptable baseline as I continue to figure out my lack of heat concern:

New thermostat

My Duremetric software states all air max flaps (including temp mix) are in working order. I pulled the foot bulkhead to visually check the temp mix motor and arm. They are in fact able to move the full range from "lock to lock".

System properly bleed out

Yet I still don't have heat while under way (ECTS 90C) but I can get acceptable heat if I keep the car stationary and keep the revs up (2500) I get ECTS temps of 99-102C.

What I'm looking for is someone to give me a baseline temp of their OUTLET TEMP under the following conditions.

run car up to temp and let idle for 5 minutes

set temp on AC to HI with FAN to HI

Turn off AC (*)

Take PST2/Durametric readings of

  • ECTS Temp
  • OUTLET Temp

and PM or email with your results (carboncow@gmail.com)

I get ECTS 90-91C and OUTLET TEMP of 47C. I need to know if you outlet temp is higher at the given ECTS temp.

UPDATED: This was resolved and it's an interested one a full write with photos will soon follow but here is the short of it:

Removed heater core to test for blockage, air or foam covering it. We'l foam was involved but the opposite. You know all that foam you get out your vent sometimes? It doesn't come from the filter is comes from the air mix flap doors. They are actually full of holes and covered in foam. If all the foam has dry rotted and blown away the doors are swiss cheese and allow cool air to bleed into the heat during the winter and the opposite in the summer! Never great heat or AC at highway speeds. So I cut open the top of the AC system with a dremel to remove the flap, recover it with foam covered in electrical tape and all is well. Heat is incredible.

I took some bad photos with my camera phone but those who are curious or need to know will get the drift. In all my searching and travels NOBODY has ever mentioned this missing foam or door flaps, can I really be the first? I believe this may have been troubleshot by a tech before as I had subtle signs of entry. My guess is a tech may have figured out the issue but since their solution is a $1000+ air box assembly (you cannot just buy the flap anyways) and $1000 in labor to remove the dash, evaporator and airbox...my way rocks. 3 hours, $3.00 in foam and roll of electrical tape!

Lastly when I was told the foam was coming from the air filter area I was somewhat skeptical becuase the foam has to travel through the evaporator and/or heater core to come out the vent...and the chunks were just to be big to get past those two items. Therefor I'm sure the condensor still does have foam slightly blocking it as some foam is missing from the air filter, but I removed the rest to play it safe.

Believe me if you have foam coming out of your vents you have the air mix (temp value) flap foam falling apart and eventually your heating capacity will deminish. As the early 986 and 996 start to get older we'll be seeing this...and remember my write up...becuase I was the first!

Edited by rsfeller

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