Could out-of-spec thermostat cause DIC malfunction? - Saab 9-5 Bulletin Board - Saabnet.com
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Could out-of-spec thermostat cause DIC malfunction?
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Posted by Mr. Science [Email] (more from Mr. Science) on Sat, 7 May 2016 22:10:42 Share Post by Email
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Car is an '03 Aero wagon, 98k miles.

A month ago the T/S failed stuck open. I recognized the symptoms immediately from prior failure in April '13 at 84k. Temp gauge running low, then periodic drop to low w/ code P0016. Took it to a local Indy who confirmed the same and R&Red.

Here's where it gets weird. The service invoice listed p/n 8817538 (82deg Wahler T/S) vs. the spec 89deg Wahler (p/n 8817298) that was installed previously. Asked the shop about it and they said it was a typo - 89deg Wahler installed.

On long drives since I've noticed the gauge running low. Normal 9 o'clock around town, but on a long downgrade at highway speed it's maybe 8:30, and going down a steep mountain pass at 70mph it will nearly bottom out. But no fault codes until...

...last week I get a CEL & P1312. Disappeared after a few cycles. I figure it's DIC time, since my last one was 6yr/45k ago, and order one up from Eeuro. But after another highway trip this weekend with the funny temp gauge (which dropped out completely to low tonight - no code yet) I'm thinking...

1) Did they actually put in the 82 deg T/S?
2) Could that cause the P1312 and/or DIC issue?

I don't imagine there's a way to ID the T/S from the outside? Other recommendations?

Cheers,

Mr. Science
'03 9-5 Aero SW "Thor"
'01 9-3 SE "Svenska Haj" (R.I.P.)
'89 900S Sedan "Kajsa" (Retired)
'78 99L 2dr Sedan "Joergen" (R.I.P.)

posted by 73.14.4...

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