Unknown harness in engine bay

[tuononero]

Hi Guys,
i am changing the heads on my 2006 Grand Prix due to some cracks and while putting everything back together i found this harness laying around and i don't know where it goes.

The harness has a red label with 1281 on it. Anybody has an idea?

Thanks a lot and happy thanksgiving day.

[SubwayGuy]

I know there is a harness in the rear of the engine kind of by the alternator that goes to nothing. Is that where you got it from?

[Fivefingerdeathpunch]

Likely something for a car with cali emissions, for the air pump and stuff.

[Scottydoggs]

being the end of the white plug is real clean looking. it went somewhere.

[SubwayGuy]

being the end of the white plug is real clean looking. it went somewhere.

That could've been the end that was plugged in the harness, and the blue end was hanging out?

Maybe show a better picture of the blue end?

[tuononero]

I found it right between the radiator fan and the engine (where the AC lines sit).

[Turbocharged400sbc]

coolant temp sensor pigtail

from plug near injector 3/5 to the collant temp sensor below the T stat housing, harness runs bewteen alum dogbone bracket and T stat neck to keep it off exhaust.

pretty common for both ends to get unplugged during a teardown.

[Scottydoggs]

those plugs look pretty clean to me. when you find a stray plug in the bay its usually filthy dirty looking.

[Turbocharged400sbc]

that plstic tab halfway sticks to the top of the studed bolt holding on the T stat housing (bolt should be in the lower left hole nearest to dogbone bracket

[tuononero]

Ohhh thank you so much...... i wonder why they had such an adaptor harness like this. Maybe they changed the type of sensor during the years?

[Scottydoggs]

the harness on my car is much shorter looking. it goes from the temp sensor to a plug on the top of the lim. it routes under the d/s dog bone.

[tuononero]

Yeah, that was the one.
Thank you once again.

[Turbocharged400sbc]

Ohhh thank you so much...... i wonder why they had such an adaptor harness like this. Maybe they changed the type of sensor during the years?

yes, early cars had a 3 wire white connector and 3 wire ECT, then it went to a 2 wire ECT while keeping the 3 wire white connector, eventually replaced by the 2 wire white conn in 03ish+
and that pigtail is used in a different location on the F body's and other 60*v6 engine harness'.

[Travisgt2]

coolant temp sensor pigtail

from plug near injector 3/5 to the collant temp sensor below the T stat housing, harness runs bewteen alum dogbone bracket and T stat neck to keep it off exhaust.

pretty common for both ends to get unplugged during a teardown.

Dang beat me to it

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