Heat Exchanger

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Nov 21, 2025 | 03:15 PM

Kingdog44

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Heat Exchanger

On my 2012 GS M6 that heat small exchanger in front of the AC condenser is it a rear end cooler or a transmission cooler

Nov 21, 2025 | 06:36 PM

FatsWaller

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If it’s on the driver’s side it’s the engine oil cooler.

Nov 22, 2025 | 08:56 AM

dr_gallup

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Yes, engine oil.

Nov 22, 2025 | 12:26 PM

FatsWaller

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From: Etobicoke (Toronto) Ontario

Just FYI, the extra cooling that you have in your GS manual coupe includes

A heat exchanger for the manual trans, same as the auto trans would use, in the passenger side radiator end tank.
Differential heat exchanger - mounted on rear diff. The diff is equipped with a pump to flow diff fluid through the cooler. Air cooled.
Engine Oil cooler - air cooled mounted in front of AC condenser, driver side.

There's also a small power steering fluid cooler sitting behind the rad I believe, but I think all models would have this.

Nov 22, 2025 | 01:54 PM

Kingdog44

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Ok FatsWaller thanks for the info, I tried to follow the lines to see where they went but with all the duct work they just disappeared
Probably is an engine oil cooler but its positioned center of the AC condenser

Nov 22, 2025 | 04:13 PM

FatsWaller

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The EOC is mounted behind a baffle which covers a large part of the AC condenser. Not a great pic but you can see the 2 solid aluminum lines of about 1/2” od entering the baffle to hook up with EOC.

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