can this electric harness make a eberspacher conversion wiring kit from s2 to d4s heater

Question

can this electric harness make a eberspacher conversion wiring kit from s2 to d4s heater

This question is related to Eberspacher Airtronic Heater Upgrade Conversion Wiring Kit D2 to S2 D2L and D4S to M2 D4R.

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Answers (3)

Answered by Butler Technik's David Butler
Posted 2nd March, 2026 at 16:49 by David Butler

this harness is designed to upgrade the earlier Airtronic ( D4S, D2 etc) wiring harness - to allow installation of the later generation S2 or S3 Airtronic heaters. It is NOT suitable for downgrade of S2 D2L Airtronic to the earlier generation D4S Airtronic heaters. In this situation we would recommend replacing the S2 D2L heater to the larger output M3 D4R Airtronic heater

Posted 3rd March, 2026 at 07:28 by Anonymous

wat do l need to swap from Eberspacher s2 d2l to an M3 D4R , thanks

Posted 3rd March, 2026 at 13:50 by David Butler

The Eberspacher M3 D4R heater will fit in the same exact mounting, though it is physically larger so ensure you have enough space. Also the air ducting for an M3 D4R is larger @ 75mm internal diameter. If your existing ducting is standard S2 D2L 60mm internal diameter then you must use the larger suitable ducting

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