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I find that the tacks are not usually bad. The Problem is the fly wheel sensor atached to the transmission houseing.This picks up rotation RPM's of the fly wheel ,sending the information to a control unit that controls the tack. The pick up unit can get dirty with oil and dirt or metal particles from stater gear, or the fly wheel [ring gear] can becomedirty enough that the pick up magnet does not make a signal. Also check the wireing for this unit to make sure ,no breaks or bare spots that can contack metal. Before doing all those things check your fuzes. Those old type fuzes may be alright but get cruddy over time and need moving around some to make contack. Sure hope Iwas able to help.

The A/C relay, A.K.A. the KLIMA relay, is located behind the battery next to the firewall. It is a little black box that plugs in next to the OVP relay.

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Q: 1990 Mercedes 300e where is the ac relay located?
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