Wiring nightmare Air cond..

[ivan segal]

Hi:
I cannot rewire my air condition on my 280i..my shop manual does not relate to my wiring..did the factory keep changing wiring?

can anyone send me wiring for a 1985 280i coupe (USA) model

Thanks,

Ivan

[jeff m]

I'm not sure about TVR..but the prev owner may have!!!
Diag

You are aware that the low pressure switch will prevent operation of the AC clutch and fan until you get about half a pound in there.

[jeff m]

Before you start rewiring, I would pull the AC relay and wrap a wire on the 86 tag, plug the relay back in. Turn the heat control til you hear the micro switch operate, then tap the wire onto a good ground. That should op the fan and clutch. (and prove your electrics)

ETA ignition on and blower fan running.

[Wedg1e]

jeff m said:

Before you start rewiring, I would pull the AC relay and wrap a wire on the 86 tag, plug the relay back in. Turn the heat control til you hear the micro switch operate, then tap the wire onto a good ground. That should op the fan and clutch. (and prove your electrics)

ETA ignition on and blower fan running.

I'd be VERY careful about doing this; I've seen more than one occurrence where the 85 and 86 have been swapped! So much for convention...

[ivan segal]

Hi:
I must be loosing my mind...I cannot find the yellow black wire either into or out of the air cond. pump...I only find the black ground lead is it way under the pump?

Please advise..

Ivan

[jeff m]

Wedg1e said:

jeff m said:

Before you start rewiring, I would pull the AC relay and wrap a wire on the 86 tag, plug the relay back in. Turn the heat control til you hear the micro switch operate, then tap the wire onto a good ground. That should op the fan and clutch. (and prove your electrics)

ETA ignition on and blower fan running.

I'd be VERY careful about doing this; I've seen more than one occurrence where the 85 and 86 have been swapped! So much for convention...

On a TVR..never .... possibly stick a testlamp in 85 & 86 then put the wire on the one without 12v on it.

[jeff m]

ivan segal said:

Hi:
I must be loosing my mind...I cannot find the yellow black wire either into or out of the air cond. pump...I only find the black ground lead is it way under the pump?

Please advise..

Ivan

The AC pump doesn't have a ground wire. (on almost any car) That black is your black/yellow. It is black because it is a part of the pump not a bit of the TVR wiring loom. It should go to the blue multi connector. If in doubt tap it out to the AC condenser fan live. You should find it is common and ultimately goes to a contact on the AC relay.

Edited by jeff m on Wednesday 13th April 21:27

[ivan segal]

Attn: Jeffm:

Hey you are right and when I run a plus lead to the black the clutch engages...

Thanks,

Ivan