What does relay 135 do?

Hey gang,

Well I have my whole – torn apart doing the phone replacement for the heating system. Dangling down with no apparent home is a relay number 135… Does anybody know what that does?

I haven't figured out how to find out what specific numbered relays do via the Bentley book… Am I missing something?

Thanks,

Steve

Behind the center console? If so, it turns the AC off, from a standing start. I remove it and add a jumper wire between terminals 30 and 87.

-Todd

I guess it’s a load reduction relay. Temporarily turns off AC while you’re trying to run your glow plugs and start the car. This way, the car can start comfortably. Bypassing the relay lets the AC run WHILE the glow plugs run, puts a much greater strain on your battery and could result in the car NOT starting. Best leave relay 135 installed, eh?

That’s not what it does. Like most accessories, AC is already on a load reduction relay.

To clarify, it interrupts power to the clutch coil, to reduce drag on the engine at low engine rpm take offs. I don’t notice a huge difference other than the vents blowing hot air, hence the reason I bypass it, in my cars. I found it unnecessary and annoying.

I should add 135 delete to my signature mods...

-Todd

Thanks guys... Is there anywhere in the Bentley ( or here) that tells you what each numbered relay does?

Regards,
Steve

http://forums.tdiclub.com/showthread.php?t=204372 for some descriptions of relay numbers and http://www.a2resource.com/electrical/CE2.html for more descriptions, (scroll to bottom).

A2resourse is an excellent source of information, even for B3/4/Mk3 owners since all those cars (save for early Mk2) all use the CE2 electrics system.

since relays often have multiple purposes I sometimes just query the part number of the relay (if available) to see what functions it is supposed to cover.

Additionally, there are sometimes different relays (different numbers) that do the same thing, like the 99 and 196 relays, which both provide variable delay wiper functionality.

Steve