Valvar 30A Relays // 1 364 986

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528i-1981
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Valvar 30A Relays // 1 364 986

Post by 528i-1981 » Sun Mar 15, 2020 5:34 pm

I've tried to armchair sleuth this out, but I'm finding the answer elusive. I have two relays sitting side-by-side on top of my battery. They are these:

Image

12V, 30A, Valvar type 230006, marked with part number 1 364 986. This is referenced on E28 boards as a "relief relay" for an auto tranny, but I have a manual. What are these for on E12s, exactly? Bonus points for the current BMW part number.

Thanks for the help.
(oo=00=oo) Eric
1981 528i Manual

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keehn
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Re: Valvar 30A Relays // 1 364 986

Post by keehn » Sun Mar 15, 2020 6:19 pm

Eric,

Also helping from my armchair :lol: . Did your E12 come from the factory with a manual? When I google your part number, it comes up as an automatic trans. relay as well. You may have to get out of your armchair and trace the wires to find out if there is another purpose for this relay.

"Eleanor" for example, doesn't have this relay (you mentioned it was above the battery), meaning that she came from the factory as a manual. I know this because I'm the third owner, and I also have the 4-speed the P.O removed when he installed the 5-speed. If your E12 was a manual from the factory like mine, then there would be no reason for BMW to add useless relays, especially to keep the bean counters happy.

Mike

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Re: Valvar 30A Relays // 1 364 986

Post by 528i-1981 » Mon Mar 16, 2020 6:40 am

I found them in the Haynes US-spec 528 schematics labelled as "Stage I" and "Stage II" relays. They control the A/C compressor and the aux fan via the various temp switches.
(oo=00=oo) Eric
1981 528i Manual

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Lock
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Re: Valvar 30A Relays // 1 364 986

Post by Lock » Sun Mar 22, 2020 1:26 pm

Eric, I can share some of the knowledge I have of my '79 electrical system.
The stage I and stage II relays (in my car, they're tacked onto the outside of the fuse box like an afterthought) are triggered from the 90C and 99C temp sensors in the radiator, and spin the front aux fan at 50% via its resistor and 100% speed respectively. The stage I relay is also linked to the AC compressor, so the aux fan comes on at half speed with the AC.
The auto trans/inhibitor relay is the Park-Neutral starter motor cutout, but this is located under the dash and intercepts the start signal from the ignition switch. I eliminated mine, factory manual cars don't come with this relay obviously so yours won't have it.
The relief relay - took me a while to figure this one out. It is triggered by the starter signal, and it cuts power to non-essential items in the fuse box so that all power can be directed to the starter and the coil during cranking.
Other cars do this via the ignition switch, e.g. the 'on' position for ECU, coils, fuel pump stays powered while 'ignition' line for the radio, power windows etc. cuts out when the key is turned to the 'start' position. BMWs have a relief relay that instead 'relieves' the electrical system of this non-essential load via the black and yellow star signal line in the fuse box. A poor translation for whatever the German word is I assume.
It's a strange name for that system and on forums can get mixed up with the inhibitor relay.
1979 528i 5-speed conversion G260/6, Motronic 1.3 179
1980 Honda CX-500

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