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H20 pump o-ring and electric fan wiring ???s 700 1991

posted by  someone claiming to be Jon Belmont on  Sat Apr 14 14:50 CST 2001 [RELATED]

Well, today was "install new front speakers, water pump, and electric fan" day. I'm afraid I am batting about .333, which isn't bad for baseball, but pretty lousy for repairs. I got the water pump and thermostat replaced, but I'm afraid that the P.O.S. o-ring that came with the aftermarket water pump (as opposed to the beefy volvo o-ring) didn't seat properly on that hard line coming out of the back of the pump, and I've got a small leak. I'll pull the pump again tomorrow (ugh) to reseat or replace it.

QUESTION #1

Anybody know the proper dimensions for the o-ring so I can hunt down a replacement tomorrow? It's actually squared off, not round, but I guess that still qualifies as an o-ring, yes?

Anyways, on to the main subject of the post. I put in the electric fan in place of the visco-coupled stock puller fan, and now I've got to wire it up. I tried using the hot lead off the back of the alternator, but that kicked off a bunch of idiot lights unless I hooked up the fan AFTER the engine was already running. The post about the dual electric fan conversion on turbobricks.org suggested using a lead off of the ignition coil. Or, I can get a temperature sensor and rig up a relay or something right off of the battery. I'm not the sharpest blade in the knife drawer when it comes to vehicle wiring, so as long as the fan is on when it should be and doesn't require a manual switch or any work on the other side of the firewall, I'm happy.

QUESTION #2

Should I rig the fan up so that it's always on when the engine is running, or should I use a temperature sensor so that it's always on above a certain temperature?

2a- (If always on when engine running) What should I use for a 12V source and a ground? Also, do I need a relay?

2b- (If temperature triggered) Where do I get the sensor, what temperature should it trigger at, and HOW do I wire it?

Thanks for all the help in advance,

-Jon '91 Coupe 155K "Gustaf"





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