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The engine cooling fan relay is on top of the radiator on the passenger side just under the plastic. It will slide out if you pull it towards the rear of the car. The relay has three connectors attached to it. With the relay in place if you kind of bend over and look at it, the "A" connector is passenger side, the "B" connector is in the middle, and the "C" connector is drivers side or inboard. The "A" connector (single red wire) is direct power from the battery or alternator. You should have 12V there all the time. There is a fusible link in the wire so if you have no power, back up to the connector on the alternator and if you have power there then the fusible link is blown. The "B" connector is a yellow wire and a yellow-white wire, these are grounds from the Engine computer to the control circuit in the relay. The yellow-White is half fan speed, and the yellow wire is fan full speed. The "C" connector is power out of the relay, the green wire is fan low speed, and the red is fan high speed.
With the A/C on you should have ground at the yellow-white wire on connector "B". Give it a ground and see if it starts, if it does then the computer isn't grounding like it should. Try grounding the "B" connector yellow wire and see if the fan runs in high speed.
This should help figure out whats up.
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Rich K. http://www.volvospeed.com/bay13.htm bay13@cox.net
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