Date: Wed, 03 Apr 2002 22:49:10 +0100 From: danny <dannynopsamia-esprezzo.com> Subject: Re: 2 problems. Could be linked ?
Jim wrote: > Hi folks, > > I have a 1994 ? (UK L) 9000 CSE 2.3 non turbo. > > The car is fitted with the ACC climate control system. Since I bought > the vehicle (used), the air-conditioning has not worked. This I put down > to the fact that the system was probably empty of Freon gas, since I > hadn't laid out the money to have it flushed and refilled. It supplied > warm/hot air, and in the UK, that's what you need far more often than > aircon. I put it off. > > Once or twice, the ventilator fan motor failed. Once for a day, and once > for several weeks. Just recently, it failed and didn't come back. That > is to say, the ACC unit (on Auto or Econ setting) shows the fan speed > LED in the centre position, and the fan is not engaged. If you try to > select a higher speed, the LED jumps to the minimum position and stays > there. The rear window fan is working, along with the heated rear window > and (apparently) the vent selectors. After checking the obvious fuses, I > put this down to a faulty blower motor, and filed it in the "sort it out > when I get some time" department. I have run the auto diagnostic > (calibration) test on the ACC, and it finds 1 fault. But then I think it > always did, even when the fan was working. > > Just last week, on a long run, the engine decided to overheat. The > radiators are intact, and the water level is normal. Basically, the > cooling fan is not engaging when it should. > > I have checked all the fuses and relays, and when reading my Hayes > guide, was surprised to learn that in addition to the normal > thermostatic switch, relay and fuse in the cooling fan circuit, there > also seems to be some relationship between the fan and the ACC unit. (I > guess because the AC unit uses the cooling fan as an air intake to the > compressor). As yet, I havent tested the thermostatic switch, since the > coincidence of 2 problems with the same common denominator is leading me > to think that maybe my ACC controller is just going from bad to worse > and taking systems down as it goes. > > Has anyone had a similar experience ? Would anyone have any advice on > how to go about sorting out this jolly little problem ? > > I'd be very grateful. Comment: The information below may well be moot since I don't have ACC and therefore can't prove whether it can possibly affect the engine fan. Whilst I have a 9000, it is an earlier model than yours, without ACC. I still think that your problems are not linked. The cooling fan should come on when the engine needs it - that is when the temperature sender in the radiator switches. When A/C is running the system will also operate the fan, but regardless of whether the A/C is functioning (or the ACC) the fan should still operate according to engine temperature. There are several reasons why the fan may not operate. Usual culprit is the temperature switch or the wiring between that and the fan. To test, unplug the wires (you may have 2 or 3 depending on the switch type) - connect the two and the fan should start, if a 3 wire plug, check the manual for the live feed, and connect with either of the remaining two wires, and the fan should run. If this test fails then remove the relay from the n/s wheel arch box and bridge the centre top and bottom holes with a wire. The fan should start. This applies to my 19990 9000 and may be different for yours, but if there is a fan relay there the wiring should be the same. If the wiring is the same and the fan doesn't start, there is a fault with the fan or the connection to it. If the fan starts the problem is either the wiring and/or the temperature switch mounted in the radiator, or you have a serious head gasket/overheating problem whereby the radiator has air/gas in it, preventing the temperature switch from operating (since water under pressure will reach a higher temperature than air). If your are not using water, then I would carry out the checks above. -- Regards, Danny http://www.gaggia-espresso.com (a purely hobby site) http://www.dannyscoffee.com (UK advert for my mobile espresso service) swap Z for above characters in email address to reply
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