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Date: Wed, 10 May 2000 10:32:08 +0200
From: Robert Brown <rjbnopsamnetNOSPAM.se>
Subject: Re: overheating fun


Hi Mauricio, Maybe I'm a bit late into this thread (and I can't see the previous postings) but have you checked the thermostatic switch (the electric one on the left side of the radiator), as well as the fan? Short across the thermostat contacts and see if you get the fan to come on. If it does, you may have a bad switch. Easy to replace if you drain some coolant first. If it doesn't, get stuck into the fan motor and fix it. There's another thread current on this NG that's discussing a similar problem. Check there as well. The fan should come on once the temperature needle rises about 15 degrees (of angle) from the horizontal. If you're close to the red before anything happens, then you're way too late. As far as the broken bolt is concerned, that should be generic enough so you an find a replacement at a hardware store (8mm with 13mm head, if I remember correctly), so don't worry about that. Also, check the radiator to make sure that the "zigzag stuff" that dissipates the heat is still there and is still good metal. If it corrodes, it loses its heat transfer properties and you may as well not have a radiator at all. But I think that the fan you mention is your first priority. Good luck. Robert Gothenburg (1983 900 GL, 1999 9-3 200) TimeRangernopsam.com wrote: > On Tue, 09 May 2000 19:52:19 GMT, ucenopsamgov (Mauricio Tavares) > wrote: > > > More interesting news from my friend who owns the 85 900S. He > >started saying that the temperature was going up close to red (but > >still inthe green) whenever he drove the car. No coolant leaks. One > >of the fans was on all the time but the other never came on. > > If the car is equipped with A/C, that is what the other fan is for. > > > > >One day he went to take the thermostat housing so we could check the > >thermostat for problems. Well, he managed to break one of the bolts > >and we do not know what to do about that. Now, back to the > >thermostat, it is not there. It seems the previous owner did not like > >it and took it off. > > The purpose of the thermostat is to keep the engine warm, not cool. > > > > >He drove the car back to his house as it was (we tried to hold the > >housing with just one bolt and a vise-grip). On the next day he > >reported that on the way back he got in the red zone for about a > >minute or so, as he was getting in his place. > > > > Questions: > > > > o Did he warped the head? How to figure out? > > Only try to "figure it out" if a leak develops. The head may have > warped but will/may hold its shape as long as it is bolted down. In > other words - if it aint broke dont try to fix it. > > > o How to figure out why he was havign overheating problems to > >begin with? Water pump failure? How to check and replace the pump? > >From what I saw, it does not look fun. > > The first thing that I would check is the actual coolant temperature > using a thermometer - a candy thermometer should do fine. The car may > be the victim of a faulty sensor/sending unit/guage. Check to see if > the coolant is flowing through the radiator. Turn the heater on, does > it provide a steady flow of hot air? NOTE: If a car is overheating, > turning the heater on can reduce the engine temp by as much as 15 > degrees F. That heater coil is nothing more than a mini radiator. > -- > A question is better debated and left unanswered than a question that is answered without debate. > -Unknown

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