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Discussion Starter · #1 ·
Hi again guys,

my 91 2.3 carlsson runs very very hot, i have bypassed the switch so the fan runs constantly when the engine is running, is this a good idea or not? or is there any kind of up graded fan i could install? any help/advice would be much appreciated.
Thanks Lee
 

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Hi! Welcome to Saabscene

Running the fan all the time should be OK for the fan as I think cars with aircon will do this anyway when the aircon is on.

However you shouldn't have to do this to keep the engine cool. What evidence do you have that it's running hot? Just the temperature gauge? Boiling? Overflowing?

Give us a bit more info and we'll try and help.
 

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Discussion Starter · #3 ·
Thanks, here is alittle more info. I bought her on the hottest day of the year(coincidence i'm sure) on the way home i got stuck in traffic and the temp guage started climbing up and up! i was waiting for the fan to kick in but it did not and steam started to come from the bonnet, i stopped immediately!! Now there is a electical connection on the left hand side bottem of the radiator which was very rusty indeed, so the nice AA man put a manual switch there which now turns the fan on/off, so since then i have just switched on the fan when i'm driving, when running the fan constantly the temp guage is around 8 o'clock under normal driving conditions,(climbs to around 10 o'clock when driving harder) which is alot less worrying.
 

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Hi and welcome to saabscene.

It sounds like the thermostatic switch could be faulty. I've never had a problem with this but I think the switch is located on LHS at bottom of radiator (I'll check later).
If by passing it by using a manual switch is making it run at about 8 o clock then this is about right. It could be corroded connections or the switch is faulty, either way it is a cheap fix.

HTH
Ant
 

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Definitely sounds like the thermo switch is not operating. As you mentioned corroded connectors, it sounds like th problem is there. There should be enough slack to cut off the connectors and strip back the wires until you find uncorroded wire. Then re-make the connection using proprietary crimps or even soldering. DO not use IDC (Scotchlock) type connectors.

You will probably also benefit from using a cooling system flush to clear out any sludge etc. Refill with fresh antifreeze etc. and you should be OK.
 

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Discussion Starter · #6 ·
Thanks very much,

i'll replace the thermo switch soon, i think i'll wire the electric cooling fan to a switch inside the car, just for those hotter and go faster days! does anybody reccommend a perfomance fan or is the standerd one sufficiant enough?
 

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the themo switch in the radiator of my 9000 has died.. the funny thing is that it dies to a short circuit, so the fan would run al lthe time. i fixed this by installing a switch inside the cabin of my car so i can manually turn the fan on/off when wanted.... keeps the temps lower now.. all i need to do now is replace the thermostat (mines a lil sticky atm) and all will be good in the cooling department.
 

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I had this problem on my CS Carlsson and the switch wouldn't turn the fan on. After much swearing we discovered from a Saab specialist that the most common cause of fan problems is the wiring loom round the front of the car. Over the summer I decided to investigate other problems I was having with the wiring loom below the radiator. In short several of the wires in the loom were corroded and had turned to dust. One of them was the light blue wire from the fan switch on the rad to the relay/fuse box by the battery. Stripping the loom out and replacing the wire was my final task and all is okay. I wouldn't suggest stripping your loom out but you could try wiring the blue (not blue/white) wire from the fan switch on the rad straight to the fan relay in the box. Try this before you buy a new thermoswitch.
 
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