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 Where to place the thermo switch for an electric f
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x96
V4 Fanatic

France
288 Posts

Posted - 10 Sep 2019 :  10:39:35 Show Profile Visit x96's Homepage Reply with Quote
thinking about to install an electric fan, I'm not sure where to place the thermo switch.

I started with the idea of install the metal T that switch the A/C on a 900. It is enough to change the switch for the correct one and plug the T in the top hose that goes to the radiator from the thermostat, it is simple and looks good. I think that the diameters are also correct.

On others cars the thermo switch are screwed in the top of the radiator, but if the thermostat fails the water would not flow enough to the radiator and maybe would not heat enough to activate the thermoswitch, would not be better to place it where the water is always hot?
Like in the hose that heats the automatic choke.

I'm not an expert and of course, if the engineeres put it in the radiator is for a good reason.

Hctor

Edited by - x96 on 10 Sep 2019 10:40:29

Derek
V4 Guru

United Kingdom
1873 Posts

Posted - 10 Sep 2019 :  13:45:38 Show Profile Reply with Quote
It's common to use that type of T adaptor with a thermal switch. If the 900 one fits your hose then fine but they are available in various bore sizes. The threaded boss also available in several sizes to fit the switch of your choice. I prefer an adjustable thermal switch so that you can change the temp setting to suit your car and the ambient temps if needed. An override switch is also useful.
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stevebod
V4 Fanatic

United Kingdom
336 Posts

Posted - 11 Sep 2019 :  11:22:35 Show Profile Visit stevebod's Homepage Reply with Quote
In case it helps - the last time I fitted a Kenlow fan on a friends car it came with a sensor that just pushed into the radiator fins at the top of the radiator. This negated the need for plumbing alterations.
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melle
V4 Guru

United Kingdom
2835 Posts

Posted - 11 Sep 2019 :  21:19:44 Show Profile Visit melle's Homepage Reply with Quote
In my 96 I used a 900 T-piece in the top hose (32mm) with a Febi 06031 sender (M22x1.5). I also fitted an override switch, but I've never used it. I've wired it so the pilot light comes on when the fan is on, no matter how it's switched on (thermo or override switch).



www.saabv4.com
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x96
V4 Fanatic

France
288 Posts

Posted - 12 Sep 2019 :  14:11:00 Show Profile Visit x96's Homepage Reply with Quote
Thanks for your answers.
I see the instalation has always the sensor after the thermostat.
I've got a T from a 900 so, I'll buy that febi sensor to fit like on the 900. It is a clean solution and also allows to fit any kind of fan.
Maybe I start with the simpliest solution and add the permanent and adjustable switch afterwards if needed.

I don't have experience with the movement of the temp gauge. Where is the normal position?
In the middle like on the 900?
that corresponds with 90C degrees? (This gauge is the vertical type from a '79 year model.)

Is it dangerous if it goes up a bit?

Hctor
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Borstlap
V4 Fanatic

Norway
279 Posts

Posted - 13 Sep 2019 :  19:14:59 Show Profile Reply with Quote
The half way horizontal position is for normal, the 900 inherited that from its predecessors. It is not dangerous if the needle gets a bit higher, just as long as it doesn't come into the red section. But if the needle gets above normal under normal driving conditions constantly it is time to check things. First of all the electrics. A bad connection may cause a higher reading. I have that occasionally in the Sonett. The needle gets a tad beyond normal but when I tap once or twice on the glass of the gauge it returns to the normal position.

Alex

Edited by - Borstlap on 13 Sep 2019 19:16:33
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andydeans3
V4 Guru

United Kingdom
1194 Posts

Posted - 16 Sep 2019 :  22:28:28 Show Profile Reply with Quote
My Kenlowe came with a special wide rubber band, with a slot in it. This band was fitted to the top pipe of the radiator. The top hose was then fitted over this. It works very well.

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
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