Electric fans
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Senior Member
Joined: Aug 2016
Posts: 175
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From: Toronto
Electric fans
Ok I know I have chatted about This before but it's still driving me nuts. So my 79 has the twin electric fans I assume because the car has air conditioning. I don't want any overheat problems this next summer so I want these bloody things to come on sooner. They only seem to come on if the car is already on It's way to overheating. I can't figure out if you can change the thermostat to a different temp because I am not even sure which thermostat sends the temp to these fans. I really don't want to magiver up a switch but is that the easier way to go? The car is completely original so I would rather not.
Veteran Member
Joined: Mar 2008
Posts: 25,529
Likes: 11,722
From: Pacific Northwest USA
Series II or Series III ?
On the Series III, at least, the fan switch is in the RH radiator tank. I can't remember the details but it is not Jaguar-specific and whoever made the switch made it at different temp ratings for different car manufacturers.
Someone here might remember the details....or an archive search might reveal some good info. I'm 90% sure that somebody identified a lower temp version of the same switch
If you have a Series II....well...I'm not sure if they used the same switch
Cheers
DD
On the Series III, at least, the fan switch is in the RH radiator tank. I can't remember the details but it is not Jaguar-specific and whoever made the switch made it at different temp ratings for different car manufacturers.
Someone here might remember the details....or an archive search might reveal some good info. I'm 90% sure that somebody identified a lower temp version of the same switch
If you have a Series II....well...I'm not sure if they used the same switch
Cheers
DD
Joined: Feb 2010
Posts: 28,811
Likes: 11,280
From: Adelaide Stralia
OK.
Might pay to add that to your Sig, and the fact its a 6 cylinder as well, which will save a lot of time and guess work..
The S2 down here had a metal fan, and the S3 had a plastic.
The plastic is better at drawing more air at the same given fan speed.
All my S2 6cylinders had the metal fans, and NO electric. I never had hot running issues on any of them, even in our 45c+ Summers.
BUT
The radiators were recored.
The fan hubs were NEW.
The pressure cap was new, and blew off within spec, which was a task in itself.
82c thermostat of the correct length.
If these fans worry you so much, I would simply use a relay and have them switch ON whenever the A/C is on. Very simple to do, and would probably help the A/C run colder, due to more air at low speed???, but I doubt you get our summer temps, so if its running hot, maybe there are other issues.
The V12's were the same, except they all had Efans fitted by me, and NO engine driven fan at all.
Might pay to add that to your Sig, and the fact its a 6 cylinder as well, which will save a lot of time and guess work..
The S2 down here had a metal fan, and the S3 had a plastic.
The plastic is better at drawing more air at the same given fan speed.
All my S2 6cylinders had the metal fans, and NO electric. I never had hot running issues on any of them, even in our 45c+ Summers.
BUT
The radiators were recored.
The fan hubs were NEW.
The pressure cap was new, and blew off within spec, which was a task in itself.
82c thermostat of the correct length.
If these fans worry you so much, I would simply use a relay and have them switch ON whenever the A/C is on. Very simple to do, and would probably help the A/C run colder, due to more air at low speed???, but I doubt you get our summer temps, so if its running hot, maybe there are other issues.
The V12's were the same, except they all had Efans fitted by me, and NO engine driven fan at all.
Senior Member
Joined: Apr 2013
Posts: 169
Likes: 35
you can always fit an auber instruments controller to set the fans to come on at what ever you choose, i run twin thermos in place of the viscous set to come on at 95 and off at 92, the a/c fan is still independent but comes on at 94
