Fan override switch

[AJV8]

Hi guys, has anyone round my sort of area had experience in putting in a fan override switch in and would fancy giving me a hand with putting one in mine? Have finally managed to get mine on the road, in a round about way, but sitting in traffic this morning the temparature just creeped up for the whole journey and by the time i got in to work it was just shy of the red.

Any tips anyone ? I'm not convinced i could hear the fans cut in anyway so i guess that might be the first port of call.

Thanks in advance,

AJ

[SILICONEKID340HP]

AJV8 said:

Hi guys, has anyone round my sort of area had experience in putting in a fan override switch in and would fancy giving me a hand with putting one in mine? Have finally managed to get mine on the road, in a round about way, but sitting in traffic this morning the temparature just creeped up for the whole journey and by the time i got in to work it was just shy of the red.

Any tips anyone ? I'm not convinced i could hear the fans cut in anyway so i guess that might be the first port of call.

Thanks in advance,

AJ

Just Pop a decent cable from under the dash with a high load switch ,i ran the cable through the bulk head and across the front near the Y piece then just wired it to the otter switch in parallel,easy job..

Or you could just change the otter switch for one which comes in at a lower temp

Edited by SILICONEKID340HP on Wednesday 21st March 10:32

[Barreti]

Has anyone seen/considered the X-fan from the chaps at X-Eng ?
http://www.x-eng.co.uk/X-Electrical.asp?MID=4

I'm about to buy one for the Land Rover as my Kenlowe sensor leaks constantly and is driving me up the damned wall.

[Harrytsg]

As mine is a daily driver I fitted the modwise 2 stage controller to mine, it brings the fans in earlier at half speed. Both half speed and full speed temperatures are adjustable to suit you/your car.
My full speed fans have only came on once during last summer while stuck in traffic.

[big geoff]

on the wiper switch you can wire up the rear wash connections and use that to opperate the cooling fan

[Nosh]

AJV8 said:

Hi guys, has anyone round my sort of area had experience in putting in a fan override switch in and would fancy giving me a hand with putting one in mine? Have finally managed to get mine on the road, in a round about way, but sitting in traffic this morning the temparature just creeped up for the whole journey and by the time i got in to work it was just shy of the red.

Any tips anyone ? I'm not convinced i could hear the fans cut in anyway so i guess that might be the first port of call.

Thanks in advance,

AJ

A few thoughts.....and from the lessons I learnt....

The temp gauge is not the most accurate on the dash.....

Even though I have new rad, new silicone pipes, new 82 degrees wide bore thermostat and new water pump, it still goes near the red......

Start the car - let it tick over and watch the temp gauge - if the fans kick in circa 90 degrees, then switch is working, if not, then it's the switch......( fuse, wiring etc....)

If the fans DO do come on, which way is the air being moved by the fans? You may have wired them wrong way round..... Eek!

Hope that helps....

Nosh

Edited by Nosh on Wednesday 21st March 17:35

Edited by Nosh on Wednesday 21st March 17:37

[tonys]

If you haven't already done so, you can test the fans by disconnecting the connections on the otter switch and joining them together, at least you'll know whether they actually work, and which way they blow.

If they do, it's quite possible that the otter switch is faulty, a fairly easy swap. Normally available from motor factors or TVR specialist - available in a couple of different temperature ranges.

Are you happy the rad is okay?

Lots on here on the search facility, or http://www.chimaerapages.com/

It is relatively easy to wire an override switch in to bypass the otter switch, but I'd check the basics first.

[plushuit]

AJV8 said:

Hi guys, has anyone round my sort of area had experience in putting in a fan override switch in and would fancy giving me a hand with putting one in mine? Have finally managed to get mine on the road, in a round about way, but sitting in traffic this morning the temperature just creeped up for the whole journey and by the time i got in to work it was just shy of the red.

This isn't exactly elegant..I wrote it a long time ago. Does it work for you?
http://www.gomog.com/allmorgan/bypass.html

AJV8 said:

I'm not convinced i could hear the fans cut in anyway so i guess that might be the first port of call. AJ

That bothered me as well. So I wired a small unused dash light with constant power and earthed it through both the rad bypass switch and the otter switch. Now I have a BIG fan that solves all issues with the bigger engines. The light allows me to verify that the fan is cycling on and off as it should.

SILICONEKID340HP said:

Or you could just change the otter switch for one which comes in at a lower temp

The only problem with that is the lower the range of the otter switch, the longer it will take for the fan to go off after you stop the car. I have seen fans run on for 10-15 minutes which gets the watching natives restless. If a lower range is installed, wire the fan power through the ignition switch.

Lorne

[Simon says]

plushuit said:

AJV8 said:

Hi guys, has anyone round my sort of area had experience in putting in a fan override switch in and would fancy giving me a hand with putting one in mine? Have finally managed to get mine on the road, in a round about way, but sitting in traffic this morning the temperature just creeped up for the whole journey and by the time i got in to work it was just shy of the red.

This isn't exactly elegant..I wrote it a long time ago. Does it work for you?
http://www.gomog.com/allmorgan/bypass.html

AJV8 said:

I'm not convinced i could hear the fans cut in anyway so i guess that might be the first port of call. AJ

That bothered me as well. So I wired a small unused dash light with constant power and earthed it through both the rad bypass switch and the otter switch. Now I have a BIG fan that solves all issues with the bigger engines. The light allows me to verify that the fan is cycling on and off as it should.

SILICONEKID340HP said:

Or you could just change the otter switch for one which comes in at a lower temp

The only problem with that is the lower the range of the otter switch, the longer it will take for the fan to go off after you stop the car. I have seen fans run on for 10-15 minutes which gets the watching natives restless. If a lower range is installed, wire the fan power through the ignition switch.

Lorne

The fans dont run after you switch off the car

[plushuit]

Simon says said:

he fans dont run after you switch off the car

Ah! Then TVRs are wired smarter than Morgans and other cars. Normally, on most vehicles, the rad fan feed is battery fed and not run through the ignition. (You have often heard a just-parked car's rad fan running. Google some other fan motor diagrams.) There are some who say that it is important to have the fan working as the engine heat spikes immediately after you turn it off and therefore air circulation becomes important.

However, I am not one of that crowd. I figure the rad fan, pulling air through a still hot rad, has to be relatively useless without coolant circulation.

L.

[Simon says]

plushuit said:

Simon says said:

he fans dont run after you switch off the car

Ah! Then TVRs are wired smarter than Morgans and other cars. Normally, on most vehicles, the rad fan feed is battery fed and not run through the ignition. (You have often heard a just-parked car's rad fan running. Google some other fan motor diagrams.) There are some who say that it is important to have the fan working as the engine heat spikes immediately after you turn it off and therefore air circulation becomes important.

However, I am not one of that crowd. I figure the rad fan, pulling air through a still hot rad, has to be relatively useless without coolant circulation.

L.

Be good way of shifting temp build up under the TVR bonnet though, as temps can soar under the bonnet on a hot day especially with all the cats intact