Rad fans , switches...am I trying to complicate things

Post by: **terryp** » Sun Sep 20, 2009 11:43 am

Whist out in the car today I had a eureka moment.
I had intended to control my fan with a Revotec in line controller , opting to move away from the otter switch and its necessary manual overide but I suddenly thought ...Why?
The original engine was designed to have a mechanical fan running all the time. I have a manual overide switch and the car runs virtually at the thermostat temp with this on. I switch on when the engine warms up and leave it on unless I'm on the open road at 60mph.
My question is that with the thermostat being the brains of the engine as far as temperature is concerned , by installing a switch with another temperature setting would this create another brain as it were and consequently have two brains not knowing what the other is doing!!!
Or is the way to automate the switching on the overide switch, ie have the switch come on at thermostat temp?
Any thoughts gratefully received!
Terry

Post by: **stuartgb100** » Sun Sep 20, 2009 12:23 pm

Terry,

I think there was an answer in your earlier Otter post.

The way I did it was to choose the thermostat I wanted (in my case 72 degrees).

Once fitted, I ran the engine up to normal temperature - a few runs out will soon show the normal
temperature with the car moving (not stationary).

I want the car up to normal temperature but not getting too hot.
So I set the electronic fan control to kick in approx 10 F degrees above that.
It then kicks in and drops the temp by about 5-6 degrees.

If you set it too close, it will end up fighting the thermostat.

Regards,
Stuart.

Post by: **terryp** » Sun Sep 20, 2009 12:26 pm

Stuart
How do you mean fighting the thermostat. As I understand it the fan would only make the radiator more efficient, nothing more?

Terry

Post by: **curly type 26** » Sun Sep 20, 2009 3:31 pm

Hi Stuart, where did you source 72dg stat from, lowest i could find was 75degs. Th

anks in advance Curly.

Post by: **alexblack13** » Sun Sep 20, 2009 7:32 pm

Colin, Have you tried Susan Millar? I am sure I got my one from her.

Alex B....

Post by: **terryp** » Sun Sep 20, 2009 7:41 pm

Susan only had a 76degree, I ordered a 74degree from TTR when it turned up it was a 75(!!!!) You can get a 74degree from eBay QH QTH101 or from Steve at SJS but for the ultimate if you can find one (I did!) a 71degree QTH170 (For a Ford Transit)

Terry

Post by: **fatboyoz** » Mon Sep 21, 2009 12:16 am

Terry,
72 degree thermostat fitted and 75 Degree ON/70 degree OFF thermatic fan switch also fitted. The thermostat opens at 72, the fan starts at 75 and drives the temp' down toward 70, as this occurs the thermostat starts to close, at 70 the thermostat is closed and the fan stops, the temp' starts to go up again and the whole cycle is repeated.

Swap the thermatic switch for an 80 ON/75 OFF. The thermostat opens, and remains open, at 72. As the temp' climbs to 80, the fan starts and drives the temp' down to 75 and the fan stops. The temp' is thus controlled by the fan whilst the thermostat remains fully open. If the thermostat manages to hold the temp' below 80, the fan will not start.
Colin.

terryp wrote:Stuart
How do you mean fighting the thermostat. As I understand it the fan would only make the radiator more efficient, nothing more?

Terry

Post by: **terryp** » Mon Sep 21, 2009 6:30 am

fatboyoz wrote:Terry,
72 degree thermostat fitted and 75 Degree ON/70 degree OFF thermatic fan switch also fitted. The thermostat opens at 72, the fan starts at 75 and drives the temp' down toward 70, as this occurs the thermostat starts to close, at 70 the thermostat is closed and the fan stops, the temp' starts to go up again and the whole cycle is repeated.

Swap the thermatic switch for an 80 ON/75 OFF. The thermostat opens, and remains open, at 72. As the temp' climbs to 80, the fan starts and drives the temp' down to 75 and the fan stops. The temp' is thus controlled by the fan whilst the thermostat remains fully open. If the thermostat manages to hold the temp' below 80, the fan will not start.
Colin.

terryp wrote:Stuart
How do you mean fighting the thermostat. As I understand it the fan would only make the radiator more efficient, nothing more?

Terry

Colin / Stuart
Thanks - I got it now!
(Its a good job I won the in line Revotec switch on ebay last night!)

Post by: **curly type 26** » Mon Sep 21, 2009 7:39 am

Thanks for info chaps, & now to try & find that transit stat Terry, let you know if find source. Curly

Post by: **terryp** » Mon Sep 21, 2009 8:12 am

Curly
The QTH170 one I found was exactly like a QTH101. However , this is on eBay at the moment http://cgi.ebay.co.uk/FORD-TRANSIT-A-SE ... 286.c0.m14

It may be worth a try and its an original Ford part!

Terry

Post by: **stuartgb100** » Mon Sep 21, 2009 8:13 am

Went to my local factor for a 72 degree stat last week.
Checked his QH catalogue only to find that theQTH167 was showing as 74 degrees.
Didn't order one.

When home, phoned QH's technical department. They confirmed it is 72 degrees.
Said it must be a print error in the catalogue.
I now have a spare stat.

If you order one, I would suggest you make sure it's a genine QH part, just to be sure.

Regards,
Stuart.

Post by: **terryp** » Mon Sep 21, 2009 8:17 am

Curly
HOLD THE BUS!!!!

http://cgi.ebay.co.uk/FORD-A-SERIES-DIE ... 286.c0.m14

All the best

Terry

Post by: **terryp** » Mon Sep 21, 2009 8:24 am

Stuart/Curly
The 167 has a daggley bit underneath in the catalogue????
See page 122 http://www2.qha.com/catalogues/QH03-QTH.pdf

Terry

Post by: **curly type 26** » Mon Sep 21, 2009 9:33 am

Great stuff chaps have bought stat off ebay, not a lot of money. But if no good im sure my wife would love one for xmas! Curly :lol:

Rad fans , switches...am I trying to complicate things

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