Hi,
I have an Ht racing 2.0 pinto in my F27 and i am now looking at fitting a auto fan switch but unsure on temps.

Does anyone know the optimum running temp of a 2.0 pinto and what temp the fan shoudl switch on.

I am looking at the little inline fitting from rally design, guessing it goes in the bottom hose. Can anyone recomend a fan siwtch to work with this set up??
thanks in advance

goaty

You won't find a road car with fan switch in the bottom hose.

Trouble with fitting one in the bottom hose is in that position it should never see temps anything hotter than quite warm.


Generally the best place to fit one is halfway up the raddiator but if you haven't got a provision in the rad you can't do that.

If you have only the top and bottom hoses available for mounting I would sugest putting an 87/82C switch in the bottom hose and 100/95c one in either the top hose or by-pass hose and wiring them in parallel so either or both will turn the fan on

I should add the running temperature is controlled by the thermostat which normally starts to open at 88c.

Also remember the thermostat won't operate properly unless you have a by-pass hose fitted

where does the by pass hose run from and to??
I will have a look at my rad 2mo and see what connections it has.
Also, should the expansion tank fill to the bottom hose??

thanks

[Edited on 19/10/08 by goaty]

If you do search you will find a few posts on Pinto cooling system layouts.

Generally the expansion tank should go to the top hose or cylinder head.

The by-pass hose runs from the cylinder head (usually thermostat housing on the engine side of the thermostat ) back to the small bore connection on the water pump. On a lot Fords the heater didn't have a water valve and so served as part of the by-pass circuit.

You may find it helps bleeding air out the system and thermostat operation if you drill a couple of 2mm bleed holes in the valve plate of thermostat.

rule of thumb that works is:

thermostat 85 C
rad fan 95 C

you can drill hole in radiator to fit a temp switch oppositve the top hose so you can get to fit the nut inside the radiator.

right, i had a little peak today and got a couple of pics.

I dont have the fitting on the rad to have a switch so i am leaving that as i dont want to drill it really.

What i am not sure on though is what i am showing in the pics, it has a filling cap on it and the relief pipe runs to a small tank.






Do i have to keep this in or can i get rid of this all together and use my ally expansion tank instead??? It does have a switch or sensor off the back of it. Any ideas what it is??? i didn't have time to trace it.

many thanks again to all.

right, i had a little peak today and got a couple of pics.

I dont have the fitting on the rad to have a switch so i am leaving that as i dont want to drill it really.

What i am not sure on though is what i am showing in the pics, it has a filling cap on it and the relief pipe runs to a small tank.






Do i have to keep this in or can i get rid of this all together and use my ally expansion tank instead??? It does have a switch or sensor off the back of it. Any ideas what it is??? i didn't have time to trace it.

many thanks again to all.

anyone know? i assume that the switch is the temp sensor......