Alfie Posted February 17, 2015 Share Posted February 17, 2015 I am looking to replace the standard radiator for my GT6 with an after market ally rad and need to know which thermostatic fan switch should be fitted, i have a choice of four different temperature ranges as follows -On 88 degrees Off 79 degreesOn 82 degrees Off 68 degreesOn 92 degrees Off 87 degreesOn 88 degrees Off 74 degreesThe car will be driven in the UK on the roads only. I've had a quick look in the owners manual and the information for the cooling stat is opening temp 79.5 to 83.5, fully open 93.5 to 96 degrees.Has anybody fitted an ally rad and if so what thermostatic fan switch did you fit? Quote Link to comment Share on other sites More sharing options...
Piero franchi Posted February 17, 2015 Share Posted February 17, 2015 is the engine standard Quote Link to comment Share on other sites More sharing options...
MickW Posted February 17, 2015 Share Posted February 17, 2015 Hi,I have a 2.5 L GT6 with a standard radiator. I had a boss put into the lower tank and fitted an 82 degree on thermo switch no idea what temperature it switches off. No problem with over heating since fitting.Mick Quote Link to comment Share on other sites More sharing options...
Alfie Posted February 17, 2015 Author Share Posted February 17, 2015 Yes the engine is standard. Quote Link to comment Share on other sites More sharing options...
Andy Flexney Posted February 18, 2015 Share Posted February 18, 2015 it depends if the switch is at the top or at the bottom of the radiator.At the top it needs to have higher values than if put in the bottom of the radiator. So if 95 on and 89 off are okay for the top you need something lower if putting in the bottom.AndyF Quote Link to comment Share on other sites More sharing options...
Alfie Posted February 18, 2015 Author Share Posted February 18, 2015 Thanks for all the reply so far guys it's greatly appreciated.The switch position is at the top of the rad and the engine is as standard, so does anybody know what the on off temperatures of the switch should be? Quote Link to comment Share on other sites More sharing options...
Dannyb Posted February 18, 2015 Share Posted February 18, 2015 I fitted one at the top into the thermostat housing. I used switch part number ICP-EFS5270 92C - 87C .This had a 3/8bsp thread. Quote Link to comment Share on other sites More sharing options...
Nick Moore Posted February 18, 2015 Share Posted February 18, 2015 My choice would be for the first option: 88 on, 79 off. The fan draws a large current, so the switch will last much longer if you use a relay. Quote Link to comment Share on other sites More sharing options...
Alfie Posted February 18, 2015 Author Share Posted February 18, 2015 Ok guys more info to digest.The rad i have has a M22 threaded switch mount at the top but my thoughts are that it would be more efficient at the bottom because the hot water comes in at the top and cold out of the bottom so if the radiator struggles to cool the water then the thermostatic switch situated in the bottom would register this and start the fan.Is this correct or am i missing the reason why the thermostatic switch is mounted in the top of the radiator OR do you have a higher on temp switch fitted to the top to compensate? Quote Link to comment Share on other sites More sharing options...
Alfie Posted February 18, 2015 Author Share Posted February 18, 2015 Ok i have just realized the thermostatic switch is positioned at the bottom of the after market radiator i have and not at the top as i originally stated, sorry for the confusion guys.Only need to know what on and off temp is required. Quote Link to comment Share on other sites More sharing options...
Royboy66 Posted February 18, 2015 Share Posted February 18, 2015 This site is quite good for helping choose a switch ... http://www.omniautos.force9.co.uk/sprite/m_cool.htm#ELECTRIC%20FANRoy 8) Quote Link to comment Share on other sites More sharing options...
Royboy66 Posted February 18, 2015 Share Posted February 18, 2015 I'm running a switch in bottom of Golf rad, 95-90 Roy Quote Link to comment Share on other sites More sharing options...
esxefi Posted February 19, 2015 Share Posted February 19, 2015 it will be a 'suck it and see' scenario.as said already the further along the cooling circuit you go the lower temp switch you need because of the thermal gradient across the radiator.play safe to start and use a low temp switch.if the fan comes on too early get a switch with a higher rating.they don't cost that much,you have to settle with what suits the engine and not what you think it needs. :) Quote Link to comment Share on other sites More sharing options...
RobPearce Posted February 19, 2015 Share Posted February 19, 2015 royboy66 wrote:I'm running a switch in bottom of Golf rad, 95-90 Roy That sounds high. Modern engines often switch the fan at 100 (or even 105) but that's based on engine coolant temperature (i.e. in the thermostat housing) which will be a lot hotter than the bottom of the rad. That said, as long as the bottom hose is colder than your target engine temperature it will still cool it, so it's not at all unreasonable to have the fan switched at a higher temperature than the thermostat, which is 82 or 88 IIRC. Quote Link to comment Share on other sites More sharing options...
Alfie Posted March 24, 2015 Author Share Posted March 24, 2015 What pressure rad cap is best suited for the header tank, the car is for road use only.Thanks Ian i did intend on switching by a relay. Quote Link to comment Share on other sites More sharing options...
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