Dixa1225 Posted June 7, 2016 Share Posted June 7, 2016 Replaced fan switch due to leaking on a new radiator . Fan will not cut in on new switch . Both Top & Bottom hoses are hot so does not appear to have a airlock . By passing the switch by joining the wires together kicks the fan in .Any advice appreciated Link to comment Share on other sites More sharing options...
elie boone Posted June 7, 2016 Share Posted June 7, 2016 did your replacement switch has the same operating temp ? it's marked on the side of it Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Hi Elie , Yep same markings 98-93 purchased from redline Link to comment Share on other sites More sharing options...
SM25T Posted June 7, 2016 Share Posted June 7, 2016 I reckon air in top of radiator ... so switch not in the water. Test wiring by removing connector from switch and touching wires together with ignition on. It will spark and fan runs. Link to comment Share on other sites More sharing options...
SM25T Posted June 7, 2016 Share Posted June 7, 2016 Ah .... I see you tested wiring. Def air in top of radiator. Link to comment Share on other sites More sharing options...
garybee Posted June 7, 2016 Share Posted June 7, 2016 By bypassing the switch you've already tested the rest of the circuit. The switch must be either faulty, not reaching it's switching temperature or not immersed in coolant. Is it possible that there is air in the system where the switch is mounted (Possible with some installations, but I don't know what engine/cooling system you have)? Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Hi SM25TYep , wiring fine , joined wires together and fan cut in . Rad is hot top and bottom . Any idea how to remove the airlock ? Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 The engine is a K series Link to comment Share on other sites More sharing options...
Area Representative paul richards Posted June 7, 2016 Area Representative Share Posted June 7, 2016 Bleed by opening the bleed screw on top of radiator then remove cap from expansion tank. Be ready to put bleed screw back in as soon as coolant appears. Top up expansion tank as necessary and replace cap. Link to comment Share on other sites More sharing options...
garybee Posted June 7, 2016 Share Posted June 7, 2016 I'm not near my car at the moment so can't check. Is there a small hose connector right at the top of the radiator near the fan switch? Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Hi Paul,No bleed screw on top of rad but does have a hose to a t-piece that goes to the expansion bottle , going to take this of and back fill top of the rad .Many thanks Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Hi GarybeeYes to : Is there a small hose connector Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Just backfilled via bleed hose by fan switch . Still no luck , Beginning to think I have a faulty fan switch Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 7, 2016 Member Share Posted June 7, 2016 How about testing it with a saucepan of hot water, a thermometer and a multimeter?Jonathan Link to comment Share on other sites More sharing options...
garybee Posted June 7, 2016 Share Posted June 7, 2016 "Yes to : Is there a small hose connector"It sounds like you've removed any air from there which is all I was going to suggest. Did coolant spill out (from the rad') when you disconnected the hose?This just leaves you with faulty switch or wrong switch then. Either way the one you have is of no use to you. Before you get another switch though, how sure are you about the temperature reading? Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Just an update, swap back to the old switch with a new gasket, Fan cuts in fine . Link to comment Share on other sites More sharing options...
SM25T Posted June 7, 2016 Share Posted June 7, 2016 98 is quite high to switch the fan on. Mine is 95 I recall. Link to comment Share on other sites More sharing options...
garybee Posted June 7, 2016 Share Posted June 7, 2016 Result! Duff new part it was then. Leak gone? Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Hi SM25T,Fan cuts in at 95 on the old switch , I have a Stack temp gauge and know it reads fine. Thanks for your help on this . Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Ha , regarding the leak , ok at the moment but don't want to temped fate !! Link to comment Share on other sites More sharing options...
Dixa1225 Posted June 7, 2016 Author Share Posted June 7, 2016 Thanks for your help on this Link to comment Share on other sites More sharing options...
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