daveyc123 Posted June 23, 2018 Share Posted June 23, 2018 I'm trying to fit an electric fan sensor on my viva. I bought a hose adaptor but my top radiator hose isn't long enough to house it. I feel it will kink the hose. What other options do I have? Could I tap a hole into the top of the thermostat housing? The obvious thing would be the bottom radiator hose, but I was told the sensor should be in the top hose. Any help appreciated! 1 Quote Link to comment Share on other sites More sharing options...
tortron Posted June 23, 2018 Share Posted June 23, 2018 Can get a fitting soldered into the radiator 4 Quote Link to comment Share on other sites More sharing options...
daveyc123 Posted June 23, 2018 Author Share Posted June 23, 2018 As easy as that! I will speak to a radiator specialist! Thank you Quote Link to comment Share on other sites More sharing options...
66gt Posted June 23, 2018 Share Posted June 23, 2018 Or use the old school capillary tube that slides between the radiator hose and the radiator flange 1 Quote Link to comment Share on other sites More sharing options...
NickJ Posted June 23, 2018 Share Posted June 23, 2018 As I understood the sensor went on the bottom hose for fan switching, or is that just another way? Quote Link to comment Share on other sites More sharing options...
tortron Posted June 23, 2018 Share Posted June 23, 2018 5 minutes ago, NickJ said: As I understood the sensor went on the bottom hose for fan switching, or is that just another way? Either way you like tbh, you just pick the right temp switch for what you want 2 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted June 23, 2018 Share Posted June 23, 2018 Could put it into the the thermostat housing, that's how Toyota 4Ks do it. Might introduce too much stress and cause a crack though. But yeah, you'd want a lower temp switch for radiator outlet hose otherwise your engine would run too hot. That and the fact that the outlet temperature of the radiator is nowhere near as directly correlated with the engine temperature as the inlet. Quote Link to comment Share on other sites More sharing options...
187inc Posted June 23, 2018 Share Posted June 23, 2018 Have you already bought the sender? Only asking as I had one that looks the same as you have, and I couldn't for the life of me find a sender that was the right temp range I wanted in that thread.. (1/8bsp I think?) just something to consider before you go chopping hoses etc. If I was gonna do it again I'd probably get one welded in radiator top near Inlet. 1 Quote Link to comment Share on other sites More sharing options...
daveyc123 Posted June 23, 2018 Author Share Posted June 23, 2018 I have the sender, everything is all wired in! I have picked up an original fan (I didn't have one) so my current thoughts are to fit the original fan and just have the electric fan on a switch in case of over heating. At a later date I can look into getting the radiator drilled to take a sensor! Quote Link to comment Share on other sites More sharing options...
sr2 Posted June 25, 2018 Share Posted June 25, 2018 For monitoring engine temperature (i.e. to control a gauge) the sender needs to be mounted in either the top radiator hose or preferably in the thermostat housing. Reason being is that the objective is to show the temperature of the water coming from the engine not the radiator. The sender is essentially a temperature controlled rheostat. The job the OP’s ‘electric fan sensor’ is required to perform is to switch on the cooling fan when the supply of cooled water from the radiator (i.e. the bottom hose supplying the engine) is insufficient to allow the thermostat to keep the engine at the optimum stable temperature. Put simply the fan sensor switch is there to regulate the temperature of the water the radiator is delivering to the motor, not the temperature of the motor itself. Temp gauge sender in the top rad hose (or thermostat housing) and radiator fan temp switch in the lower hose. Hope this clarifies the issue. 2 1 Quote Link to comment Share on other sites More sharing options...
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