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Ok, when I replaced original 1.3L with low mile Japanese 1.6L from Japanese market 323, I used the fan switch that came with the Japanese engine and used one Bosch relay. Did it the normal way rather than the festiva way. The Japanese switch closes when it reaches temp, not open like the Festiva switch. Not hard to wire with one generic Bosch relay for switch closing when it reaches temp. I've used it like this for some years.
But recently when I changed thermostats, managed to break the grey plastic end off the switch. You can get one of the grey end switches even though they were never used in American market, but its shipped from Europe at horrible price. Looked on RockAuto.com and they had three others shown for the American market 323. I picked one (eenie, meanie, miney, mo since they dont give thread sizes or other specs) and used the RockAuto part number to find a $10 one on ebay. Fine, I get it. but its has 3/8 NPT threads, not the slightly smaller metric that Festiva/Japanese323 uses. Unless i want to gamble on it holding by one or two threads, not going to work.
Two choices, I still have the one off the OEM Festiva engine or I can make an adapter to splice into the upper radiator hose that the new switch will fit. Lazy and didnt want to get welder out and hunt pieces so thought how to make Bosch relay control using the Festiva switch. You cant do it with one 5 terminal Bosch relay, best you can accomplish using only one, is that it will run all time that the coil in the relay isnt energized. Even with engine off. But with two 5 terminal generic Bosch relays you can. You have first relay set so when you turn ignition switch (I connected relay coil wire to positive terminal on ignition coil), relay coil is energized and output at terminal 87. Grounded terminal 85 permanently on first relay. Then connected output termial 87 to terminal 86 and terminal 30 on the second relay. Terminal 85 on second relay goes to Festiva fan switch. Terminal 87A on second relay goes to fan. If this is too confusing there is loads of info on wiring generic Bosch relays on web. Its handy to get familiar how to wire Bosch relays.
Works. When I have ignition on, engine running or not, and pull wire off the fan switch, fan comes on, just like with original factory relay setup. Also when engine warms up and switch opens, fan comes on. Goes off when fan cools radiator enough for switch to close.
Just mentioning this little tidbit of info for anybody not wanting to spend $40 on new OEM Festiva fan switch relay. You can either salvage 5 terminal generic Bosch relays from junk cars (usually several on any particular car if you dig deep enough). Or if you buy several at a time can get heavy duty new ones WITH socket to plug them into off ebay for two or three bucks each. Lot more expensive if you just buy one or two at a time. I keep bag of new ones around. Never know when you need one for horn or lights or whatever. Very handy to have. The 5 terminal ones give you lot more flexibility. The first relay as I described my setup can be a four terminal one, but second needs to be five terminal as you need terminal 87A available.
I will still make an adapter one of these days since I own this oddball fan switch I just bought. If I dont use it on Festiva, might use it on something else. I am one of those people that dont like using manual switch for radiator fan or letting radiator fan run all the time. Though I know lot people do this on electric fan cars. I mean why when you can get a switch for ten bucks or even less. You do want to use a relay or relays, dont splice the switch directly into wire to fan. They arent designed for that much currant.
But recently when I changed thermostats, managed to break the grey plastic end off the switch. You can get one of the grey end switches even though they were never used in American market, but its shipped from Europe at horrible price. Looked on RockAuto.com and they had three others shown for the American market 323. I picked one (eenie, meanie, miney, mo since they dont give thread sizes or other specs) and used the RockAuto part number to find a $10 one on ebay. Fine, I get it. but its has 3/8 NPT threads, not the slightly smaller metric that Festiva/Japanese323 uses. Unless i want to gamble on it holding by one or two threads, not going to work.
Two choices, I still have the one off the OEM Festiva engine or I can make an adapter to splice into the upper radiator hose that the new switch will fit. Lazy and didnt want to get welder out and hunt pieces so thought how to make Bosch relay control using the Festiva switch. You cant do it with one 5 terminal Bosch relay, best you can accomplish using only one, is that it will run all time that the coil in the relay isnt energized. Even with engine off. But with two 5 terminal generic Bosch relays you can. You have first relay set so when you turn ignition switch (I connected relay coil wire to positive terminal on ignition coil), relay coil is energized and output at terminal 87. Grounded terminal 85 permanently on first relay. Then connected output termial 87 to terminal 86 and terminal 30 on the second relay. Terminal 85 on second relay goes to Festiva fan switch. Terminal 87A on second relay goes to fan. If this is too confusing there is loads of info on wiring generic Bosch relays on web. Its handy to get familiar how to wire Bosch relays.
Works. When I have ignition on, engine running or not, and pull wire off the fan switch, fan comes on, just like with original factory relay setup. Also when engine warms up and switch opens, fan comes on. Goes off when fan cools radiator enough for switch to close.
Just mentioning this little tidbit of info for anybody not wanting to spend $40 on new OEM Festiva fan switch relay. You can either salvage 5 terminal generic Bosch relays from junk cars (usually several on any particular car if you dig deep enough). Or if you buy several at a time can get heavy duty new ones WITH socket to plug them into off ebay for two or three bucks each. Lot more expensive if you just buy one or two at a time. I keep bag of new ones around. Never know when you need one for horn or lights or whatever. Very handy to have. The 5 terminal ones give you lot more flexibility. The first relay as I described my setup can be a four terminal one, but second needs to be five terminal as you need terminal 87A available.
I will still make an adapter one of these days since I own this oddball fan switch I just bought. If I dont use it on Festiva, might use it on something else. I am one of those people that dont like using manual switch for radiator fan or letting radiator fan run all the time. Though I know lot people do this on electric fan cars. I mean why when you can get a switch for ten bucks or even less. You do want to use a relay or relays, dont splice the switch directly into wire to fan. They arent designed for that much currant.