Manual Override Switches: Engine Cooling Fan and Fuel Filter Heater Here’s a couple of ideas I have had for new switches on the dash-board. First, there have been a few occasions when I would have liked to manually turn-on the engine cooling fan to pre-emptively cool the engine whilst driving up hills. Find great deals on eBay for fan override switch. Shop with confidence. Hello all, does anyone here have a manual fan switch factory installed. If you have a Volvo engine you need to wire the manual switch to the. I tried to track the airline to the control solenoid but lost it in the mess of wires. Switching of your radiator fan in lieu of the existing fan control switch (which is. A switch (for the manual override or use one of the existing ones on the dash). Don't forget to remove the existing rad fan control switch from the circuit at the. Car Engine SchematicI have a Kenlowe fan that is operated by a thermostatic switch installed in the hose between engine and bottom hose of radiator (as sold by Moss) I wish to fit an underdash manual override switch with warning light to advise when the fan is running. Some of you may say 'why? When the fan cuts in or out as required automatically' Well, it's all for peace of mind really. Anyways, does anyone have a schematic diagram of the wiring required to achieve this? RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog. Saturn aura repair manual for 08. I understand that I may have to fit a relay? Thanks guys for your valuable advice. It transpires that the present setup does not have a relay (oops!) I tend to think that the original installation of the Kenlowe was too simple for its own good. A live feed from the fusebox to the fan, through the inhose thermostatic switch and then to earth. It worked but it cannot be good can it? I understand that these fans can pull 25 amps on start up.My plan is to fit a 30 amp relay as per Neil's diagram but what gauge/ colour cable is best for this application. I am thinking 3 or maybe even 4 mm? A number of the usual suppliers can sell you the metal pipe, which carries the coolant from the bottom of the radiator back to the pump, with a built-in boss for a thermostatic switch, which they can supply, of course. This is very convenient and overcomes the problem of weeping from whichever hose connection might be used. As Roger has mentioned, a relay should be used in order to avoid a hefty current being switched by the thermostat - should the contacts get damaged over time, it's far easier to swap a relay than the thermostat. The original 1970 Kenlowe offering included a little metal bracket, which could be attached to the underside of the dashboard. The bracket housed a manual over-ride switch and a lamp which indicated that power was being fed to the fan (which, therefore, should be running!). I bought my fan from Kenlowe and came wth a wide thick rubber band which slipped over the radiator tope hose inlett. This band had a groove in it which the capillary tube to the sensor bulb was laid in. The hose is then slipped over it as per normal with the hose clip tightened directly over the band. No leaks or weeps so far and have had it apart a couple of times dealing with thermostat issues. I did wonder if the sensor bulb would restrict water flow as it sits in the radiator inlet but doesn't seem to. LNK has a thermo switch in the downpipe. However, in addition to being a safe guard for overriding a failed switch it can also be used to avoid heat soak Switch it on manual just as you join a stationary queue of traffic and it will hold the heat soak at bay and avoid a temp spike as it tries to handle peak temp without normal airflow NB: Not a lover of the 'kenlow' switch so used the existing rheostat switch hole, much nicer (IMHO) hi Mike, I have one of the pipes in my garage ready to fit, but am unsure which of the sensors to fit. I have looked at the moss site and they sell about 5 different sensors all with a different on/off range. Can I ask which ond you chose to fit and if the override gets used much. This morning spookily I was planning to use my infra red temperature toy (from maplins) to see what the temperature of the original metal pipe is at various gauge readings to see what sensor would be the best compromise. Also plan on the manual switch (you never know). But I'd also like you opinion as you have done it already. Hi Mark, when determining what temp range you need for the thermostat you must also consider the thermostat in the top housing that controls water flow. I use a Summer stat (76'C) in the Summer ( ) and a winter stat 82'C in the winter. So an in pipe stat would need to come on after 82' and go off some where lower than 82'. The complication comes in that the rad down pipe may/will run cooler than the top housing. However generally the rad fan is required when the car is stationary.
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