Radiator fans don't turn on for cooling.

Ian Milne · Post by **Ian Milne** » Sat Jan 12, 2008 4:18 am

My Bongo, Friendee, which is a year 2000, second hand, import from Japan. It runs as sweet as a nut BUT it does have this coolant indication problem that has me a little worried. When the engine is up to temp. the temp. gauge sits at between 1145 and 1200hrs, at this temp I'd have thought at least one radiator fan would start. If I turn the air cond on, both rad. fans start and don't stop untill I turn the air cond off.
Both these fans have four wires going to them. I've bought a 2nd hand rad. from a brakers yard here, just in case I need it, both fans have only two wires for each fan. The rad. has the same dimensions as mine and I'm told the second hand rad. is from a petrol Friendee.
I've tried swapping a few of the relays, under the bonnet, about with no effect. The temp sensor that's at the top of the engine block, on the drivers side, (we're just like you guys, we're a RHD nation) I have measured the resistance of and it appears to be working in the fact it's a varable resistance (measured hot and cold). I've taken the advice on the site and shorted the one wire leading to this sensor to ground, the temp. gauge went full scale but no relay sound was heard (click) and the fan/s didn't start up. I've asked Mazda NZ about the problem, they've referred me to the local Mazda authrised repair agent (I'd not even take an enemies car there.)
My questions are 1, is there a relay that opperates the fan/s? As I doubt the ECU/EMU control them dirrectly, at least I hope not. If I knew where the relay was, at least I'd be able to confirm whether it worked or not.
And 2, is there such a thing as a wiring diagram to at least help me sort out in my brain, what's going on.
And 3, is there a temperature switch somewhere that turns the fan/s on, if so, where is it? I've looked in all the obvious places and can't find one.
Cheers, Ian Milne.

waycar8 · Post by **waycar8** » Sat Jan 12, 2008 12:39 pm

hello ian and welcome, the temp clock is normal at 1145 ish, as for the fans, cant help you but the sensor is under the center console near the hand brake

francophile1947 · Post by **francophile1947** » Sat Jan 12, 2008 1:11 pm

waycar8 wrote:hello ian and welcome, the temp clock is normal at 1145 ish, as for the fans, cant help you but the sensor is under the center console near the hand brake

Isn't that the sensor for the scavenger fan?

waycar8 · Post by **waycar8** » Sat Jan 12, 2008 1:17 pm

yes it is John,

, havent a clue why i wrote that

, sorry Ian, some reason i thought your were having problems with the scavenger fan not the rad fan

helen&tony · Post by **helen&tony** » Sat Jan 12, 2008 1:21 pm

Yes, Franco
That sensor is for the scavenger fan in the belly pan...I checked mine out last summer....as for the radiator fans, I can't say i've heard them much
Helen