Cooling fans

Cooling fans

Author
Discussion

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
My fans never cut in during the MOT test so it got a bit hot, how's the best way to check the fans, If I put a wire across the 2 wires that go to the otter switch will that make the fans work , excuse my ignorance if I'm wrong

Number 7

4,103 posts

262 months

Sunday 29th November 2015
quotequote all
Certainly does on Wedges - ignition on of course. And keep clear of the fan blades. If the fans work, you've got a suspect otter switch. If they dont, maybe a fuse or relay down.

MSamps

53 posts

112 months

Sunday 29th November 2015
quotequote all
You are correct, connecting the two contacts together will bring on the fans (ignition has to be on). If fans turn on then your otter switch needs replacing. If nothing happens then clean up the two plastic connectors that go to each fan located at the bottom of the radiator as these can get dirty.

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
Thanks, I have a sort of humming noise when I done it but no movement from the fans

MSamps

53 posts

112 months

Sunday 29th November 2015
quotequote all
Hmm, could be the motor is trying to work but the fans are seized? Just a guess but best wait for someone else to turn up who may have experienced this before.

Number 7

4,103 posts

262 months

Sunday 29th November 2015
quotequote all
With ignition off, the blades of the fans should turn very freely by hand. If not, the motor(s) gone.

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
If it is that the fans are knackered where is the best place to get new ones including after market jobbys.

Number 7

4,103 posts

262 months

Sunday 29th November 2015
quotequote all
You need to establish the make of fan you have first: Kenlowe, Spal, Davies Craig etc. as they will all likely have different ways of mounting. Some may have detachable blades, in which case you should just be able to buy the motor, or some may be integral. Usually fans have labels on the motor.

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
Just managed to partly take fan housing off the radiator (can't get single bottom bolt) and have found that the fan has come off the motor shaft, tested motor on 12v battery and works fine, so no power to motor I'm guessing, have put fan back on motor shaft but just need a new circlip washer now to secure it , when I arc the 2 main wires to the otter switch together I can hear the relay clicking. Could it still be a fuse or is it more than likely the wiring between the otter switch and the fans, the fans are Spal ones

portzi

2,296 posts

175 months

Sunday 29th November 2015
quotequote all
Seandenyer said:
If it is that the fans are knackered where is the best place to get new ones including after market jobbys.
Remove the fan andSpray some WD40 or a penetrating fluid on the rotating internals and let it soak overnite. X works did this to one of my fans 7 years ago and its still working, ooopst l have just cursed my fans also????

Hoofa

3,151 posts

208 months

Sunday 29th November 2015
quotequote all
Just s though I had a problem with only one fan running, found the fan connectors badly corroded, might be worth checking them I replaced mine with some DTM connectors

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
portzi said:
Remove the fan andSpray some WD40 or a penetrating fluid on the rotating internals and let it soak overnite. X works did this to one of my fans 7 years ago and its still working, ooopst l have just cursed my fans also????
Will try that thanks

Seandenyer

Original Poster:

320 posts

120 months

Sunday 29th November 2015
quotequote all
Hoofa said:
Just s though I had a problem with only one fan running, found the fan connectors badly corroded, might be worth checking them I replaced mine with some DTM connectors
Will try this too