cooling fans fuse keeps blowing

[Jonny TVR]

is there a cure for this?

[Hamish400]

With engine stopped check if the fan spins freely. If the fan bearings are a bit tight fan will draw more current which could cause fuse to blow.
Regards Hamish

[pac1uk]

I would also check the connector block as well, these are exposed to all weathers and can corrode. Leading to increase in Resistance and causing fuse to blow.

[Jonny TVR]

Going to try a 40 amp slow fuse first. Then it might be that I need to replace the fans

[phillpot]

Jonny Bodge said:

Going to try a 40 amp slow fuse first. Then it might be that I need to replace the burnt out wiring loom

[Jonny TVR]

phillpot said:

Very funny! My specialist garage suggested it. Might try a lower amp first.

Edited by Jonny TVR on Tuesday 19th March 16:03

[Zeb74]

Stupid question, but are you sure it is spinning in the good direction?
I know that few years ago Rover has mounted fans inverting the polarity of the motor, they were blowing hot air in front of the car.

[Jonny TVR]

Zeb74 said:

Stupid question, but are you sure it is spinning in the good direction?
I know that few years ago Rover has mounted fans inverting the polarity of the motor, they were blowing hot air in front of the car.

Its a good point but they aren't turning on

[TwinKam]

First step is to see if each fan turns freely, then see if they each work when powered direct to their connector (and ideally measure the current they draw). If all is well, you then need to trace the wiring back, looking for shorts.

[dlewis]

There is an oil point at top of each motor, IIRC.

Connect a direct fused supply to each fan separately and go from there.
Dave

[ianwayne]

Can you cross connect them and connect one at a time? There is enough slack in the loom to do this on a Chimaera. I did this to establish if it was the supply or the fan itself I had issues with.

[Steve_D]

Jonny TVR said:

Zeb74 said:

Stupid question, but are you sure it is spinning in the good direction?
I know that few years ago Rover has mounted fans inverting the polarity of the motor, they were blowing hot air in front of the car.

Its a good point but they aren't turning on

Slightly irrelevant as they would likely draw about the same current irrespective as to which way they were rotating.

Steve

[Zeb74]

Steve_D said:

Slightly irrelevant as they would likely draw about the same current irrespective as to which way they were rotating.

Steve

When the car is not moving of course, but as soon as you take speed the electric engine is trying to rotate in opposite way dictated by the aerodynamic laws.

[Byker28i]

Jonny TVR said:

phillpot said:

Very funny! My specialist garage suggested it. Might try a lower amp first.

Think logically. You fuse is blowing because it's drawing significantly more current that it should. It's a safety feature, yet you think you should replace this with one rated twice the normal rather than find out why it's drawing too much current.

Also seriously think about your specialist garage if they are suggesting this.

[TwinKam]

Byker28i said:

Jonny TVR said:

phillpot said:

Very funny! My specialist garage suggested it. Might try a lower amp first.

Think logically. You fuse is blowing because it's drawing significantly more current that it should. It's a safety feature, yet you think you should replace this with one rated twice the normal rather than find out why it's drawing too much current.

Also seriously think about your specialist garage if they are suggesting this.

To be fair, he made no mention of what they claimed to be specialists in...

[Steve_D]

Just looked back through this thread.
Missed the most relevant point. It keeps blowing fuses but the fans are not running.
Seems to me it will keep blowing any size fuse until the fault is found and sticking a larger fuse in will most likely burn out the wiring.

OP has been asked if the fans can be turned by hand but I have not seen a reply.
It has been suggested to power the fans directly at the connectors just below the rad but again no reply.

Steve

[Jonny TVR]

Steve_D said:

Just looked back through this thread.
Missed the most relevant point. It keeps blowing fuses but the fans are not running.
Seems to me it will keep blowing any size fuse until the fault is found and sticking a larger fuse in will most likely burn out the wiring.

OP has been asked if the fans can be turned by hand but I have not seen a reply.
It has been suggested to power the fans directly at the connectors just below the rad but again no reply.

Steve

Thanks guys and I've been busy! Will look at it this weekend and report back

[rev-erend]

Check if there is a lubrication hole in the fan for the bearing ..

[QBee]

I seriously wouln't put a bigger fuse in.
I had a cooling fan bearing fail on a brand new Renault 25 I owned in the 1980s.
There wasn't a fuse in the circuit.

It jammed the fan blades on the radiator and melted the wiring loom, setting fire to the engine bay.
The repairs cost half the value of the car and took four months. The bearing was worth less than £10.

Unlike the steel a Renault is made of, TVR fibreglass burns very brightly.

[TwinKam]

QBee said:

some seriously important stuff.
Then,
Unlike the cheese a Renault is made of, TVR fibreglass burns very brightly.

Fixed that for you Anthony