My 425 fan failed!!

pequeajim · Apr 19, 2005

I noticed yesterday after cutting the grass that the cooling fan on my 425 was not running.

I checked the fuse and it was blown. I replaced it and mowed some more but even though the temp was hot enough, the fan still did not run.

I checked the fuse again and it was ok this time.

I checked the temp sensor contacts and they were closed when the oil is hot and open when it cools off.

I took the fan off to see if anything was not right and it all looks ok. The fan spins freely too!

Any other suggestions?

cqaigy · Apr 19, 2005

you gettting voltage to the fan? or you could check resistance across fan or even run power to it directly to see if it spins.

MossRoad · Apr 20, 2005

I agree. Run power to the fan directly and see if it spins.

stray · Apr 20, 2005

If the motor is bad it couldn't be much different from the set up used on radiators of automobiles. Might be one could match one from a junk yard? Motor, fan, guard and all.

pequeajim · Apr 20, 2005

</font><font color="blue" class="small">( I agree. Run power to the fan directly and see if it spins. )</font>

Moss: I think I read that you have done this with some wire and allegator clips in the past. Where did you connect them?

Battery positive to ?

Negative to chassis?

tracdoc · Apr 20, 2005

Pequeajim,

Maybe take a look at this thread {HERE} from few months ago. Also, FOURTEEN has recommended a number of times jumping the fan circuit such that the oil cooling fan remains ON all the time.

Let us know what you find.

MossRoad · Apr 20, 2005

Not me. Mine's always worked. /forums/images/graemlins/crazy.gif

I'm guessing just take a couple of wire leads and clip them from the battery directly to the fan leads just to see if it spins. If it does, look for the problem elsewhere. If not, the fan motor is probably bad.

pequeajim · Apr 20, 2005

I was looking for the fan leads (bare point of contact), last night. I even took the fan off but the leads on the fan side are sealed, (understandably). I can see the one lead coming off of the temp. switch which I am assuming is the hot wire?

I suppose that I could read voltage by touching the hot side of the switch and chassis.

It was getting dark and I could not see where the other one ended up. I will look again tonight.

bubenberg · Apr 21, 2005

Don't feel like the lone ranger, i am on my third one and a second thermostate including one melted battery top.

I will let you know where i found a less expensive fan, which lasted at least one year. The pt fan did not make it a whole season! Around 650 hours.