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        General >> Problems >> Heater Blower Slow after fan repair (Solved)
        
(Message started by: Terje on Feb 15^th, 2007, 9:17pm)

Title: Heater Blower Slow after fan repair (Solved)
Post by Terje on Feb 15^th, 2007, 9:17pm

1995 Scorpio Classic DOCH 2.0 (No AC)

Hi, I have a problem with the Heater fan.
I have recently fixed the heater fan following this guide: http://www.fordscorpio.co.uk/fanrepair.htm (HBC Fanrepair) When cleaning the heater fan i found one of the "Electric brushes" (don't know the english word) beeing worned out, i went to my local hardware store, bought a new "brush" fitted it and put everything back.

Now the heater fan runs, but it runs really slow, it runs at different speeds on I II III but very slowly.
Here is the wierd thing tough, If I drive in a right turn the fan starts running faster. I even tested driving in right turn circles for a while and it runned faster, not at top speed but atleast a little bit faster.

Any ideas?

UPDATE:
I for the fun of it decided to simply try to disconnect/reconnect the multiplugs attached to the Thermal Fuse, I noticed a slight difference where as the fan speed increesed slightly. I then disconnected the multiplugs took a sharp nail and cleaned the connectors, and made the gap in the connectors much smaller, then connected them again and started the heating fan. The fan speed has now increesed by 20% so im pretty happy about that, but i would say that the heating fan isnt running at more than 60% of it's normal speed.
So any ideas of what to try next would be really apprishiated.

Title: Re: Heater Blower Slow after fan repair
Post by harry.m1byt on Feb 15^th, 2007, 10:55pm

Brush is the correct word.

Usually if a brush is seriously worn down before it is noticed, the commutator (the copper segmented thing the brush makes contact with) has suffered damage. Just simply putting a new pair of brushes in can often make the commutor damage worse resulting is a poorly running motor.

The rather strange part is the variation in speed with a right turn - could it indicate a poor conenction somewhere? Have you tried putting a direct 12v feed to the motor, to eliminate external to the motor problems?

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by Terje on Feb 15^th, 2007, 11:02pm

Yes, i forgot about that. After replacing the brush I tried the fan connected directly to my car battery and the speed was really fast..

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by harry.m1byt on Feb 15^th, 2007, 11:56pm

The problem then is obviously the speed control or its connections. I think this is just a resistor on this car and it suffered poor connections

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by Terje on Feb 16^th, 2007, 7:24am

on 02/15/07 at 23:56:05, harry.m1byt wrote:

The problem then is obviously the speed control or its connections. I think this is just a resistor on this car and it suffered poor connections

The speed switch has been replaced, possibly you are correct about it's connections, it's hard to locate the problem really

Anyway, might it be that the Electrical Brush i bought and replaced with is to high or not correctly fitted ? could that affect the speed?

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by Simmo on Feb 16^th, 2007, 8:00am

Have a read of THIS (http://www.fordscorpio.co.uk/acthermalfuse.htm) article and see if that helps. If the device shown is fitted to your car it may have been disturbed during the repair.

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by Terje on Feb 16^th, 2007, 11:43am

on 02/16/07 at 08:00:34, Simmo wrote:

Have a read of THIS (http://www.fordscorpio.co.uk/acthermalfuse.htm) article and see if that helps. If the device shown is fitted to your car it may have been disturbed during the repair.

I have read it allready, Im not sure this is the problem i'm having since the fan works at all speeds with adjusted speed by the switch. I have a feeling it's more like the wireing are "loosing power" somewhere and that there is not "full power" at the multiplug end.

That's why the fan spins faster in right hand turns, the connection to the Thermal Fuse get's better/more voltage and the fan speed increses

Update: I just connected live wires from the battery directly to the thermal fuse connectors, i put the Positive on all the different connectors for the multiplug (on thermal fuse) and the fan runned at all speeds, At top speed it finally runned as normal (FAST) .. Now i reconnected the multiplug, put the ignition on and started the fan, back to about 60% of normal speed on full.
Is it the relay ? the big green one that is faulty or simply bad connection somewhere ?
Can anyone think of where, or possibly think of a workaround ?

Title: Re: Heater Blower Slow after fan repair (Updated)
Post by Terje on Feb 16^th, 2007, 4:01pm

Ok, I think i've solved it with Simmo's help, The Thermal Fuse had endeed been disturbed during the repair of the heater motor. The resistor wires where pushed out of original position, to close to each other and other things.
I corrected the thermal fuse resistors, Sprayed alot of WD40 down to the motor from where the thermal fuse where located, sprayed the multiplug connectors with wd4 and finally replaced the big green relay with anotherone just for testing.

Mounted everything back, started up the car and zam... the fan runned at full speed, atleast for a while, then dropped a little.

I'm going to take out the blower motor tomorrow and clean it properly with wd40

Title: Re: Heater Blower Slow after fan repair (Solved)
Post by harry.m1byt on Feb 16^th, 2007, 6:07pm

Keep the WD40 well away from the brushes and commutator.