[DeTomaso] cooling fan blowing fuse

[Brian Hill]

Thanks Doug, Orville, and J.  Looks like I have some work ahead of me.  Oh well, 
weather is getting cooler so it will be more fun to work on.  J mentioned some 
relays that might also be damaged due to the way they are mounted on the car.   
I am aware of the cooling fan relays under the dash on the passenger side.   Are 
there others mounted in the front?

Best regards,
Brian






________________________________
From: Brian Hill <mazdastuff at yahoo.com>
To: SCPOCA at yahoogroups.com; detomaso at realbig.com
Sent: Sun, October 31, 2010 3:57:37 PM
Subject: Re: [DeTomaso] cooling fan blowing fuse

Okay, performed the test with a 15 fuse inline to the power source.  performed 
separate test on each fan and fuse did not blow. (tried it multiple times)  I 
cleaned the terminals with an electrical cleaner and plugged everything back 
together as normal.  For grins, I tried the manual switch with the key to the On 

position...hit the switch, no problems.   On/off, On/off...did not blow.  Before 

you could just hit the switch and it would pop.  


Next step, took car out for quick run to get temps up.  Temps got up, pulled 
over to verify that Temp Controlled fan was running.  Hit the Manual fan switch 
and the fuse blew.

So, what I learned is that both fans cannot be running at the sametime.  But 
unfortunately, that is all I learned.  The fans had been running just fine until 

recently so something has changed.  


Feel free to chime in.

thanks,
Brian
01642







________________________________
From: doug351c <doug351c at gmail.com>
To: Brian Hill <mazdastuff at yahoo.com>; SCPOCA at yahoogroups.com; 
detomaso at realbig.com
Sent: Sat, October 30, 2010 8:04:57 PM
Subject: RE: [DeTomaso] cooling fan blowing fuse

Brian,

What amp rating fuse are you using?  And how fast is it blowing?  My info
shows it should be a 15A for fuse #11 on a 1971.  Since you have no trouble
using fuse 11 and its relay to drive the other fan, that says that that
portion of the wiring is OK.  To see if the motor is drawing too much
current, directly connect the fan to the battery through a 15A fuse.  Be
sure to connect both the hot and the ground wire in this test or the fan
won't run.  If the fuse blows, try a 20A fuse.  If the 20A fuse doesn't
blow, the Pantera's fan wiring is good for using a 20A fuse so go ahead an
use it.  If the 20A fuse blows, get a new fan motor.

Doug Braun
blue 73L #5505

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Brian Hill
Sent: Saturday, October 30, 2010 4:00 PM
To: SCPOCA at yahoogroups.com; detomaso at realbig.com
Subject: [DeTomaso] cooling fan blowing fuse


I have a 71 model early.  Has manual cooling fan switch.  Recently I hit the
switch and fuse #11 blows disabling the manual fan.  I tried checking the
fan
operation by using some jumper wires (recommended by Dave Bell) and the fan
runs
like a champ.  does not bind or spin slowly.  So I tried switching fans,
plugged
in the other fan to the harness for the manual and I hit the switch.....fuse
did
not blow.  Tried it multiple times and it works fine.


Question:  is the fan simply drawing too many amps thus blowing the fuse but
still operational?


Brian
01642


      
_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso