AC fan blowing slower than ever

wcamarano · 09-27-2009, 07:53 AM

Just replaced altenator and then i lost dash lights and power to ac blower/fan controls after checking fuses and fusable links ,removed and reversed position of those 2 30 amp circuit breakers and now have power but,, highest fan level is like the lowest level before altenator switch,,,anyone have a clue what's wrong ????

Thanks

BernieB · 09-27-2009, 09:12 AM

Sounds like your new alternator is no good, or you didn't hook up the field wire. Did you buy new or a rebuild?

If you have a meter check and see what kind of voltage you have at the battery with the engine running. Should be between 12 and 14, with 13.8 being ideal.

wcamarano · 09-27-2009, 09:55 AM

Yea i did that already ,,got 13.7 running and 12.5 not running at battery,even went bought new breaker but does nothing...

crabtruck · 09-27-2009, 12:45 PM

Blower slow at hi-spd sounds like the batt voltage isn't getting there.
That could be caused by poor connections on ground side
just as easily as batt side. With the recent work, check those grounds.
May want to check voltage at blower itself and resistor for ref.
What truck is this ?

leolkfrm · 09-27-2009, 01:37 PM

what do you have with all the accesories on? should hold 13.6v or better then.
(lights,blower,defogger,etc)

gmctrucks · 09-28-2009, 08:07 AM

Now this has happen to me before I fix something and something else whet out maybe one of your speed relays under the dash messed up.

wcamarano · 10-17-2009, 07:26 AM

Quote:

Originally Posted by crabtruck

Blower slow at hi-spd sounds like the batt voltage isn't getting there.
That could be caused by poor connections on ground side
just as easily as batt side. With the recent work, check those grounds.
May want to check voltage at blower itself and resistor for ref.
What truck is this ?

It's a 1991 gmc 2500 extra cab longbed ...where would i check resistor and what should resistence be ? and where to check blower in eng.compartment ?

Ninja_Lawn_Guy · 10-17-2009, 07:46 AM

hahahahahaha

wcamarano · 10-17-2009, 08:20 AM

Quote:

Originally Posted by Ninja_Lawn_Guy

hahahahahaha

What the F**# ...Have you started drinking already !

Ninja_Lawn_Guy · 10-17-2009, 03:17 PM

chevy gmc heat ac blower issues...do I hear 6?

<---I was drinkin early...so busted

09-27-2009, 07:53 AM	#1
wcamarano Full Member Join Date: Feb 2009 Posts: 11	AC fan blowing slower than ever Just replaced altenator and then i lost dash lights and power to ac blower/fan controls after checking fuses and fusable links ,removed and reversed position of those 2 30 amp circuit breakers and now have power but,, highest fan level is like the lowest level before altenator switch,,,anyone have a clue what's wrong ???? Thanks

09-27-2009, 09:12 AM	#2
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 1,910	Sounds like your new alternator is no good, or you didn't hook up the field wire. Did you buy new or a rebuild? If you have a meter check and see what kind of voltage you have at the battery with the engine running. Should be between 12 and 14, with 13.8 being ideal. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

09-27-2009, 01:37 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	what do you have with all the accesories on? should hold 13.6v or better then. (lights,blower,defogger,etc) __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

10-17-2009, 03:17 PM	#10
Ninja_Lawn_Guy Senior Member Join Date: May 2008 Location: Michigan Posts: 413	chevy gmc heat ac blower issues...do I hear 6? <---I was drinkin early...so busted Last edited by Ninja_Lawn_Guy; 10-17-2009 at 04:27 PM.

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09-27-2009, 09:55 AM	#3
wcamarano Full Member Join Date: Feb 2009 Posts: 11	Yea i did that already ,,got 13.7 running and 12.5 not running at battery,even went bought new breaker but does nothing...

09-27-2009, 12:45 PM	#4
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Blower slow at hi-spd sounds like the batt voltage isn't getting there. That could be caused by poor connections on ground side just as easily as batt side. With the recent work, check those grounds. May want to check voltage at blower itself and resistor for ref. What truck is this ?

09-28-2009, 08:07 AM	#6
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,037	Now this has happen to me before I fix something and something else whet out maybe one of your speed relays under the dash messed up.

10-17-2009, 07:46 AM	#8
Ninja_Lawn_Guy Senior Member Join Date: May 2008 Location: Michigan Posts: 413	hahahahahaha

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