Author Topic: Blower motor help on 87 1500 305!  (Read 4506 times)

Offline michael.shelby.988

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Blower motor help on 87 1500 305!
« on: January 16, 2014, 05:35:43 PM »
Hello, I am new to this site and have a question relating to my blower motor... I striped my truck of the AC because it's winter and well it wasn't working in the Summer. I ha to replace my heater core due to a hole in it got it replaced as well as my AC stripped out...but now my blower motor will not work. I don't know if it's the relay or what I'm stumped.


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Offline Boone83K10

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Re: Blower motor help on 87 1500 305!
« Reply #1 on: January 16, 2014, 07:34:50 PM »
Did you remove the resistor on the ac box on the firewall?

 

1966 Mercury Comet - Built 429 (First Car/Show Car)
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1992 Chevrolet Lumina Euro (Sold @ 265,000 miles)
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Offline michael.shelby.988

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Re: Blower motor help on 87 1500 305!
« Reply #2 on: January 16, 2014, 07:36:08 PM »
No I didn't remove it. I have it plugged in from the relay? I'm stumped!


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Online bd

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Re: Blower motor help on 87 1500 305!
« Reply #3 on: January 16, 2014, 08:49:26 PM »
Hello Michael.

Is the blower motor plugged in and the ground wire connected?  Have you checked the fuses?  Did the harness connectors pull loose from the dashboard control?

What have you done so far to diagnose it?
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline michael.shelby.988

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Re: Blower motor help on 87 1500 305!
« Reply #4 on: January 16, 2014, 09:05:47 PM »
I've checked the fuse under the wheel (15a) it was fine the harness connectors didn't come loose I checked them. Ground wire is connected to a clean ground. The only thing I don't not understand is if the resistor does?! Like previously stated my whole AC unit is taken out of the truck


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Online bd

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Re: Blower motor help on 87 1500 305!
« Reply #5 on: January 16, 2014, 09:11:01 PM »
...The only thing I don't not understand is if the resistor does?!...

The resistor drops the voltage to the blower motor to control fan speed.  Do you have a test light?
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline michael.shelby.988

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Re: Blower motor help on 87 1500 305!
« Reply #6 on: January 16, 2014, 09:12:26 PM »
I do have a test light would I just check the two prong like things on the inside of that box? Or the plug it self?


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Online bd

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Re: Blower motor help on 87 1500 305!
« Reply #7 on: January 16, 2014, 09:23:35 PM »
Referring to "prong like things" is a little vague.  Begin by clipping your test light to a clean ground and probing the battery positive terminal to verify the test light and its ground connection.  Now, w/o moving the ground clip, turn the ignition on and probe the purple wire connecting to the blower motor - does the test light illuminate?
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline michael.shelby.988

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Re: Blower motor help on 87 1500 305!
« Reply #8 on: January 16, 2014, 09:30:45 PM »
I'll have to check on tomorrow it's 11 over here in the east coast. So say the test light illuminated then could it possible just be that my blower motor burnt out?


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Online bd

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Re: Blower motor help on 87 1500 305!
« Reply #9 on: January 16, 2014, 10:01:37 PM »
If the test light illuminates, then probe the bare metal of the blower motor's steel frame.  If the test light illuminates when probing the blower frame, the blower motor isn't properly grounded.

If the purple wire probes hot while it's connected to the blower motor and you've verified the blower frame is properly grounded, then run a temporary jumper from battery positive directly to the blower motor terminal.  If the blower still doesn't work, replace it.  Let us know what happens.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline michael.shelby.988

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Re: Blower motor help on 87 1500 305!
« Reply #10 on: January 17, 2014, 04:18:03 PM »
It was the ground! I tinkered with it cleaning the metal up and plugged it in and she started blowing! Thank you so much for your help bd!


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Online bd

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Re: Blower motor help on 87 1500 305!
« Reply #11 on: January 17, 2014, 08:39:43 PM »
You're quite welcome.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline christopher.lafollette

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Re: Blower motor help on 87 1500 305!
« Reply #12 on: January 25, 2014, 06:23:43 PM »
It was the ground! I tinkered with it cleaning the metal up and plugged it in and she started blowing! Thank you so much for your help bd!


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I had the same thing happen, my ground actually vibrated loose, I thought the motor was fried.