#1  
Old 07-24-2022, 11:33 AM
Ramairnacho Ramairnacho is offline
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Default My rear blower motor

My car is basically stock as my dad had it. I believe this is a stock rear 1970 blower motor and hope it still works its all complete. I m ordering a new m and h wire harness for the car and want to swap it out. This blower motor has not been on in over 35 years ,hope it works. Anyone know what years are compatible if it doesn't. So far on my quest to find a 904 I gathered 2 902, 2 903, 2 blanks, 2 928. And 1 903 repop. I also gathered all the correct fans and pullies to make one with a blank, but if I find one out there I might nab it up. So that's the rear defogg unit that required the 904 with ac. The switch is located on dash next to cigarette lighter and that is complete too, also have the plate. My dash board is toast and I hope to.buy one from.a new friend as a good core or if one is out there. Im.getting close to have all my number matching stuff. Then slowly getting stuff rebuilt.
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Last edited by Ramairnacho; 07-24-2022 at 12:32 PM.
  #2  
Old 07-24-2022, 12:32 PM
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as for the fan motor, why not have the original rebuilt?

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  #3  
Old 07-24-2022, 12:59 PM
Ramairnacho Ramairnacho is offline
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Yes that's rear blower fan. Who rebuilds it if it doesn't work?

  #4  
Old 07-24-2022, 01:48 PM
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You don't have the electric grid defog, so your alternator should be the 1100903.

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Old 07-24-2022, 03:40 PM
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Quote:
Originally Posted by Ramairnacho View Post
Yes that's rear blower fan. Who rebuilds it if it doesn't work?

This one is in Hemmings




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  #6  
Old 07-24-2022, 04:14 PM
Ramairnacho Ramairnacho is offline
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Default Electronic grid

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Originally Posted by Held for Ransom View Post
You don't have the electric grid defog, so your alternator should be the 1100903.
Ranson,
Did they have electric grid in 1970? I read charts my friends give me and was unaware of both blower and electric. This in interesting now!

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Old 07-24-2022, 04:24 PM
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Quote:
Originally Posted by Ramairnacho View Post
Ranson,
Did they have electric grid in 1970? I read charts my friends give me and was unaware of both blower and electric. This in interesting now!
Great web site, hats off to who owns this!

link

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Old 07-24-2022, 04:54 PM
Ramairnacho Ramairnacho is offline
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Default Info

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Originally Posted by DavesGTO View Post
This one is in Hemmings




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I thank you for helping me get Info on rebuilding the co.ponents to my dads old car which is my first car.

  #9  
Old 07-24-2022, 06:30 PM
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I am betting that motor works.
As its an option, it had its own harness.

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  #10  
Old 07-24-2022, 06:56 PM
Ramairnacho Ramairnacho is offline
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Default Defogg and ac

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Originally Posted by Held for Ransom View Post
You don't have the electric grid defog, so your alternator should be the 1100903.
I have ac too, is it still 903 or 904. Oh this is confusing lol

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Old 07-24-2022, 08:15 PM
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A buddy has a 1970 factory set up, its all original, its a 903. AC and the rear blower. The 71 and up could change things as they didn't make a high amp 10si till later in the 70's.

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  #12  
Old 07-24-2022, 09:21 PM
Ramairnacho Ramairnacho is offline
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Default Blower and ac

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Originally Posted by Formulabruce View Post
A buddy has a 1970 factory set up, its all original, its a 903. AC and the rear blower. The 71 and up could change things as they didn't make a high amp 10si till later in the 70's.
This is very interesting since I seen charts for a 904 with both options and do you know if 70 had electric grid defogg I never see. One for 70

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Old 07-24-2022, 09:23 PM
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The blower motor will probably draw 10-15A on start up and drop to 5-7A to run. An electric grid will draw a lot for longer periods requiring a more stout alternator. '71 they realized they needed to go to the larger 12SI alternator.

Either defogs were an option. Option 341 is the 6 cylinder engine.
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Last edited by Held for Ransom; 07-24-2022 at 09:29 PM.
  #14  
Old 07-24-2022, 10:14 PM
Ramairnacho Ramairnacho is offline
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Default Rear defogg

Quote:
Originally Posted by Held for Ransom View Post
The blower motor will probably draw 10-15A on start up and drop to 5-7A to run. An electric grid will draw a lot for longer periods requiring a more stout alternator. '71 they realized they needed to go to the larger 12SI alternator.

Either defogs were an option. Option 341 is the 6 cylinder engine.
Thank you for helping me figure that out so it is a 903 not a 904 great news. I been studying and looking for 904 for 8 months and it's the wrong one . So embarrassing.


Last edited by Ramairnacho; 07-24-2022 at 10:19 PM.
  #15  
Old 07-24-2022, 10:36 PM
Ramairnacho Ramairnacho is offline
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Default Defroster

Quote:
Originally Posted by Held for Ransom View Post
The blower motor will probably draw 10-15A on start up and drop to 5-7A to run. An electric grid will draw a lot for longer periods requiring a more stout alternator. '71 they realized they needed to go to the larger 12SI alternator.

Either defogs were an option. Option 341 is the 6 cylinder engine.
If I understand this correctly the defrost unit wasn't available in a 6 cylinder. Is that correct? I never seen that option probably popular in Canada I think. Im.no.expert and thank you for teaching me.


Last edited by Ramairnacho; 07-24-2022 at 10:58 PM.
  #16  
Old 07-25-2022, 04:35 PM
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Quote:
Originally Posted by Held for Ransom View Post
The blower motor will probably draw 10-15A on start up and drop to 5-7A to run. An electric grid will draw a lot for longer periods requiring a more stout alternator. '71 they realized they needed to go to the larger 12SI alternator.

Either defogs were an option. Option 341 is the 6 cylinder engine.
The '71-75 ( possible 76) Large 80 amp Fixed in place Alternator use with hi amp options
is a >> type 27Si <<
The type 12Si is a newer upgrade of the 10si, and has same size and plastic fan in front.
Just trying to keep the facts right, no offense ..
I agree, the Grid types draw More current for longer periods. I have Never seen a 1970 with the rear window grid system.

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Last edited by Formulabruce; 07-25-2022 at 04:42 PM.
  #17  
Old 07-25-2022, 05:38 PM
Ramairnacho Ramairnacho is offline
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Default Rear defrost

Quote:
Originally Posted by Formulabruce View Post
The '71-75 ( possible 76) Large 80 amp Fixed in place Alternator use with hi amp options
is a >> type 27Si <<
The type 12Si is a newer upgrade of the 10si, and has same size and plastic fan in front.
Just trying to keep the facts right, no offense ..
I agree, the Grid types draw More current for longer periods. I have Never seen a 1970 with the rear window grid system.
Well me either I got the blow wet motor and it would be nice to see and also thank you guys for helping me get a lid on what alternator I need and I believe I have a few . Bit yes would be nice to see this grid style defroster,I'm thinking a car in a cold area and we all know what happens to cars in cold states.

  #18  
Old 07-25-2022, 07:10 PM
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I looked into it more.
So, even though the electric grid option was offered, none were installed on the '70 Firebird series. 1640 were installed in '71s and 1862 were installed in '72s.
The blower defog was installed in 3097 '70, 2697 '71 and 1787 '72 Firebird series.

Yes, 27SI is what I was thinking, not 12SI. Thanks for the correction Bruce.

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Old 07-25-2022, 07:37 PM
Ramairnacho Ramairnacho is offline
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Default Grid defroster

Quote:
Originally Posted by Held for Ransom View Post
I looked into it more.
So, even though the electric grid option was offered, none were installed on the '70 Firebird series. 1640 were installed in '71s and 1862 were installed in '72s.
The blower defog was installed in 3097 '70, 2697 '71 and 1787 '72 Firebird series.

Yes, 27SI is what I was thinking, not 12SI. Thanks for the correction Bruce.
Held for Ransom,
Is the 27si alternator the 80 amp one? The phs docs say the 904 is a heavy duty alternator but people say they have seen them. 🤔 is the 904 same housing as 903 and 902 or does it require special brackets and if no.back.grids where ever installed was this alternator even on a car?Wallace racing says 904 used with ac and defogger. Well im.happy with a 903 or a blank.but im.curious. thanks

  #20  
Old 07-26-2022, 04:09 PM
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Quote:
Originally Posted by Held for Ransom View Post
I looked into it more.
So, even though the electric grid option was offered, none were installed on the '70 Firebird series. 1640 were installed in '71s and 1862 were installed in '72s.
The blower defog was installed in 3097 '70, 2697 '71 and 1787 '72 Firebird series.
neat!

How were you able to access that information?

I have a complete setup from one of those 3,097 cars sitting in my garage loft (ok, the switch isn't in my loft, it's in a parts organizer with other similar switches).

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