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Unread 10-08-2013, 06:31 PM   #1
BIGHORN66
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1991 YJ Wrangler 
 
Join Date: Sep 2013
Location: BRAZIL, IN
Posts: 8
Blazer blower motor upgrade

Alright, newbie question here, what is a "Blazer blower motor upgrade"??
Can it be done on a 91?
What all is involved?
Anybody got a write up on it?

Thanks.

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Unread 10-08-2013, 06:51 PM   #2
timatoe
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1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley California
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It was an upgrade to the heater fan. I forget exactly which year they started putting the new fans in YJ's but they are bigger diameter and will require you cut the hole in the firewall bigger. Siemens PM-102 is the replacement fan for YJ's. All replacement fans are the large diameter fan now. There has been debate over whether the Blazer fan is PM-102 or PM-105 recently, but when I first started researching it the Blazer fan was PM-102 and so is the current YJ replacement.

http://www.jeepforum.com/forum/f12/b...oundup-503604/


This has really good info on getting to it...... Take a look at post #101 there too......
http://www.jeepforum.com/forum/f12/heater-core-219329/
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Unread 10-09-2013, 07:16 AM   #3
kenh
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1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: Billings, MT
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I just changed my heater core & blower motor this last weekend. I used the PM-102 and it works great, just had to make the hole in the firewall bigger. I 'think' you may not even have to do that in a '91, but I'm not positive. That being said, there are multiple write ups in the FAQ for the blower motor and heater core, which basically involve the same steps:
http://www.jeepforum.com/forum/f12/y...-first-580536/
Go to the "Heating and A/C" section.
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Unread 10-09-2013, 07:37 AM   #4
GrantYJ
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1992 YJ Wrangler 
 
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Location: Neosho, Missouri
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When I did my '92, I had to trim. The difference in airflow is amazing.
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Unread 10-09-2013, 08:26 AM   #5
kenh
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The difference is pretty amazing.

Also, just to relate my experience since I just got done with it - in one of those write ups the guy says it only took him a couple hours working at a leisurely pace... it probably took me 8 hours between two days. Part of that I'm sure is that I'm a noob when it comes to a lot of this stuff, but I also ran into multiple issues
- radiator apparently not having a petcock valve, so I got fluid everywhere when I drained it by disconnecting the lower hose. I did have a bin underneath to collect the fluid, but removing the hose didn't go smoothly as I had imagined.
- needing to replace hoses that had been basically baked to the old heater core over time, and trying to find the replacements
- not having all the tools I needed before hand (I had a big enough hole saw for the new hole, but needed a smaller one to cut a wood circle to use as a guide inside the old hole while I cut the new one)
- trying to figure how to get to the clip between the housing and the body to get it disconnected, that damn thing took me forever.
- Also, having a second person helps quite a bit when re-installing the housing.

So just be prepared to have your jeep possibly out of commission for a little while.
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Unread 10-09-2013, 01:40 PM   #6
BIGHORN66
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Thanks for all the replies !!!
You guys are great.
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