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Removing the dash is the long way....
Check the archives here - I have replaced 3 blower fans and the last 2 were the easiest.
Don Foster had the best method, involving a "Dremel" type rotary cutting saw.
Cut the ends off of the fan housings, making one large index notch so that it will go back in in the same position.
Leave as much of the outer rim but cut it large enough to remove the fans.
Before you totally cut the end plates free, drill 3 pair of approximately 1/8" dia. holes set equally around the circumference. This is for attaching the end plates later.
Once the ends are off - removing the fansm and then the motor is easier than trying to dis-assemble the housing and working through the dash or removing the dash.
Also - I have noticed that once I removed and replaced the dash - no matter how careful I was - the dash cracked like crazy afterwards.
When it comes to re-assembling the housing - use three small nylon zap-straps to hold the end plate in place - you can snug it very well this way. Then seal the cut line with silicone using a tube or a silcone/caulking gun. The tube is a bit easier to get in under the dash.
The silicone lasts forever and does not dry out and come loose like duct tape.
Good luck.
This is the short version - there are more detailed directions in the archives that address the wiring and a few other nigglies
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