Heated Mirror Not Working

I recently noticed the right (passenger) outside mirror doesn't defrost anymore. The mirror still moves when I back up. Any ideas on what the problem is? The truck is a 2004 Sierra SLT ext.cab. I love all of the
electronic features of the truck but dread having repair bills from the dealer. That's about the only place that can fix some of these problems.
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Ann Meffert wrote:

I've had 3 burned out heated mirrors on my 2000 Z-71 LT 5.3 Silverado...
First two covered by the 3 year GM basic Warranty. Years 2 and 3.
Third one burned out in Year 5 and dealer says is not covered by the $2000 GMPP Warranty in years 4 thru 6..... I'm half happy.... My GMPP warranty ends Easter of 2007.....
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Dennis Mayer wrote:

Update: My GMPP Warranty ends Easter of 2006........
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Well, that's not good news. I need to get an extended plan quick. I'm thinking of going with a non-GM plan since they want the most money of any I've reviewed so far. Would you buy the GMPP again?

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Ann Meffert wrote:

Since GM trucks have a 7 or 8 year 'chassis production run',
I'd buy a GMPP extended warranty for a model that is year 1 or year 2
of the 'design cycle'. For a 99 or 00 Silverado yes.....
For a 2007 or 2008 Tahoe yes.... The GMPP Extended Warranty runs
for ownership years 4 thru 6...... I call this long term
insurance against expenses related to possible design or production flaws....
You might win some and lose some, but my repair expenses over 6
years should should never be major... Ya, I did pay $2000 up front.

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Apparently not hard to fix - the part is about $70.00 from the dealer. I have the same problem on my 01' Silverado 2500HD
What the dealer told me (use at your own risk):
* WEAR SAFTEY GLASSES/GOGGLES - these things tend to shatter when removed * Pry off the mirror, just snaps in * Disconnect the wire from the old mirror * Reconnect to the the new one - use Dielectric Grease * Snap back in
Might want to check it with a volt meter before putting it back together to make sure it's not something else.
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