Dan, I wouldn't put the rear one in the front.  They are known for
leaking while the front ones have lasted over 20 years without ever
leaking.  Everything wears out over time but I think that is a pretty
awesome track record.  We have new front cores for $199.  Cheap
insurance against never having to do this job again.  We also have the
front blower motors in stock for $125.  Again these are OE so as long as
you can keep the mice out you should be good for another 15 years.  Let
me know if I can help you.

Ken Wilford
John 3:16
www.vanagain.com

Dan Barrett wrote:
> All:
>   This raises a question which I've been pondering since last winter, when
> the rear heater alone saved my bacon -- in a blinding snowstorm, my
> radiator clogged and the temp gauge spiked.  I cranked the rear heater
> (my front heater blower is dead), the engine temp went down to
> acceptable levels, and I made it to my destination not long thereafter.
>
>   This year, I'm thinking about finally doing the dreaded front heater
> blower / heater core dashboard massacre, but given the output of the
> rear heater core and the cost of a new front heater core, has anyone
> ever tried putting a rear core into the front heater box?  I realize it
> would take some modification to get the rear heater core mounted in
> there, but do I recall correctly that the black plastic portion on the
> core which mates to the heater control valve is the same on both cores?
>
>   Apologies if this has been asked and answered before.
>
> Best,
> d.
> 1990 GL -- "Mudskipper"
>
>