Heater Core Problems on 1989 90

[rlliss at rockwellcollins.com]

Help, it is cold out here in the midwest and my Heater Core looks like it
has bitten the dust.  Has anyone performed a corectamy lately.  How much
work is involved?  Is there an alternative until Spring?  I have tried the
Prestone Flush with no results.  I have also noted that my temp sensor in
the dash is no longer reading temp since I flushed it - can the flush have
affected the sensor?  Nearly Frostbitten...

Ray Liss
'89 90Q