find a good leather conditioner.i think the one i have is from eagle one but regardless it says to apply WITH FINGERS.make sure leather is clean first and then work conditioner into leather fully.i think the leather will be fine from the heaters as long as you take care of it

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)