Thank you for the suggestions, i would not put anymore on the motor, these things run great as is, i was thinking good insulation for the firewall, back and doors, and raptor lining the floors in the case of a small water crossing and getting water on the floors. Electric heat would have to come from a rear mounted battery bank powering other accessories as well. For now these are just ideas, i understand that a good heater core replacement should do the trick. Thanks again for the info and advice. Lets keep these jeeps on the road and be creative [emoji41] 88’ Renix Manual 2wd Sportruck