Yes I have only engine coolant heater, no ac!
It is installed under the steps into the cabin, the switch is at the helm!
I think it was installed as part of the Cruising package! Not sure about that though! Will ck my documentaion when I can get in the boat! ( been laid up with the flu and am still not getting around to much).
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)