You won't have to drain more than a pint or two from the heater core if you connect the two hoses together or just keep the ends of the hoses elevated above the radiator.

If you have this style of heater, you will have to remove the entire unit to replace the motor.

The pictures I took when I replaced the heater core show that the motor comes out the firewall side of the unit. The fan has to be removed before the motor can come out.
Attachments
IMG_20211006_174421.jpg (69.5 KB, 135 downloads)
IMG_20211006_175037.jpg (68.87 KB, 135 downloads)
IMG_20211006_174432.jpg (65.89 KB, 134 downloads)
IMG_20211006_165934_1CS.jpg (99.18 KB, 128 downloads)
IMG_20211006_180725.jpg (59.74 KB, 129 downloads)

Last edited by Otto Skorzeny; 10/13/2022 2:38 AM.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)