The lack of heat is not normal. The heater-core flow control valve is located
right in front of the firewall and in-line with one of the heater-core hoses
that go through the firewall. It's a little black box in-line with one of the
hoses and has a cable attached to a little black lever. Be sure the lever goes
all the way to each stop when the temp control is at max low/high. This little
valve can also cause poor AC performance if it is not totally closed and
stopping the flow 100% when the temp control is on max low.