heat could be warmer!

check out your coolant-- how nasty is it-- could be the heater core is clogged with bar's leak-- could be a "t" stat that is too cold-- many issues.

how hot does your heater hoses get?

an after market gauge will assist, will give you temp of coolant circulating.

start simple, check coolant cleanliness, T stat temp, radiator cap, is collant circulating-- then go from there.

Lawrence