mazda 929 heater problems

my 1992 mazda 929 heater will not put out any more heat than about 60
degrees. the air works fine the fan blows lots of air it just won't heat
-up

"rickw" <(E-Mail Removed)> wrote in
news:(E-Mail Removed) lkaboutautos.com:

> my 1992 mazda 929 heater will not put out any more heat than about
> 60 degrees. the air works fine the fan blows lots of air it just
> won't heat -up

Is the thermostat working correctly? Is the heater core plugged?