[fireplow]

Hey I had the same trouble with a 95 I found a vac line under the dash that was loose (i think it was gray) hook it back up the damper and the heat worked great. No there is no valve in the heater line. Now there maybe a pluged line. Allow the motor to come up to temp. and feel the heater lines if both fell hot then no plug. Now if one fells hotter than the other then pluged line. Flush the line and see what happens. I hop this helps.