[jrstoy]

can you guys help 98 d 5.9 it has very little heat new tstat 185 new fan clutch // the d just cant get warm inside .. thanks for the input in advance

 

[RobMR3]

Turn on the A/C. If you feel air, then it's not a airvent problem. You aren't smelling coolant are you. I don't know where the heater core is placed on our trucks, but if it's easy to get to, feel it. I might have a block somwhere in the system.

 

[jrstoy]

AC WORKS FINE BUT NO HEAT NO SIGN OF LEAKING