You need coolant to absorb the heat (think low coolant)
You need heated coolant (think 195 degrees)
You need coolant flow (unrestricted) verify theirs no restriction) restrictions do happen in the heater hose connector/connections
Coolant needs to have good flow and pressure ( unhook the inlet and check for a good flow,,, gotta keep the rad full while checking)
If alls good feel both the inlet and outlet hose they both should B very hot,,, if one side is hot and the other cold are warm you have a restricted heater core...
Common to a restricted core,,, shut the engine off and wait 3 to 5 min. start the engine up,,, if you have good heat for the first 30 to 60 sec. then tappers off the core is restricted.... you can test by feel of the air
If both are very hot and feel the same you have a air flow problem in the case.
Good heat is when the heater blows 140/145 degree air HI blower speed ,,, anything below that is not consider good heat... are not tolerable in most cases.
This post was edited by Hobo,NC at 17:46:13 11/26/10.
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