When engine is cold, remove radiator cap and checkcoolant level. If it is full, there is no air in system. If it is low, top it up, start engine with radiator cap off. Run engine for 5 minutes and top up if necessary.
Close radiator cap and run engine until fans comes on at least 2 times. Allow engine to cool and recheck coolant level.
The return hose being cold indicates coolant is not flowing. Did you check the hose to water passage for clogging?
Pull out the hose going to the heater core and use a water hose to connect to the heater core. If water comes out of the hose from engine, it is not clogged.
If uou had used air to blow through the heater core, it would not be accurate. Use a water hose to test. If the volume coming out is fast, then it is good. You can try back flushing the heater core. Apply the water hose to the return pipe from heater after taking off both hoses.
Wednesday, February 16th, 2011 AT 1:19 PM