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My 2006 f-150 4.2L 113,000 miles heater blows cool when at Idle ,But when driving the heater blows hot. Change thermostat change water pump change the Rad. change the blend door motor
flush the block bleed the system add new green coolant. After all that still blowing cool air at Idle. What is causing this problem.
i believe the question was explained as fans work!! why all the fan inop answers?? anyway...you will need to check the water pump first...if you change it then make sure your cataltic converters are not plugged. from there its ussually a combustion leak from cracked or defective head gaskets due to the mileage. if it stays cool at idle its deff not a cooling fan problem..the fans only are used primary at idle. hope this helps
Check to see if your electric radiator fan comes on when you are idling. You would be able to hear it if you open the hood. It should come on at around 200F and go off at 160-170F. If it is not working the car would heat to hot, when you are driving the air is forced thru the rad cooling off the antifreeze.
You say the pressures are good?The low side on this vehicle need to be lower than most,because it has a expansion valve,it needs to be around 30 psi,to about 35,if it is not,and the freon level is correct,then the expansion valve is bad.If this was helpful,please rate,thank you.
Cooling System Mix
Coolant level low or flow is restricted.
Thermostat stuck closed
Heater Control Valve
Leaking or defective heater control valve.
here something to help u
the a/c condenser has a fan in front ( there is actually 2 fans if you sit on the car it will be fan on right side ) if this fan does not
come on immediately when you are parked and engine in idle
there is a problem with power to it, or motor failure. If you drive it
on the highway and a/c operates fine that's because air is circulating though condenser (thats what the fan is supposed to do at idle or slow traffic)