Heat not blowing hot air after 10 min of idle
 

I have been noticing that if my truck idles for more than 8 min or so it starts blowing cool air. Once i step on the throttle it gets hot. Is that normal? Is something sticking? It has been about 20 degrees here and a little colder at night. Come out and expect a nice warm truck and its not that warm. The temp gauge shows it at running temp. Any ideas or suggestions would be great!

Low on coolant, when you put coolant in always make sure the heat is on. Also check the little vacuum line that goes to the heat valve, it will be just behind the alternator on the 3/4 heater hose, the vacuum line gets knocked off all the time if you are putting your hand anywere near the turbo, the line will also be pretty close to the oil fill tube.

I will check both of those things!! thanks for the quick reply. What is the best kind of coolant to add?

You don't want to mix coolants, it can create a gooy slime. If it is factory coolant then it should be Ford Gold.

I am having the same problem, currently looking into head gasket issue, hope not the case, i am going to check my valve too thanks!


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I checked my valve and it was all good. I also added coolant and changed out my radiator cap since they are prone to failure. Next i was goin to try putting a piece of cardboard in front of radiator and see what happens. Let me know your findings as well.

How cold is it where yall are at? These trucks require alot of coolant and and takes along time for that coolant to warm up.

it has been anywhere from 10 to 20 degrees for the last couple weeks. Its funny cause the temp gauge shows its at running temp

You know, a stuck open or busted thermostat will cause this also, that is a 10 minute check, might as well look into it.

Mine shows it's up to temp too, no heat until I drive it, but I also know there is no coolant in the bottle either, it's low and I'm not planning on adding any until the cab comes up soon. :c: