Heater blows cold air, does not blow warm even at highest level.

[Vancouver808]

Thats good to hear. I doubt you are losing fluid. My ecoboost at 18000 miles was at the low level and ive been testing my oil. No coolant contamination. It was just at low level since factory.

Update:
I just drove truck around neighborhood to get up to temp. I turned heater on Hi and it blew nice and warm.
I then tried to lower heat temp to 85, 84, 83, etc…. As soon as I moved knob off the Hi level heat seemed to stop working until I put back on Hi again. Now I’m at a loss to what’s going on, I do have a service appt so I’ll let them figure it out.

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[Ozarkbeard]

Update:
I just drove truck around neighborhood to get up to temp. I turned heater on Hi and it blew nice and warm.
I then tried to lower heat temp to 85, 84, 83, etc…. As soon as I moved knob off the Hi level heat seemed to stop working until I put back on Hi again. Now I’m at a loss to what’s going on, I do have a service appt so I’ll let them figure it out.

So, it wasn't the coolant level. When engine is COLD, the coolant should be between the MIN & MAX marks on the reservoir.

 

[Vancouver808]

So, it wasn't the coolant level. When engine is COLD, the coolant should be between the MIN & MAX marks on the reservoir.

Correct, it wasn’t coolant level that was the issue. Took truck in for service last week, they found a bad switch for the heater. Apparently heater only working on Hi is default when switch goes bad. Now my heater is working perfect again.

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