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Old 02-05-2018, 02:30 PM   #1
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Dash Heater Blowing Cold Air

FR3 DS30 2015. Why would my dash Heater and defroster be blowing cold air when it's maxed out in red?
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Old 02-05-2018, 02:58 PM   #2
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Could be your thermostat... 20 bucks to replace it
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Old 02-05-2018, 03:48 PM   #3
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Should check control

There is a vacuum control out side on upper fire wall. Make sure the water lines upper and lower are hot, could be vacuum door is not opening. If water line is cool than might be a Engine thermostat , oh and could be electrical.
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Old 02-05-2018, 04:01 PM   #4
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It's a Ford....the problem is circled in blue!

My 2011 F150 had this exact issue. Driving along with cool air blowing, turned it to warmer air and it didn't change. It turned out that the temperature control knob controlled a HVAC Heater Blend Air Door Actuator. This part was the motor that pivoted a door between the hot and cold air vents that enter the HVAC system.

Not super easy to get to (have to get into the dashboard) but it's a relatively inexpensive part (mine was $23) that takes 2 bolts and an electrical connection to swap out.
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Old 02-07-2018, 08:37 AM   #5
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Ours never really blew hot air in our opinion, but I checked the heater pipes and both the intake/exit plumbing was hot. This past trip, we installed roughly 2" cardboard cutouts to cover all the grill openings and that made the world of difference. We used it with temps up to 25-30F with never an issue. Give that a try first.
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Old 02-07-2018, 09:16 AM   #6
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Quote:
Originally Posted by KansasFR3 View Post
Ours never really blew hot air in our opinion, but I checked the heater pipes and both the intake/exit plumbing was hot. This past trip, we installed roughly 2" cardboard cutouts to cover all the grill openings and that made the world of difference. We used it with temps up to 25-30F with never an issue. Give that a try first.
How did you attach the cardboard cutouts to the grill openings?
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Old 02-07-2018, 09:23 AM   #7
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They were just pressed fit. I don't know if you've installed a bug screen on the back side of your grill, but that prevents it from falling into the engine compartment. Works good enough. Spray paint it black if you want to pretty it up. :-)
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Old 02-07-2018, 09:31 AM   #8
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first thing I would check is the antifreeze level. When the level is too low the first thing to not work properly is the heater. Of course any of the things already mentioned may also be the problem, but start with the simple stuff first.
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Old 02-07-2018, 09:34 AM   #9
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first thing I would check is the antifreeze level. When the level is too low the first thing to not work properly is the heater. Of course any of the things already mentioned may also be the problem, but start with the simple stuff first.
Good point
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Old 02-27-2018, 03:22 AM   #10
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Did this get resolved ? I'd love to know the why
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