Is it just me or is there no way to have the hvac recirculate with the heater on. There is no recirc button and if I go to max a/c it seems to command the blend door to cold. It fine for now. It's only gotten to -10 but when it gets closer to -30 I don't know if it will suffice. I have an 03 expedition xlt
recirc heater?
- Thread starter metaldrgn
- Start date
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Copper93
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There is no way to turn on recir on heat. It only turns on with a/c max.
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metaldrgn
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So it's randomly goes cold in something else than max ac? I haven't had that issue. Sometimes I have to cycle the switch to get it out of the hottest setting. At least I've got other vehicles if it doesn't stay warm enough.
AcesOverEights
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its a timed circuit, just like the rear defrost or your seat heaters.
its not "supposed" to be on all the time, but it sure would be nice if it did. my 05 f150 could stay on all the time. that was like a blast furnace inside the cab. It was great.
its not "supposed" to be on all the time, but it sure would be nice if it did. my 05 f150 could stay on all the time. that was like a blast furnace inside the cab. It was great.
ExpeditionAndy
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I tried it on my '05 EB Expedition with Auto A/C and it allows me to recirculate. I didn't wait to see how long it will stay on though.
splintrcel
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if your heat is getting crappy its an issue with your coolant system. Whether its dirty coolant, thermostat, or bad heater core. I just replaced my heater core in the front and my truck blasts heat now. It was a pain in the ass to do but after not freezing to death during 4 F weather in wisconsin, i am totally ok with it. I can wear a tshirt in my truck now once its up to temp. If everything is working correctly you shouldnt need to recirculate the air. If you have the EATC module its pretty good at keeping you comfortable. Max AC does work on heat and will recirculate air but i dont think it will make your truck much warmer. The Expy has a lot of windows to lose heat out of and if you lack a rear heater core, it takes a lot of heat out of the front to fill the large space in the back.
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metaldrgn
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No the heater is working great, but it will only work so well not recirculating the air. When it's pulling in -14 degree F air constantly, it can only heat it up so much. Like I said it's getting borderline. I have my blower and heat setting maxed out. When you recirculate the air, you are rewarming the air in the cabin and yes it makes it hotter because the outside air is colder than in the cabin and will heat up till it almost reaches the temp of the coolant flowing through the heater, but lose heat also, like you mentioned, through the windows and everywhere else that connects to the outside. I do lack the EATC and rear heater and it still heats up the entire car, but recirc would be better. I will probably sell this is a little while and possibly upgrade to an EB model with all the bells and whistles.
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It will also shut off the recirculation when I switch to different vent positions. My friend has an 03 EB and his doesn't do that.
stamp11127
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From the Ford Service Manual:
"Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes."
"When MAX A/C is selected:
The air inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.
The panel/defrost door is at full vacuum and the floor/panel door is in the no vacuum position, directing airflow to the instrument panel A/C register (19893).
The temperature is usually set for maximum cold but may be heated if desired.
Air will be picked up at the recirc opening by the blower motor (18527). Within the A/C control set for maximum cold, airflow across the A/C evaporator core (19860) will be diverted past the heater core (18476) and then directed into the passenger compartment through the instrument panel A/C register. There is also some airflow to the AC side window demisters.
The A/C compressor (19703) will be enabled when MAX A/C is selected.
The blower motor is on. "
Easiest thing to do would be put a cut off switch on the a/c compressor so that you could kill power to it during the winter months. Run the heat using the max a/c setting, turn the temp selector for the desired temp and enjoy.
I would not completely disconnect the compressor in case you need it for the defrost mode.
Another method would require applying full vac to the inlet duct door when in the heat mode. That isn't too hard but would require a second selector or solenoid setup.
A third option would be to wire the blower motor independent of the usual control. That would allow you to run the system in the "OFF" position and still be able to recirculate the air.
"Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes."
"When MAX A/C is selected:
The air inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.
The panel/defrost door is at full vacuum and the floor/panel door is in the no vacuum position, directing airflow to the instrument panel A/C register (19893).
The temperature is usually set for maximum cold but may be heated if desired.
Air will be picked up at the recirc opening by the blower motor (18527). Within the A/C control set for maximum cold, airflow across the A/C evaporator core (19860) will be diverted past the heater core (18476) and then directed into the passenger compartment through the instrument panel A/C register. There is also some airflow to the AC side window demisters.
The A/C compressor (19703) will be enabled when MAX A/C is selected.
The blower motor is on. "
Easiest thing to do would be put a cut off switch on the a/c compressor so that you could kill power to it during the winter months. Run the heat using the max a/c setting, turn the temp selector for the desired temp and enjoy.
I would not completely disconnect the compressor in case you need it for the defrost mode.
Another method would require applying full vac to the inlet duct door when in the heat mode. That isn't too hard but would require a second selector or solenoid setup.
A third option would be to wire the blower motor independent of the usual control. That would allow you to run the system in the "OFF" position and still be able to recirculate the air.
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metaldrgn
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Thanks but does it specify the same w/o eatc?
It's more than the compressor kicking on. I'll have to verify but it feels like the blend door is changing to cold. I've used ac with heat in my other vehicles and it doesn't take away all the heat. It shouldn't even be kicking on at these temps.
It's more than the compressor kicking on. I'll have to verify but it feels like the blend door is changing to cold. I've used ac with heat in my other vehicles and it doesn't take away all the heat. It shouldn't even be kicking on at these temps.
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metaldrgn
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Took a long time to look this up, but I think I found the answer. It isn't a timed circuit. It's the heater control valve and it blocks the coolant flow through the heater core in Max A/C and off positions only by applying a vacuum which explains why it slowly gets cold and I don't hear any doors moving. I'll have to cap the line going to this part to make it work. I had the schematics all along, I was just too lazy to look. This applies to the manual A/C setup, I don't know about the others.
Update: looked at schematics for eatc and it only shuts off the heater core in the off position. Spent a few hours looking for it and finally gave up and googled it. The picture on the Ford parts site is misleading. It's in the engine bay and easily accessible. I plugged the line and works great now on max A/C.
Update: looked at schematics for eatc and it only shuts off the heater core in the off position. Spent a few hours looking for it and finally gave up and googled it. The picture on the Ford parts site is misleading. It's in the engine bay and easily accessible. I plugged the line and works great now on max A/C.
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