Another Heater/Defroster Question
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Senior User
Joined: Jun 2003
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From: Kannapolis NC
Another Heater/Defroster Question
Since the 56 only has two controls, fan and heat/defrost, how is temp controled? Does the water have to be turned off in the summer to keep heat out of the cab?
Postmaster
Joined: Jun 2004
Posts: 4,190
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From: Riverside, So Cal
Learpilot -
My 56 has a stock heater in it and a control panel with 4 ***** mounted under the dash. The first **** is a 2-position (speed) switch for the fan. The second **** is a cable that opens/closes the water flow valve for water into the heater. The other two ***** are air and defrost, which are flapper door cable controls to either use inside or outside air and divert the heat to the windshield.
I recently replaced the cable-controlled water shutoff valve. To my surprise, by just adjusting how open the valve is (how far I pull out the temp ****), I can control the heat. As far as I know, that's all there is.
The two controls you mention must be a different option in the 56 that I haven't seen. Maybe others here know about that system setup.
My 56 has a stock heater in it and a control panel with 4 ***** mounted under the dash. The first **** is a 2-position (speed) switch for the fan. The second **** is a cable that opens/closes the water flow valve for water into the heater. The other two ***** are air and defrost, which are flapper door cable controls to either use inside or outside air and divert the heat to the windshield.
I recently replaced the cable-controlled water shutoff valve. To my surprise, by just adjusting how open the valve is (how far I pull out the temp ****), I can control the heat. As far as I know, that's all there is.
The two controls you mention must be a different option in the 56 that I haven't seen. Maybe others here know about that system setup.
Senior User
Joined: Jun 2004
Posts: 207
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From: San Jose, CA
Originally Posted by learpilot
Since the 56 only has two controls, fan and heat/defrost, how is temp controled? Does the water have to be turned off in the summer to keep heat out of the cab?
If yours doesn't but you don't want to add another **** you could get one of these early Bronco combo speed switches with cable pull. They are a bit expensive though.
Lead Driver
Joined: Jul 2003
Posts: 9,366
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From: AKRON ohio
Learpilot,
You have the less expensive of the two heaters available in 56. This unit was called the RECIRCULATING HEATER. You must turn off the manual vale on the intake manifold in the warm weather to stop the flow of water thru the heater core. Your truck should have a block off plate on the cowl behind the luvers on the cab
Randy,
Your heater is the top of the line in 56. This is what was called the MAGICAIRE HEATER or the FRESH AIR HEATER as many call it. Your truck should use the luvers on the side of the cowl to bring in the fresh air.
Kevin bigwin
You have the less expensive of the two heaters available in 56. This unit was called the RECIRCULATING HEATER. You must turn off the manual vale on the intake manifold in the warm weather to stop the flow of water thru the heater core. Your truck should have a block off plate on the cowl behind the luvers on the cab
Randy,
Your heater is the top of the line in 56. This is what was called the MAGICAIRE HEATER or the FRESH AIR HEATER as many call it. Your truck should use the luvers on the side of the cowl to bring in the fresh air.
Kevin bigwin
Senior User
Joined: Jun 2004
Posts: 207
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From: San Jose, CA
So that is what those louvers are for on my 56? Interesting.
You are supposed to install or remove the blocking plate depending on if you want fresh air to enter. Can't get more "manual" than that.
You are supposed to install or remove the blocking plate depending on if you want fresh air to enter. Can't get more "manual" than that.
Logistics Pro
Joined: Oct 2002
Posts: 4,489
Likes: 5
From: Valley Center, CA
My buddy has a 56 and he doesn't bother turning the heater hose off in the summer. As long as no air is flowing through the unit, there is no perceptible heat coming from that corner. I have riden in his truck many times and the heat was not noticed, what with all the air coming in the open windows. 
John
John
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Fleet Owner
Joined: Dec 2000
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From: Central PA
Originally Posted by boilerbots
So that is what those louvers are for on my 56? Interesting.
You are supposed to install or remove the blocking plate depending on if you want fresh air to enter. Can't get more "manual" than that.
You are supposed to install or remove the blocking plate depending on if you want fresh air to enter. Can't get more "manual" than that.
In my truck I do turn off the water flow at the engine block in the spring because I do notice heat in the cab even if the fan is not blowing air through the heater core.
The beauty of the Magic Aire (or fresh air) heater is that it was better for removing fog from the interior of the windows. I think that the recirculating heater when painted up looks much prettier than the magic aire.
abe
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Joined: Dec 2000
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From: Central PA
Originally Posted by packrat56
Anyone designed a way to direct defroster air at the side windows? I am working on it, but would love to see what others have done. Have a 56 F-100.
If I am using the truck on a cold day and don't want teh inside of the windsheild to fog up before the heater air is warm, I try to direct my exhaled breath out the side window, as usually I am breathing heavy after backing the truck out of the tiight space of my garage with my not yet rebuilt steering box and the radial tires!!!
abe
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