Heater problems
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
Heater problems
My heater in my 852' f-150 flareside isn't keeping the driver side window (front one) clear. After warming the truck up for a least 5-10 minutes the windshield will clear. Then about 3-5 miles down he road the driver side windshield starts to fog than about a minute it starts to ice up on the inside all the time. The only way to prevent this is by opening a window till I get to town (10minute drive) and the does it start to clear of enough to where I can shut the window. The rubber boot for the shifter on the floor is torn to pieces to could this be the problem?
82' Flareside with 400 horse under the hood
82' Flareside with 400 horse under the hood
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Heater problems
195* Thermostat
Heat cable actuater is correct.
Fan runs Okay
Sunvisor down.
See if these help.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
[i][font color=red]Calgary,Alberta,Canada[/font][i]
[font color=blue]Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [font/]
78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
Heat cable actuater is correct.
Fan runs Okay
Sunvisor down.
See if these help.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
[i][font color=red]Calgary,Alberta,Canada[/font][i]
[font color=blue]Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [font/]
78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
Moderator
Joined: Jan 2001
Posts: 56,965
Likes: 2,725
From: Virginia
Heater problems
Mine did this right after I bought it, and there was junk that people had layed on the dash board over the years accumulated in the duct, part of an old lcd watch, and other little papers and stuff.
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Post Fiend
Joined: Nov 2001
Posts: 5,871
Likes: 0
From: Coutts Canada
Heater problems
>Mine did this right after I bought it, and there was junk that >people had layed on the dash board over the years accumulated in the >duct, part of an old lcd watch, and other little papers and stuff.
Its not that cause me and my dad have replaced the top dash pad--it was off for awhile but when we put it back on I checked it to make sure, and I don't put stuff on the dash for that reaseon and also so I don't break that speaker outlet thingy.
82' Flareside with 400 horse under the hood
Its not that cause me and my dad have replaced the top dash pad--it was off for awhile but when we put it back on I checked it to make sure, and I don't put stuff on the dash for that reaseon and also so I don't break that speaker outlet thingy.
82' Flareside with 400 horse under the hood
Elder User
Joined: Dec 2000
Posts: 570
Likes: 1
From: Austin Texas (area)
Heater problems
[updated:LAST EDITED ON 21-Mar-02 AT 10:52 AM (EST)]There is a vacuum motor that controls the air-flow between the floor outlet and the defrost outlet. The motor has two vac hoses....if the motor works at all, those hoses could be reversed. If that is the case, air-flow to the defrost duct will not be correct. Check the vaccum motor for operation and check the vacuum hoses for correct attachment. The red color connects to port #5 on the function switch and to the 90degree fitting on the vac motor. The yellow color hose connects to port #2 on the function switch and to the straight fitting on the vac motor. That vac motor controls a door in the plenum that directs air to the floor only (full vac at motor(red) closes door to defrost outlet and allows only floor air)....partial vac to motor(yellow) allows air to both floor and defrost, no vac to motor allows no air to floor, only to defrost ducts. If the vac motor funtions properly, something is wrong with the door operation.....maybe stuck/something
Lead Driver
Joined: Oct 1999
Posts: 6,768
Likes: 547
From: Kalispell, MT
Heater problems
Your symptoms are typical of a leak in the heat exchanger (heater core). It doesn't fog up at first 'cause the coolant is same temp as the glass, but when the thermostat opens you get a gush of warm coolant that creates a warm fog on the cold glass and presto - fog and ice inside until it finally warms up enough to defrost.
Not a serious leak but dangerous from the standpoint of driving that way. You probably have smelled a slight coolant smell when it happens. My 86 is doing the same thing right now and I'm just waiting for a warmer day. ( -10F this am )
Not a serious leak but dangerous from the standpoint of driving that way. You probably have smelled a slight coolant smell when it happens. My 86 is doing the same thing right now and I'm just waiting for a warmer day. ( -10F this am )
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Moderator
Joined: Jan 2001
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From: Virginia
Heater problems
I went with my first theory because he said it was the drivers side only. I think all the other posts are valid reasons for the problem, but you would think it would cause a problem across the whole windshield. I am thinking the defroster plenum has one common source doesn't it?
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Thread Starter
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Post Fiend
Joined: Nov 2001
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From: Coutts Canada
Heater problems
Could the fan be going bad, if it was wouldn't the furthest place away from the source would get the least amount of heat right?
82' Flareside with 400 horse under the hood
82' Flareside with 400 horse under the hood
Senior User
Joined: Apr 2001
Posts: 253
Likes: 0
Heater problems
See if both heater hoses at firewall are hot after a long run.I don't care to change thermostats on small blocks.If they check out its a problem with dash components then.flaps/cables/debri/hoses
That is just a lot more humidity you would be putting into the air.
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