Go Back   F150online Forums > Body > HVAC
Sign in using an external account
Register Forgot Password?

Welcome to F150Online Forums!
Welcome to F150Online.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the F150Online Forums community today!





Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 12-27-2012, 05:56 PM
Junior Member
 
Join Date: Dec 2012
Location: NW Oregon
Vehicle: 1985 Ford F150
Posts: 2
Aaron Timm
Question 85 F-150 windshield defrost problem

Hello, I've been having some problems with my F-150's heater. First I noticed that I don't have a windshield defroster any more. Then I started smelling antifreeze in the air. Well, I figured I should be able to fix all of this, after all, heater cores and actuators are easy to replace once you pull the dash cap, the glove box, and the stereo.

Well, the heater core wasn't too bad and it only cost me about $50 for a replacement. But when I started looking into the defrost, I found out that the actuator is working, in fact, all of them are. I just don't have air flow to anything but the dash vents.

So, how far do I have to tear it down to remove the heater ducting, and once I remove it, is the diverter something that can be fixed? Or am I going to have to raid the junk yard for a replacement piece?

Any help would be appreciated.
Reply With Quote
  #2  
Old 12-27-2012, 07:25 PM
Senior Member
 
Join Date: Apr 2012
Vehicle: 2011 Ford F150
Posts: 559
Likely a vacuum problem in the control system inside the dash. normally the 'default' configuration is to the defrost-vents when there is a problem. there is a vac-motor that controls the air direction within the plenum. that motor either sends the air flow to the dash registers or lets it pass downstream to the floor/defrost motor control vents. the panel door vac motor has a blue hose to it from the function control selector. the downstream 2-circuit vac motor has a red and a yellow vac hose to control each vac circuit in that motor. there is also a white vac hose to the outside air control motor. first thing to check is the vac check valve on the firewall in the engine compartment to make sure vacuum is reaching the function control panel.
Check for vac from the check valve to the vacuum manifold behind the function control. There is always vac to that control. The blue hose from the function controller should not have vac when the selector is in defrost/floor. If there is no vac at the blue hose then I'd say the panel door is jammed. Find the vac motor in the blue hose circuit and the panel door has a vac line attached.
Here are some excellent pictures of the heater, click on the thread. http://www.ford-trucks.com/forums/10...cs-needed.html
__________________



Women might not find ya handsome but they'll find ya in your F150
Ford Built_Ford Tough

Last edited by papa tiger; 12-27-2012 at 07:35 PM.
Reply With Quote
  #3  
Old 12-28-2012, 03:59 PM
Junior Member
 
Join Date: Dec 2012
Location: NW Oregon
Vehicle: 1985 Ford F150
Posts: 2
Aaron Timm
Ok, I saw the two vacuum actuators and the temperature regulator and they all have full range of motion. The one actuator is approximately behind the stereo and it moves when I switch it from floor to mix to defrost. The other actuator is behind the glove box and moves between AC, vent, and heater. Is there a 3rd actuator? (Besides the cable to the temperature regulator.)

I suspect that the flapper that is supposed to be attached to the one behind the stereo is broken or no longer attached. How much of the dash to I have to pull out to get to that piece?
Reply With Quote
  #4  
Old 12-28-2012, 10:40 PM
Senior Member
 
Join Date: Apr 2012
Vehicle: 2011 Ford F150
Posts: 559
When these trucks were new, failure of the vacuum switch was very common. Also a better ground for the blower motor speeds it up.
__________________



Women might not find ya handsome but they'll find ya in your F150
Ford Built_Ford Tough

Last edited by papa tiger; 12-28-2012 at 10:52 PM.
Reply With Quote
Old 12-28-2012, 10:40 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 11:29 PM.


 
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details