No heat, recent dash removal/radio install... - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-08-2012, 04:45 PM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
No heat, recent dash removal/radio install...

Just to start off, my coolant level is fine and everything is operating normally, not a case of head gaskets/oil coolers/low coolant(studs/gaskets/egr delete done in January).
I recentlly did a new head unit install and had the entire dash out and all plugs harnesses removed (2 months ago). Today I went to turn the heat on and it just blows cold. At normal op temp, no matter how long the engine is running, regardless of rpm, there is no heat, just blows cold. All vents blow at thier designated location when switched to & a/c works perfectly. I popped the dash out w/o disconnecting any harnesses to see if I could find a loose connection today when I got home from work. Everything looked good behind the control switches for air/heat/fan/etc and there were no disconnected or crimped vacuum hoses....
So, Im trying to find where to look and what to do next. I cant get the thought out of my head that I did somthing when I had my dash apart a couple months back....
Any input is appreciated!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-08-2012, 04:48 PM
Compression Ignition Addict
 

Join Date: Feb 2008
Posts: 8,290
Thanks: 69
Thanked 199 Times in 189 Posts
Feedback Score: 0 reviews
well the heater bypass comes to mind // it's under the hood and near the oil fill it should default to open when no vacuum but they have been known to fail closed
Reply With Quote Quick reply to this message
  #3  
Old 11-08-2012, 04:56 PM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by ZMANN View Post
well the heater bypass comes to mind // it's under the hood and near the oil fill it should default to open when no vacuum but they have been known to fail closed
Thanx ZMANN, Im not familiar with the heater bypass or how it works, does the heater bypass "bypass" the heater core? when open it allows the coolant to stay flowing to the core and if closed it bypasses the heater core alltogether?
thanx for your input!
Reply With Quote Quick reply to this message
  #4  
Old 11-08-2012, 05:00 PM
Compression Ignition Addict
 

Join Date: Feb 2008
Posts: 8,290
Thanks: 69
Thanked 199 Times in 189 Posts
Feedback Score: 0 reviews
yes it will block coolant flow to the heater when max AC ( recirc) is selected

easy to find under the hood .. it has a vac line running to it ,, just right of the oil fill tube
Reply With Quote Quick reply to this message
  #5  
Old 11-08-2012, 05:11 PM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Just went out and checked it, the vac line is connected. when I pulled it off the little actuator moved outwards and when reconnecting the line the actuator pulled back in. Im assuming this is operating normally? thx
Reply With Quote Quick reply to this message
  #6  
Old 11-08-2012, 05:50 PM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Ok, I ran a little test on the heater control valve. When the truck is running and at operating temp, the control valve arm is pushed out. It stays out if I have it set to hot or cold on the temp knob and also stays out if i pull the vacuum line off. When I shut the truck off the arm on the heater control valve pulls in and stays in. So now Im unsure on my next move. Is the valve working properly? Am I not seeing vacuum in this hose due to the hot/cold control knob malfunctioning? Holp this helps someone to offer input on my situation...thx
Reply With Quote Quick reply to this message
  #7  
Old 11-09-2012, 01:40 PM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Ok, i ran yet another test if this helps. This morning I ziptied the valve on the heater control valve thinking it wasnt getting vacuum, thus Id feel some heat but I got the same results, cold air. So, it doesnt matter where I have the temp dial or wich way the heater valve is oriented it just blows cold.....hoping somone can chime in with some suggestions.....

Sent from my HTC Sensation 4G
Reply With Quote Quick reply to this message
  #8  
Old 11-09-2012, 04:11 PM
Premium Member
 

Join Date: May 2012
Location: Anchorage
Posts: 1,338
Thanks: 20
Thanked 40 Times in 34 Posts
Feedback Score: 1 reviews
Check to see if the heater core is getting warm, just to make sure it's getting circulation. There are just a few screws in the cover behind the glove box. If it is getting hot then you have an electrical issue somewhere. Also the heater bypass under the hood should stay open unless it's on max a/c. there is also are two vacuum lines right to the left of the heater core with a disconnect to allow removal of the heater core, you may want to check that.
Reply With Quote Quick reply to this message
  #9  
Old 11-10-2012, 06:51 AM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Excellent info, Ill check that out this morning. Thank you for your help!

Sent from my HTC Sensation 4G
Reply With Quote Quick reply to this message
  #10  
Old 11-11-2012, 05:35 AM
Compression Ignition Addict
 

Join Date: Aug 2011
Posts: 157
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
I wanted to come back and thank you guys for your help. I went through the loops and narrowed it down to the control motor or the door blend motor. The auto parts store had the door blend motor for $35 so I decided to swap it and it worked.....
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 03:49 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors