1998 F150 5.4 A/C Problem - F150online Forums

Go Back  F150online Forums > Body > HVAC
1998 F150 5.4 A/C Problem > 1998 F150 5.4 A/C Problem

1998 F150 5.4 A/C Problem

Reply

 
 
  #1  
Old 06-12-2009, 09:25 PM
Junior Member
Thread Starter
Join Date: Jul 2007
Posts: 2
1998 F150 5.4 A/C Problem

I have a problem that just started about a month ago. My A/C has always worked well, no leaks in the system, compressor is also good. When I first start the truck, the A/C blows cold. As soon as I hit the accelerator I hear a clunk in the vents then it blows immediately HOT. I was driving today on about a 3 hr trip and the A/c blows hot until I stop at a light then I switch on the Air and it works good. As soon as I hit the accelerator same thing, clunk the immediate HOT. Does anyone have and ideas about this? I think I may have a vacuum issue but I don't know alot about A/C systems.
 
Reply With Quote
  #2  
Old 06-13-2009, 07:35 AM
Senior Member
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Posts: 6,145
Your blend door is busted and is flopping around in the plenum.

Extremely common. Many previous posts about it.
 
Reply With Quote
  #3  
Old 06-13-2009, 12:11 PM
Junior Member
Thread Starter
Join Date: Jul 2007
Posts: 2
Thanks I wasn't sure but, I will look around to see how to fix it. Thanks.


Well I pulled the floor vent out and the acuator. When I pulled the acuator out, out fell three plastic pieces. I fould the problem now I need to fix. Not sure if I am up to pulling dash out or not.
 

Last edited by jroc021; 06-13-2009 at 03:58 PM. Reason: Found Problem
Reply With Quote
  #4  
Old 07-31-2017, 08:47 PM
Junior Member
Join Date: Jul 2017
Posts: 4
actuator

Originally Posted by jroc021 View Post
Thanks I wasn't sure but, I will look around to see how to fix it. Thanks.


Well I pulled the floor vent out and the acuator. When I pulled the acuator out, out fell three plastic pieces. I fould the problem now I need to fix. Not sure if I am up to pulling dash out or not.
the problem im having on my 1998 fl150 4x4 there is no actuator where they say it is, nothing below the dash is like what i see in pictures or videos, i have the 4.6 manual,
 
Reply With Quote
  #5  
Old 07-31-2017, 09:00 PM
Senior Member
Join Date: Jan 2002
Location: Wilmington,NC
Posts: 3,427
Here's how to do it on a 98 F150. Several parts.

 
Reply With Quote
  #6  
Old 07-31-2017, 10:47 PM
Junior Member
Join Date: Jul 2017
Posts: 4
thanks

Originally Posted by Roadie View Post
Here's how to do it on a 98 F150. Several parts.

https://www.youtube.com/watch?v=Gt6jJwyjACw
thanks i downloaded all the vids , appreciate the help
 
Reply With Quote
  #7  
Old 08-10-2017, 09:51 PM
jbravo316's Avatar
Senior Member
Join Date: Jun 2005
Location: Ruckersville VA
Posts: 588
My 1997 started blowing hot all the time a few weeks ago. I am gonna go behind glove box to fix mine cause there aint no way I am taking the dash apart. Gonna replace plastic door with metal door as well.
 
Reply With Quote
  #8  
Old 08-11-2017, 08:53 AM
Junior Member
Join Date: Jul 2017
Posts: 4
blend door

Originally Posted by jbravo316 View Post
My 1997 started blowing hot all the time a few weeks ago. I am gonna go behind glove box to fix mine cause there aint no way I am taking the dash apart. Gonna replace plastic door with metal door as well.
I wish mine was that easy, my dash has to come out, i have cut the hole and taken the door out but i can access my activator motor, thats why the dash has to come out, if i could bend the metal piece at the top up out of the way to get the door in i could and i may have to cut one side of the circle piece that hold the top of the door to bend it, i might could get it in but it back in there a piece and im not sure that im going to even fix it my son suggested putting 2 cutoff valves under the hood on the heater hoses and just turn them off in summer, one thing i do know is im not pulling the dash, and damn ford for making this mess
 
Reply With Quote
  #9  
Old 08-11-2017, 10:14 AM
Senior Member
Join Date: Jan 2002
Location: Wilmington,NC
Posts: 3,427
Originally Posted by jbravo316 View Post
My 1997 started blowing hot all the time a few weeks ago. I am gonna go behind glove box to fix mine cause there aint no way I am taking the dash apart. Gonna replace plastic door with metal door as well.
Why do you think it's the blend door? Are the high and low pressures correct? Is the compressor clutch engaging?
 
Reply With Quote
  #10  
Old 08-11-2017, 10:57 AM
Junior Member
Join Date: Jul 2017
Posts: 4
hey

Originally Posted by Roadie View Post
Why do you think it's the blend door? Are the high and low pressures correct? Is the compressor clutch engaging?
i cut the hole behind the dash and took out the door that was broken at the bottom, the activator is working but i have no access to it under the dash,
 
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Kman52
1997 - 2003 F-150
8
07-29-2017 11:26 AM
mtnmanut
2015 - 2018 F-150
29
07-11-2017 10:47 AM
tsteve25
1997 - 2003 F-150
9
12-07-2015 08:20 AM
Deerjager
HVAC
3
07-11-2015 08:06 AM

Thread Tools
Search this Thread
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 Off
Refbacks are Off


Sponsors

All times are GMT -4. The time now is 09:04 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: