Notices
Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

Heater only blows one speed

Thread Tools
 
Search this Thread
 
Old Dec 7, 2009 | 09:45 PM
  #1  
Ibuildembig's Avatar
Ibuildembig
Thread Starter
|
Senior User
Joined: May 2005
Posts: 110
Likes: 0
From: Fruitland MO
Heater only blows one speed

Tried changing the switch and the blower motor...still the same. I remember something about a 70's model truck having issues with a relay??? Is this the case with these gen trucks too?
 
Reply
Old Dec 7, 2009 | 09:56 PM
  #2  
starmilt's Avatar
starmilt
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
There is a small block with I belive 4 wires hooked to it it is not a relay but changes the voltage sent to the motor.
 
Reply
Old Dec 7, 2009 | 10:03 PM
  #3  
Ibuildembig's Avatar
Ibuildembig
Thread Starter
|
Senior User
Joined: May 2005
Posts: 110
Likes: 0
From: Fruitland MO
Hmmm, replaceable part I am assuming? Where is that dude located on the truck?
 
Reply
Old Dec 7, 2009 | 10:05 PM
  #4  
GHeTTo JOe's Avatar
GHeTTo JOe
Elder User
Joined: Aug 2008
Posts: 821
Likes: 1
From: 50450 IOWA
Just high speed work? i would suspect the resistor, should be in the duct work after the blower motor. the blower keeps air moving over the resistor keep it cool.
 
Reply
Old Dec 7, 2009 | 10:14 PM
  #5  
PLC7.3's Avatar
PLC7.3
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
Between the fan and the a/c in the engine bay there will be a resister on the heater plenum.
 
Reply
Old Dec 7, 2009 | 10:25 PM
  #6  
Ibuildembig's Avatar
Ibuildembig
Thread Starter
|
Senior User
Joined: May 2005
Posts: 110
Likes: 0
From: Fruitland MO
Thanks for the info, is the resistor a ford only part?
 
Reply
Old Dec 7, 2009 | 10:33 PM
  #7  
GHeTTo JOe's Avatar
GHeTTo JOe
Elder User
Joined: Aug 2008
Posts: 821
Likes: 1
From: 50450 IOWA
should not be, what is your truck?
 
Reply
Old Dec 7, 2009 | 10:38 PM
  #8  
Ibuildembig's Avatar
Ibuildembig
Thread Starter
|
Senior User
Joined: May 2005
Posts: 110
Likes: 0
From: Fruitland MO
Working on an 86 F350 for a buddy
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-1

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-2

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-3

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-4

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
story-5

Top 10 Ford Truck Tragedies

 Joe Kucinski
story-6

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

 Brett Foote
story-7

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

 Michael S. Palmer
story-8

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

 Verdad Gallardo
story-9

10 Best Ford Truck Engines We Miss the Most!

 Joe Kucinski
Old Dec 7, 2009 | 10:53 PM
  #9  
GHeTTo JOe's Avatar
GHeTTo JOe
Elder User
Joined: Aug 2008
Posts: 821
Likes: 1
From: 50450 IOWA
you can try your local parts house, my Napa would take couple days if they could get it. looks like LMC Truck has 2 option with or without A/C
LMC Truck Parts - Page 109
<table><tbody><tr><td valign="top" align="right">
</td> <td class="widetext" valign="top" align="left">
</td> </tr> <tr> <td valign="top" align="right">
</td> <td class="widetext" valign="top" align="left">
</td></tr></tbody></table>
 
Reply
Old Dec 7, 2009 | 11:04 PM
  #10  
Ibuildembig's Avatar
Ibuildembig
Thread Starter
|
Senior User
Joined: May 2005
Posts: 110
Likes: 0
From: Fruitland MO
Thanks again, I will give it a shot tomorrow!
 
Reply




All times are GMT -5. The time now is 04:49 AM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-2
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE