Go Back   Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 10-31-2011, 12:48 PM   #1
Junior Member
 
Join Date: Oct 2011
Location: Manhattan, KS
Posts: 2
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default 1988 F150- Heater Problems

I just replaced a bad heater core on my truck but it will still not blow hot. I checked the core and it is getting hot and I am blowing air but nothing hot.. any suggestions?

Alex
lexxluther11 is offline   Reply With Quote
Old 10-31-2011, 12:54 PM   #2
Dailydriving300ci-of-fury
 
65mechanic's Avatar
 
Join Date: Mar 2011
Location: North Carolina
Posts: 2,281
Mentioned: 0 Post(s)
Thanks: 44
Thanked 23 Times in 18 Posts
Feedback Score: 0 reviews
Default

Welcome to the forums! If you've ruled out that the core is getting hot, and yoyr blowing air then there's one more thing. Make sure the vent is open to blow across the core itself. I'm not sure exactly how the interior vents operate but your cables might not be opening to the core, thus just recirculating truck temperature air.
__________________
1988, 4.9 I6, C6, 4wd swapped, Geared 4.10, 31 Spline Axles, PowerTrax LockRight Lockers Front/Rear, Rough Country 6 inch lift, 35 12.5 15 Cooper STTs
65mechanic is offline   Reply With Quote
Old 10-31-2011, 01:30 PM   #3
Ford Fan
 
0927's Avatar
 
Join Date: Oct 2011
Location: Newburg, PA
Posts: 112
Mentioned: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Default

My '89 has A/C, all vents and doors are vacumm operated. I currently have the same issue. My truck sat for 19 years before I bought it, all the vacumm lines to the heat & AC are dry rotted. I started replacing the easy ones I can see and now have a little air moving into the cab, but not much.
__________________
1989 F150 XLT Lariet 4X4, 5.0 5 SPD Short bed.
"In wine there is wisdom, in beer there is Freedom, in water there is bacteria. ― Benjamin Franklin

BUILD http://www.f150forum.com/f78/1989-4x...-built-235340/
0927 is offline   Reply With Quote
Old 10-31-2011, 11:28 PM   #4
November 2011 TOTM Winner
 
5Rangers's Avatar
 
Join Date: Apr 2011
Location: Dallas area
Posts: 1,438
Mentioned: 0 Post(s)
Thanks: 14
Thanked 72 Times in 70 Posts
Feedback Score: 0 reviews
Default

There is a cable attached to the lever you adjust to set the desired temperature. It goes to a mixing valve which gets air that has passed through the heater core and mixes with the other source, either AC or outside. If this cable was broken or one end not attached then you would not be able to adjust the temperature of the air coming in the cab. I have an 88, the cable is notorious. It either breaks, disconnects or breaks the linkage it is attached to at one end or the other. It is easy to replace, simply pull the climate control head out of the dash, you'll see it right away. If your problem is not on that end, pull the glove box and follow the cable to its linkage.
__________________
November 2011 TOTM Winner, 88 1/2 ton swb 4.9 4spd man 4wd 3.55 gears, Rear Aussie Locker,Pro Gold 11" Luk clutch, 4" Rancho Lift, 2" body lift, 35" Maxxis Bighorns on Ultra Wheels, Rocksolid front Winch Bumper, 10k Engo Winch, 2.5 exhaust, Magnaflow muffler, 38 gallon Spectra rear tank, Bushwacker Flares, Warn premium hubs, FSB Transfer case skidplate, Knuckle under mod, 3G 160a Alternator mod.
5Rangers is offline   Reply With Quote
Old 10-31-2011, 11:57 PM   #5
Dailydriving300ci-of-fury
 
65mechanic's Avatar
 
Join Date: Mar 2011
Location: North Carolina
Posts: 2,281
Mentioned: 0 Post(s)
Thanks: 44
Thanked 23 Times in 18 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by 5Rangers
There is a cable attached to the lever you adjust to set the desired temperature. It goes to a mixing valve which gets air that has passed through the heater core and mixes with the other source, either AC or outside. If this cable was broken or one end not attached then you would not be able to adjust the temperature of the air coming in the cab. I have an 88, the cable is notorious. It either breaks, disconnects or breaks the linkage it is attached to at one end or the other. It is easy to replace, simply pull the climate control head out of the dash, you'll see it right away. If your problem is not on that end, pull the glove box and follow the cable to its linkage.
+1
__________________
1988, 4.9 I6, C6, 4wd swapped, Geared 4.10, 31 Spline Axles, PowerTrax LockRight Lockers Front/Rear, Rough Country 6 inch lift, 35 12.5 15 Cooper STTs
65mechanic is offline   Reply With Quote
Old 11-01-2011, 12:11 AM   #6
Senior Member
 
jrh5610's Avatar
 
Join Date: Dec 2010
Location: Carlisle,Kentucky
Posts: 540
Mentioned: 0 Post(s)
Thanks: 0
Thanked 7 Times in 6 Posts
Feedback Score: 0 reviews
Default

Check the white vacum line underneath the hood on the passenger side. It goes to a cylinder in the corner of the firewall and inner fender. Normally those will dry crack. Dig back into the harness where it comes out and cut it off. Get you some 5/32 vacum hose around 20" should do it slide one end onto the cylinder the other end onto what is left in the harness. That should do the trick.
__________________
If it won't come off get the blue wrench.
08 STX Scab 4X4 4.6L 3.55grs S&b cai, 2.5" exaust with 18" dynomax bullets, hypertech programmer, 2" leveling kit
91 reg cab 4x4 5.0 EFI .030 over 3.55grs nls
jrh5610 is offline   Reply With Quote
Old 11-01-2011, 02:42 PM   #7
Junior Member
 
Join Date: Oct 2011
Location: Manhattan, KS
Posts: 2
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Thumbs up 1988 F150- Heater Problems

Quote:
Originally Posted by 5Rangers View Post
There is a cable attached to the lever you adjust to set the desired temperature. It goes to a mixing valve which gets air that has passed through the heater core and mixes with the other source, either AC or outside. If this cable was broken or one end not attached then you would not be able to adjust the temperature of the air coming in the cab. I have an 88, the cable is notorious. It either breaks, disconnects or breaks the linkage it is attached to at one end or the other. It is easy to replace, simply pull the climate control head out of the dash, you'll see it right away. If your problem is not on that end, pull the glove box and follow the cable to its linkage.
Thank you, I would have never of thought of that! I went out and checked the cable and the wire that runs through it was bent before it went in and so I straighten it with a pair of plyers and now it works like a charm... Thank you so much for your help!!

Alex
lexxluther11 is offline   Reply With Quote
Old 11-01-2011, 07:12 PM   #8
Assistant Administrator
5 Year Member
 
ymeski56's Avatar
 
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 31,208
Mentioned: 13 Post(s)
Thanks: 54
Thanked 624 Times in 366 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by jrh5610 View Post
Check the white vacum line underneath the hood on the passenger side. It goes to a cylinder in the corner of the firewall and inner fender. Normally those will dry crack. Dig back into the harness where it comes out and cut it off. Get you some 5/32 vacum hose around 20" should do it slide one end onto the cylinder the other end onto what is left in the harness. That should do the trick.
I think what your referring to changes air discharge path. Defrost/ dash vents...
__________________
"Saving the World....One Ford Truck at a Time."
ymeski56 is online now   Reply With Quote
Old 11-02-2011, 08:24 PM   #9
November 2011 TOTM Winner
 
5Rangers's Avatar
 
Join Date: Apr 2011
Location: Dallas area
Posts: 1,438
Mentioned: 0 Post(s)
Thanks: 14
Thanked 72 Times in 70 Posts
Feedback Score: 0 reviews
Default

Glad I could help... Good job...
__________________
November 2011 TOTM Winner, 88 1/2 ton swb 4.9 4spd man 4wd 3.55 gears, Rear Aussie Locker,Pro Gold 11" Luk clutch, 4" Rancho Lift, 2" body lift, 35" Maxxis Bighorns on Ultra Wheels, Rocksolid front Winch Bumper, 10k Engo Winch, 2.5 exhaust, Magnaflow muffler, 38 gallon Spectra rear tank, Bushwacker Flares, Warn premium hubs, FSB Transfer case skidplate, Knuckle under mod, 3G 160a Alternator mod.
5Rangers is offline   Reply With Quote
Old 12-02-2011, 11:36 PM   #10
1988' F-150
 
Join Date: Dec 2011
Posts: 1
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default Help

My 1988 f-150 heater isn't working I can hear the blower but I don't feel anything through the vents... Even after I switch them to floor or panel still nothing
Zackpak is offline   Reply With Quote
Old 12-02-2011, 11:36 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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1988 F150 5.0 Fuel pump Problems BamaFordFan 1987 - 1996 F150 7 09-07-2011 03:26 PM
1988 f150 heater question? 88f150Fan 1987 - 1996 F150 1 01-16-2011 02:34 AM
1988 f150 300 6cyl fuel pump problems no1sirbutler 1987 - 1996 F150 2 11-19-2009 03:28 PM
Is there a step-by-step DIY for replacing heater core (1988 F150) ? I searched.. clapton is god 1987 - 1996 F150 8 09-19-2009 11:30 AM
1988 f150 starting problems fordguy2009 General F150 Discussion 1 03-15-2009 01:59 PM

Join F150 Forum

 

The Mustang Source
All times are GMT -4. The time now is 07:04 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.