Defrost Duct -
LinkBack Thread Tools
post #1 of 7 Old 11-23-2013, 08:36 AM Thread Starter
Registered User
1974 CJ5 
Join Date: Sep 2001
Location: detroit
Posts: 33
Defrost Duct

Model: 1974 cj5 I6 26,000 Original Miles

I have a couple questions about the defrost duct, I left the Jeep with the wife yesterday and I received a very "pleasant" phone call about the "lovely rattlin death trap that does't even have defrost" from her.

this is the duct I'm asking about

1.How many ducts do I need? one,two or twenty?
2.Do I need to remove the dash panel to instal them?
3.Do the upgraded ducts really work?
4. Is there anything else I should look at replacing to help improve the defrost ability of my Jeep?

Last edited by bugb; 11-23-2013 at 08:36 AM. Reason: subscribe
bugb is offline  
Sponsored Links
post #2 of 7 Old 11-23-2013, 08:57 AM
Registered User
1966 CJ5 
Join Date: Oct 2012
Location: Two Harbors
Posts: 1,111
well, you only need 2 of them, one for pass side and one for driver's side. also replace the hose/duct that goes to each of them. easy to find at your local car parts place.
it's easier to do if you can lower the windshield, otherwise it all should be accessible under the dash. not always easy to get up under there, but can be done.
while you're about it, might as well check the heater core for leaks, that the heater motor is spinning without any rattles, the hoses and clamps are not leaking, and that the heater/air intake is free and clear of any debris that might be restricting air getting into it.
good luck to you for sure.

1966 CJ5A, mods are coming
1966 Wagoneer, bone stock
strvger01 is offline  
post #3 of 7 Old 11-23-2013, 09:30 AM Thread Starter
Registered User
1974 CJ5 
Join Date: Sep 2001
Location: detroit
Posts: 33
Thanks, heat works fine but the motor does have a little rattle on startup.
bugb is offline  
post #4 of 7 Old 11-23-2013, 09:55 AM
Registered User
1986 CJ7 
Join Date: Sep 2013
Location: Ridgefield
Posts: 531
Unless something is different because it is older, I only needed one of them for my '86. It goes from the flexible accordion tube up to the center below the windshield.

I installed mine an easier way, but afaik I cheated. I folded down the windshield, worked the duct up from beneath the dash being gentle with the wiring, and screwed down into it from above. I used self tapping screws right into the holes in the plastic duct. Tighten by hand, and use the correct size screws, you don't want to crack or strip out the plastic! The duct I got was fairly soft plastic so the screws bit into it easily and it ended up being tightly mounted.

I really don't know if screwing down from the top beneath the windshield is the original way they are mounted, bit it worked perfectly for me.

Don't forget to order the accordion tube if you don't have one.
ScroungerLee is offline  
post #5 of 7 Old 11-23-2013, 09:45 PM
Registered User
1970 CJ5 
Join Date: Jan 2013
Location: Denver
Posts: 30
x2 - this is exactly how I did mine as well. Not sure what the heater is exactly in the 1974, but there are two upward hose connections on the pre 72 ones and only 1 is used for the defrost duct connection. The one closer to the driver side is covered or plugged. Again not sure exactly what might be different by 1974, but the plastic duct you show is the same as mine. Flop down the windshied and mount from top - a second set of hands helps hold the duct up under the dash while you screw in.
jco6560 is offline  
post #6 of 7 Old 11-23-2013, 10:07 PM
Registered User
1979 CJ7 
Join Date: Jul 2009
Location: nc
Posts: 10
Check to see what the lines running to vents look like, might be cracked or have fallen off.

Also might want to look into doing the blazer blower motor upgrade
macjnga is offline  
post #7 of 7 Old 11-25-2013, 01:06 PM Thread Starter
Registered User
1974 CJ5 
Join Date: Sep 2001
Location: detroit
Posts: 33
Thanks guys, I have ordered up a couple ducts (just to be safe) and I just now need to find a buddy that will let me use his garage for a Saturday.
bugb is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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 Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome