A/C Conversion for Heat - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-12-2004, 05:19 PM Thread Starter
 
Join Date: Feb 2002
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
 
A/C Conversion for Heat

Okay, I am trying to do a few more mods with what I've already got now that my idle problem is a little more under control.

The underdash A/C system that came on my YJ has not been used in probably 10 years and the condensor has had a small hole in it since before I got it. Therefore it is of little use as is...

I have removed the condensor to get better airflow through the radiator and capped off the compressor for building an OBA system later. The interior dash components are still in place and the blower works great. Here's my thought....

pipe the existing cooling core (?) behind the dash to circulate water from the heating system rather than freon to give me a secondary heater on those cold mornings and never put my hardtop back on.

Thoughts??

Thanks
jeepsteve is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-12-2004, 05:43 PM
Keyboard Implanted
 
JeepnGreg's Avatar
 
Join Date: Mar 2000
Location: Eureka IL
Posts: 4,676
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: A/C Conversion for Heat

sounds like a good idea if it fits

just make sure that with both your heaters on full blast you dont Over-cool you jeep....since running the temp too cool would run you at less than optimum efficiency.

also, would coolant be running through it all the time? if so it may get a lil tooo warm in the cab during the summer.


otherwise a great idea, can never have tooo much heat in an old jeep....except for summmer
JeepnGreg is offline  
post #3 of (permalink) Old 08-12-2004, 11:29 PM Thread Starter
 
Join Date: Feb 2002
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: A/C Conversion for Heat

In the comfortable warmth of a 95+ Mississippi summer (equal humidity) the motor temp is around 190-210 depending on if its cloudy or clear. I have a feeling that the motor will still run pretty hot even in our winters which ain't all that bad. If I can run the stock heater to defrost the windows on those few really cold mornings, I can run the other unit to keep the rest of me warm. With the half doors, most of the heat stays around my feet pretty well.

Anybody have any knowledge about the little A/C core? I know its pretty small diameter tubing in one end, I just want to be sure it moves enough water through it to stay warm and provide heat, otherwise its not worth it. I can't find any information on the core itself and have not pulled the system from under the dash to look at it.... I'm still in the conceptual stages on this one. I figure a T in the line going into the heater core and a T in the line coming back out through the firewall would be all I need. Maybe a reducer or two to pipe to the A/C core and back but that should be it, right?

Thanks in advance,
jeepsteve is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 08-12-2004, 11:38 PM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: A/C Conversion for Heat

1. Yes, it does work.
2. I did it on my 83 CJ7,
3. I T'd the heater core inlet-outlet,
4. And fed it into the under dash AC unit...
5. It keeps the CJ shirtsleeve warm,
6. Down to -40F in deep cold of
7. The Wisconsin Winters...
8. I say go for it!
LEVE is offline  
post #5 of (permalink) Old 08-13-2004, 04:16 AM Thread Starter
 
Join Date: Feb 2002
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: A/C Conversion for Heat

Even better idea.... thanks Leve. I thought I had come up with something pretty novel.... should have known you'd already tried it. Root beer to you [img]images/graemlins/40BEER.gif[/img]
jeepsteve is offline  
post #6 of (permalink) Old 08-13-2004, 10:05 PM
Keyboard Implanted
 
Join Date: Sep 1999
Location: Southeast Iowa
Posts: 6,394
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: A/C Conversion for Heat

[img]images/graemlins/smile.gif[/img] Well, Jeepsteve........ on our project CJ-7 we wanted air conditioning for these muggy summers here in Corn Ville, yet we knew and understood that we needed some additional defrosting capability for the fearsome Midwest winters. What we did was buy a box heater from JCW and we built a center section that goes between the seats and which has the box heater built into it. The box heater blows out on each front floor area to warm our feet, and that leaves the stock Jeep heater to deal with the frosted windshield. The heater section we made was also the riser for the after-market console we bought AND the B&M shifter. [img]images/graemlins/cool.gif[/img]
CJDave is offline  
post #7 of (permalink) Old 08-14-2004, 07:26 AM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: A/C Conversion for Heat

</font><blockquote><font class="small">In reply to:</font><hr />
yet we knew and understood that we needed some additional defrosting capability for the fearsome Midwest winters.

[/ QUOTE ]1. Well, Dave's got a good point.
2. With my system the <ul type="square">[*]OEM heater can be devoted to defrosting the windshield[*]The under-dash unit heats/circulates heat in the cabin.[*]It keeps the windshield/side window completely frost free under the harshest conditions.[*]I would suggest combining it with a windshield wiper modification

[/list]
3. Between the two, the mod works very well.
4. If anyone's interested in Dave's auxiliary heater box,
5. Take a look - at the SnoJeep Heater - .
6. In any case,
7. Either, or any, of these modifications,
8. Are project-worthy...
9. Especially before an impending winter.
LEVE is offline  
post #8 of (permalink) Old 08-16-2004, 10:16 AM Thread Starter
 
Join Date: Feb 2002
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: A/C Conversion for Heat

Thanks Dave and Larry... I'm sure glad I don't have to worry about the wiper upgrade for snow. I haven't seen hardly any snow since I moved out of the Great White North 14 years ago. I hate having a top on the jeep at all other than a bikini so summer A/C is not an issue even if it means I sweat like a hog... the hotter the better! The upgrade is strictly for a little more warmth in the winter which can be really harsh for about two or three weeks. [img]images/graemlins/beach.gif[/img] I appreciate all the help.

As always, this board is the first place I come for answers after Google!


jeepsteve is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

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