post #1 of Old 07-22-2013, 09:52 PM Thread Starter
hakukamana
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2010
Location: Kona
Posts: 66
No Heat

Just picked up a 90' MJ base 4.0 AX15 NP231, had not run in a while. Got it started. No heat coming out of the heater controls. Looks like it was converted to a open system, radiator has a cap and a overflow bottle that is zip tied to the AC delete bracket. The blower motor works, the heater controls work somewhat, I can get vent air blower on, I can get defrost air blower on, appears that there is no floor air coming out of the black box with two square holes. Looked at the heater hoses, there is a valve spliced into one that has a valve in it but not connected to anything to control it. I am going to flush and install a new thermostat, the bad thing about the truck is it has idiot lights no gauges. So I can't tell anything, it doesn't even have a tach.


93 YJ 5.2L Magnum, Custom rear bumper & swing out tire carrier, Ford Explorer electric seats, Ford 8.8, TW DS, SYE, NV231D, Autometer gauges, Rhinolined interior,Bushwacker flares, LED Lighting all around, MT Classic II, BFG 32/11.50/15, Warrior Body Armour, ZJ PV, DD BB, 52mm TB, Ford 23# Injectors, HS 1.7 RR, KC lights, RE Xpress 4" lift
hakukamana is offline  
post #2 of Old 07-24-2013, 08:37 AM
79chiefs
Registered User
1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington
Posts: 994
Can you move the valve by hand?

99WJ Laredo I6-A 2wd
88XJ-Building on a budget.
95 E34 540i-DD
79chiefs is offline  
post #3 of Old 07-24-2013, 10:17 AM Thread Starter
hakukamana
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2010
Location: Kona
Posts: 66
Yes I can move the valve by hand it has a flow arrow on the body and I have moved the lever in the direction of the arrow no difference. I read some where that you can remove the valve because it really dose not do anything. It should be vacumn controlled but it doesn't have a port on the valve, it looks like it was cable controlled.

93 YJ 5.2L Magnum, Custom rear bumper & swing out tire carrier, Ford Explorer electric seats, Ford 8.8, TW DS, SYE, NV231D, Autometer gauges, Rhinolined interior,Bushwacker flares, LED Lighting all around, MT Classic II, BFG 32/11.50/15, Warrior Body Armour, ZJ PV, DD BB, 52mm TB, Ford 23# Injectors, HS 1.7 RR, KC lights, RE Xpress 4" lift
hakukamana is offline  
post #4 of Old 07-24-2013, 10:32 AM
79chiefs
Registered User
1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington
Posts: 994
What about a clogged heater core? If it sat with the valve closed it could have clogged the core.

99WJ Laredo I6-A 2wd
88XJ-Building on a budget.
95 E34 540i-DD
79chiefs is offline  
post #5 of Old 07-24-2013, 11:29 AM
dkroll
Registered User
1988 MJ Comanche 
 
Join Date: May 2008
Location: Independence
Posts: 193
bypass the core and see if the hoses get hot to see if the core is the issue. Then the valve if needed. This will isolate a blockage.

Doug
dkroll is offline  
post #6 of Old 07-25-2013, 07:02 AM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,017
Quote:
Originally Posted by hakukamana View Post
Yes I can move the valve by hand it has a flow arrow on the body and I have moved the lever in the direction of the arrow no difference. I read some where that you can remove the valve because it really dose not do anything. It should be vacumn controlled but it doesn't have a port on the valve, it looks like it was cable controlled.
Yes. Ditch the valve.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
cruiser54 is offline  
post #7 of Old 07-26-2013, 10:14 AM Thread Starter
hakukamana
Registered User
1993 YJ Wrangler 
 
Join Date: Feb 2010
Location: Kona
Posts: 66
Update-OK, went through the entire system. Vacumn hoses brittle and leaking, thus the blower controls won't work correctly. (Fixed) Removed the thermostat, what a mess, it appears someone used something to stop a leak. I found what looked like hardened foam in the thermostat housing, started to clean it out and found a hole about the size of a pick in the housing.(Fixed) Replaced housing, new 180 thermostat & gasket. Before I put it all back together, complete flush, then back flush, pulled the heater control valve in the heater hoses, installed new heater hoses. Flushed heater core. 50/50 Antifreeze. (Fixed) Looks better, runs @ 180* on the money, verified with (DRBII Modis Scanner) no gauges, and the controls work the way they were supposed to run. I still can not find the heater valve control cable, and the black & white vacumn lines are repaired, black to the vacumn resv. The white I just installed a check valve.

93 YJ 5.2L Magnum, Custom rear bumper & swing out tire carrier, Ford Explorer electric seats, Ford 8.8, TW DS, SYE, NV231D, Autometer gauges, Rhinolined interior,Bushwacker flares, LED Lighting all around, MT Classic II, BFG 32/11.50/15, Warrior Body Armour, ZJ PV, DD BB, 52mm TB, Ford 23# Injectors, HS 1.7 RR, KC lights, RE Xpress 4" lift
hakukamana is offline  
Reply


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 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 On
Refbacks are On

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