XJ: 97 XJ, weak heat - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old October 27th, 2013, 03:30 PM   #1
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default 97 XJ, weak heat

heater on my G/Fs XJ blows luke warm... moving the blend door it will get cold and then back to luke warm, I flushed the heatercore with water until it was pouring out clear, and it seemed to help slightly.

G/f isn't happy she is cold, help please.
skife is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old October 27th, 2013, 03:32 PM   #2
Mudking
Senior Member
 
Mudking's Avatar
 
Join Date: 02-15-13
Location: Chelsea/MI
Posts: 834
iTrader: (1)
Mentioned: 0 Post(s)
Default

Mine is that way to. On high heat its hardly warm. On low its warmer

Sent from my DROID RAZR HD using Tapatalk 2
Mudking is online now   Reply With Quote
Old October 27th, 2013, 03:48 PM   #3
firehawk
Live Action!
 
firehawk's Avatar
 
Join Date: 10-02-07
Location: Clawson, Michigan
Posts: 12,479
iTrader: (44)
Mentioned: 10 Post(s)
Default

Either clogged heater core or bad thermostat.
firehawk is offline   Reply With Quote
Old October 27th, 2013, 04:28 PM   #4
WACKO1
2000 xj
 
WACKO1's Avatar
 
Join Date: 05-06-13
Location: waterford mi
Posts: 721
iTrader: (2)
Mentioned: 0 Post(s)
Default

Plugged heater core
WACKO1 is offline   Reply With Quote
Old October 27th, 2013, 07:01 PM   #5
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default

going to flush it with acid tomorrow
skife is offline   Reply With Quote
Old October 27th, 2013, 08:07 PM   #6
t_ank
Senior Member
 
t_ank's Avatar
 
Join Date: 09-02-13
Location: lapeer
Posts: 407
iTrader: (6)
Mentioned: 1 Post(s)
Default

Flush it both ways. I hooked hoses end to my lines n threaded the house on so it got max pressure
t_ank is offline   Reply With Quote
Old October 27th, 2013, 08:38 PM   #7
Flexin' XJ
Senior Member
 
Flexin' XJ's Avatar
 
Join Date: 02-04-07
Location: Holt, MI
Posts: 4,459
iTrader: (19)
Mentioned: 0 Post(s)
Default

Don't leave the acid in too long. I flushed one at the dealer once and left it in a tad too long and it ate through the core. And if anybody knows how hard it is to replace a core on an S series Blazer, it wasn't worth it.
Flexin' XJ is offline   Reply With Quote
Old October 27th, 2013, 10:16 PM   #8
montecarlo33
The Violator
 
montecarlo33's Avatar
 
Join Date: 08-23-07
Location: Otsego County 49735
Posts: 4,466
iTrader: (19)
Mentioned: 4 Post(s)
Default

Where do you get the acid? Battery acid?
montecarlo33 is offline   Reply With Quote
Old October 27th, 2013, 10:20 PM   #9
Flexin' XJ
Senior Member
 
Flexin' XJ's Avatar
 
Join Date: 02-04-07
Location: Holt, MI
Posts: 4,459
iTrader: (19)
Mentioned: 0 Post(s)
Default

Carquest sells a radiator flush which I think is hydrochloric acid. Or something similar.

I would use a long transmission funnel which fits well into the hose end. But the acid will soften the plastic.
Flexin' XJ is offline   Reply With Quote
Old October 28th, 2013, 03:41 PM   #10
mudviper
getting dirty
 
mudviper's Avatar
 
Join Date: 12-22-06
Location: Flint
Posts: 802
iTrader: (12)
Mentioned: 0 Post(s)
Send a message via Yahoo to mudviper
Default

Try burping the system. I did all the stuff you did and still only put out luke warm air. After burping the system, getting all the air out, it start to push the heat out.
mudviper is offline   Reply With Quote
Old October 28th, 2013, 05:08 PM   #11
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default

Quote:
Originally Posted by mudviper View Post
Try burping the system. I did all the stuff you did and still only put out luke warm air. After burping the system, getting all the air out, it start to push the heat out.
trying to flush the core with vinegar right now.
skife is offline   Reply With Quote
Old October 28th, 2013, 06:51 PM   #12
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default

slightly better, going to put a thermostat in it tomorrow.
skife is offline   Reply With Quote
Old October 28th, 2013, 08:44 PM   #13
Mudking
Senior Member
 
Mudking's Avatar
 
Join Date: 02-15-13
Location: Chelsea/MI
Posts: 834
iTrader: (1)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by skife View Post
slightly better, going to put a thermostat in it tomorrow.
Ours (my wife's dd also) runs just under 210 all the time. So didn't imagine a tstat helping. I'm gonna try the same this weekend. Flushing and burbing

Sent from my DROID RAZR HD using Tapatalk 2
Mudking is online now   Reply With Quote
Old October 28th, 2013, 09:09 PM   #14
firehawk
Live Action!
 
firehawk's Avatar
 
Join Date: 10-02-07
Location: Clawson, Michigan
Posts: 12,479
iTrader: (44)
Mentioned: 10 Post(s)
Default

You can check the temps of the hoses to see if the coolant is flowing, check at different spots like at the upper radiator and lower and the heater hoses. An infrared or laser thermometer is easiest but contact thermometers can work too.

This can tell you if the thermostat is not opening or if the heater core is clogged.
firehawk is offline   Reply With Quote
Old October 29th, 2013, 06:44 AM   #15
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default

Upper rad hose was warm when temp gauge said 205, heater hose that's up there is just warm too.
coolant is brown and nasty. This weekend itll get wheel bearings and a coolant flush
skife is offline   Reply With Quote
Old November 4th, 2013, 05:31 AM   #16
skife
Senior Member
 
skife's Avatar
 
Join Date: 02-12-07
Location: cedar springs mi
Posts: 5,117
iTrader: (5)
Mentioned: 0 Post(s)
Send a message via AIM to skife Send a message via MSN to skife
Default

Coolant flush didn't help much.
skife is offline   Reply With Quote
Old November 4th, 2013, 11:53 AM   #17
95ZJTIM
Senior Member
 
95ZJTIM's Avatar
 
Join Date: 06-07-10
Location: Oshtemo/PawPaw/Kzoo
Posts: 569
iTrader: (1)
Mentioned: 0 Post(s)
Default

time for a heater core. Fun stuff. weekend repair if you DIY
95ZJTIM is offline   Reply With Quote
Old November 4th, 2013, 07:15 PM   #18
firehawk
Live Action!
 
firehawk's Avatar
 
Join Date: 10-02-07
Location: Clawson, Michigan
Posts: 12,479
iTrader: (44)
Mentioned: 10 Post(s)
Default

Check the diverter valve by the firewall
firehawk is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -5. The time now is 07:25 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.23708 seconds with 75 queries