Took her out, had a play, heater broken. - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 07-24-2013, 07:14 PM   #1
iamacup's Avatar
Join Date: Jul 2012
Posts: 68
iamacup is on a distinguished road
Took her out, had a play, heater broken.

G'Day guys,
Firstly I took out the Rig for a play the other day, was fantastic, got bogged, got winched had fun and covered her in mud. Fantastic day all round.

However now a week later the heater has stopped working completely, it was always a bit asthmatic from the PO but now it just pumps out cold cold cold air. Now this is a problem in Canberra, where at the moment we're having -5 mornings. Yes it could be colder, o well. I moved to Australia for a reason.

So recently (when it was asthmatic and well before the day out) I have flushed the heater core and that got it working better. Today after driving home for twenty minutes and still having cold air come out I checked the heater core hoses in the engine bay, both were warm, not even close to hot unlike the top hose on the radiator, this nearly burned my hand, this would explain why I have no hot air in the cab. So any ideas what is causing this? My UN-educated guess would be the thermostat, so I am looking to replace this.

Is this a logical step in diagnosis or will I be wasting my time?

Cheers guys, also check out the Pics from the day out.

Attached Thumbnails
Click image for larger version

Name:	DSCF0338.JPG
Views:	83
Size:	186.4 KB
ID:	276974   Click image for larger version

Name:	DSCF0332.JPG
Views:	78
Size:	139.1 KB
ID:	276975  

Click image for larger version

Name:	DSCF0331.JPG
Views:	74
Size:	159.3 KB
ID:	276976   Click image for larger version

Name:	DSCF0326.JPG
Views:	80
Size:	136.4 KB
ID:	276977  

iamacup is offline   Quote
Old 07-24-2013, 11:00 PM   #2

WF Supporting Member
::WF Moderator::
Sinister6's Avatar
Join Date: Jan 2013
Location: Colorado Springs
Posts: 7,601
Sinister6 is on a distinguished road
sounds like thermostat.

The Wolf is not concerned with the opinion of sheep.

Sinister6 is online now   Quote
Old 07-25-2013, 10:32 AM   #3
kdilly's Avatar
Join Date: Mar 2013
Location: Plano, TX
Posts: 367
kdilly is on a distinguished road
Originally Posted by Sinister6 View Post
sounds like thermostat.
X2... Cheap and easy to replace too with the right tools. Just Did mine last weekend. Is it overheating at all? Or running at low temperatures?
Kdilly's Build thread:
kdilly is offline   Quote
Old 07-31-2013, 06:24 PM   #4
iamacup's Avatar
Join Date: Jul 2012
Posts: 68
iamacup is on a distinguished road
No, it seems to maintain a good temp once it gets there, and that doesn't take too long either. I am a it baffled by it.
iamacup is offline   Quote
Old 08-01-2013, 04:20 AM   #5
Garlandxj's Avatar
Join Date: Jun 2011
Location: Garland
Posts: 171
Garlandxj is on a distinguished road
Several things could be the issue. The Jeep uses an open loop system so the heater core always has coolant flowing through it.
1. Replace thermostat - Its cheap and may as well eliminate it.
2. Make sure the feed and return hoses are not blocked. (There are only two and they are not hard to get off. Take them off and look through them. Are they clear? Good now we can move forward. (The chance of them being blocked is slim but if you don't check you they will be clogged Murphy's Law)
3. Double check that there is good flow through the heater core.
4. Check blend door. - If the blend door is not allowing air to pass over the heater core then it will never blow cold air. (Normally this happens in reverse blend door allowing A/C air to flow over the heater core as well causing hot air instead of cold)
5. Make sure blower motor is working. (Stupid I know but some people won't tell you until afterwards that its not BLOWING hot or cold air )
6. Double check coolant levels - too little coolant can cause steam pockets and prevent coolant from getting to the heater core

7. If its still not working rinse and repeat because you missed something.

Garlandxj is offline   Quote
Old 08-01-2013, 05:07 AM   #6
curt68's Avatar
Join Date: Aug 2013
Location: Denton
Posts: 239
curt68 is on a distinguished road
Just and idea. Might tryt o reverse flush the system and see if you got some gunk in or on the way to the heater core. Maybe???

curt68 is offline   Quote

Thread Tools

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

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:39 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner