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Old 07-24-2013, 06:14 PM   #1
iamacup's Avatar
Join Date: Jul 2012
Posts: 68
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.

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Old 07-24-2013, 10:00 PM   #2

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sounds like thermostat.

The Wolf is not concerned with the opinion of sheep.

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Old 07-25-2013, 09:32 AM   #3
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Location: Plano, TX
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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?
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Old 07-31-2013, 05:24 PM   #4
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Posts: 68
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.
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Old 08-01-2013, 03:20 AM   #5
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Join Date: Jun 2011
Location: Garland
Posts: 171
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.

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Old 08-01-2013, 04:07 AM   #6
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Location: Denton
Posts: 239
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???

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