Why has my heater stopped working? - JeepForum.com
 
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post #1 of 11 Old 02-27-2020, 07:49 AM Thread Starter
MikeSD
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Why has my heater stopped working?

This is an attempt to figure out the likely cause, based on symptoms alone. I haven't opened up anything to look around.

Problem: My heater barely works
And I have several symptoms that I noticed about the same time as the heater stopped. Actually it does put out a small amount of heat but not like it used to.

Also, this is on a 2017 JKU Rubicon (my 4th).

Symptoms:
1) Heat is minimal. And it will suddenly become no heat at all while on.

2) My temp gauge runs higher on warmup than I have ever noticed before. See pics.

It's usually just right if center. When this problem started, it rises to the 3/4 mark but returns to center.

3) My electric cooling fan runs for about 10 seconds after turning off ignition. Never noticed that before.

Testing: The only testing I've done is to turn fan full power, then operate the temp control from cold to hot without AC. I can detect air flow change so I think the blend door is working. just routing cool air.


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post #2 of 11 Old 02-27-2020, 07:51 AM Thread Starter
MikeSD
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PS:
How do I get formatted posts and post photos. The web interface with my phone doesnt offer any formatting.
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post #3 of 11 Old 02-27-2020, 07:54 AM
Kruzin
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Your thermostat may be sticking closed or partially closed, restricting coolant flow. It could explain all of your symptoms.
You could also just be low on coolant.

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post #4 of 11 Old 02-27-2020, 08:18 AM
ronjenx
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I also suspect low coolant.

Water flow through the heater core would not be restricted by a closed thermostat.

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post #5 of 11 Old 02-28-2020, 01:10 AM Thread Starter
MikeSD
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Silved:

I had to get an oil change anyway so I had the coolant checked. It was definitely low.

So I had some added and filled it back up.

For the 1st 30 min there was no change. temp gauge was still slightly high and heater didnt work. And the cooling fan still continued to run for about 10bsec after ignition turned off
So I went about the rest of my day.

Then, on a drive to pick up my daughter something happened. I noticed a blast of hot air. Suddenly the heater started working. Since that time I noticed

1) Heater putting out hot air
2) Tem no longer rose to the 3/4 mark.
3) And the cooling fan didnt run at all, after engine turned off.

For the rest of the day everything was perfect.

Does it make sense that it took a warmup time after adding coolant?

Tomorrow morning will be the real test. if it works in the morning when it's cold out the problem may have gone away.

Thanks
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post #6 of 11 Old 02-28-2020, 04:08 AM
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Yes, it makes sense, if they added the coolant to the overflow tank. The engine would need to heat up to draw the new coolant into the system. Once the system is full again, it should work normally.
And you should pop the hood this weekend and check the level in the overflow tank again to see if it needs any more topping off after a couple run cycles.

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post #7 of 11 Old 02-28-2020, 08:30 AM
222Doc
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as well you must have a leak. i would guess its the rad. they are known to fail . as well it is very hard to see the leak. tends to be the side tank to the alloy.

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post #8 of 11 Old 02-28-2020, 11:01 AM Thread Starter
MikeSD
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It was 36vdeg this morning. Got to work today with the heater working within a minute. No sign of temp rise. Back the way it used to be.

All symptoms gone.

Thanks.
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post #9 of 11 Old 02-29-2020, 01:25 PM
Geoskier9
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Could also be leaking from the oil cooler housing. I keep a bottle of antifreeze in the Jeep after a shop added the wrong color and I ended up with gray sludge
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post #10 of 11 Old 03-07-2020, 11:07 AM
LouC
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Those symptoms are of air in the cooling system and low coolant. Might want to double check for leaks as it is likely to recur, engines do not use coolant (normally!) we had this in the old ZJ (except not the running hot issue) and it was a leaky heater core. When adding coolant to the rad, it helps to use a Lisle radiator funnel, this helps really get all the air out.
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post #11 of 11 Old 03-10-2020, 10:20 AM
Enchantedfrog
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I have heard this problem on so many jeeps. My passenger side gets hot but driver side is barely Luke warm. How can that happen when all the air comes up the same tubes? I’ve flushed heater core 10 times. Helps a day or so and back to luke warm. If you find an answer help a brother out!!!
Chillin’
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