Radiator won’t take the recommended amount of coolant - JeepForum.com
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  • 2 Post By kueh
  • 1 Post By downs
 
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post #1 of 8 Old 06-06-2020, 09:03 PM Thread Starter
Sobi1998
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Radiator won’t take the recommended amount of coolant

‘04 kJ 3.7L
The manual says it takes 14 quarts to fill the cooling system but I can only get about 2 gallons in before it’s “full”. I turned the heater on too and even drove it around
Any clue what’s up? It has over heated twice in the past week
The first time I replaced the coolant reservoir afterwards because it looked bad/broken
Today, it overheated while idling in the driveway. Drained the radiator and replaced the thermostat just to say I did

My troubleshooting:
-replaced the thermostat
-replaced the coolant reservoir
-jumped the electric cooling fan, it works
- the coolant does circulate back into the reservoir


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post #2 of 8 Old 06-07-2020, 07:23 AM
kueh
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Draining the radiator does not drain the entire cooling system.

Overheating is likely a thermostat issue.
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post #3 of 8 Old 06-07-2020, 11:01 AM
downs
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It's not an exact science. 14 quarts is when the system is new and completely empty. You'll never get all the coolant out of the system for a refill. Not sure how to do it on a KJ but on an XJ pulling the lower radiator hose gets the majority of it out of the block and radiator then a compressed air source blown though the heater core takes care of the majority of that one.
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post #4 of 8 Old 06-10-2020, 08:44 AM
RussB81
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I just did my water pump two days ago. The bearing failed and the pulley collapsed, shredding the impeller and spraying all my fluid out. I filled the bottle to the top, squeezed the bottom hose and it all sucked down, filled again, squeezed, and repeated til it stopped. I then squeezed the top hose a few times and topped off the bottle. I left the cap off, and turned the engine on. I let it run 10 minutes and added fluid. I capped it off and it runs like a champ. It took 10 quarts total.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #5 of 8 Old 06-19-2020, 07:53 PM
jeepjeepster
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Quote:
Originally Posted by Sobi1998 View Post
‘04 kJ 3.7L
The manual says it takes 14 quarts to fill the cooling system but I can only get about 2 gallons in before it’s “full”. I turned the heater on too and even drove it around
Any clue what’s up? It has over heated twice in the past week
The first time I replaced the coolant reservoir afterwards because it looked bad/broken
Today, it overheated while idling in the driveway. Drained the radiator and replaced the thermostat just to say I did

My troubleshooting:
-replaced the thermostat
-replaced the coolant reservoir
-jumped the electric cooling fan, it works
- the coolant does circulate back into the reservoir


Sent from my iPhone using Tapatalk
There should not be a reason to jump the cooling fan to get it to run. The fan should kick on around 217F. If its not, you need to figure out why its not kicking on.

Are you removing the bleed screw near the upper hose when filling it up with coolant?

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post #6 of 8 Old 06-19-2020, 08:03 PM Thread Starter
Sobi1998
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Quote:
Originally Posted by jeepjeepster View Post
There should not be a reason to jump the cooling fan to get it to run. The fan should kick on around 217F. If its not, you need to figure out why its not kicking on.

Are you removing the bleed screw near the upper hose when filling it up with coolant?

I don’t have a big enough Allen wrench so I was taking the return hose off the top corner until it flowed out


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post #7 of 8 Old 06-22-2020, 11:49 AM
RussB81
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I couldn't get my allen bolt loosened to burp the system. It is corroded in place. I just let the Jeep run without the cap and squeezed the upper hose some. I left the cap of the bottle until I knew the thermostat opened, even though I think the 3.7 uses a bypass style setup.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #8 of 8 Old 06-23-2020, 05:45 AM
Brad426
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I've found it difficult to bleed the air from the heater core in my 2004 Libby. You notice it in the winter with the heat on "hi". There is a sudden "gush" of warm air when making turns. A real head scratcher.
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