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  #13  
Old 02-28-2011, 02:34 PM
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Re: help with air in system PLEASE

Yeah, you probably have air in the system. There shouldn't be any reason to burp the system since it has an overflow tank. According to WJJeeps (this is what I did when I flushed my system a couple weeks ago):

1. Tighten the radiator draincock and the cylinder block drain plug(s) (if removed).

2. Fill system using a 50/50 mixture of ethyleneglycol antifreeze and low mineral content water. Fill radiator to top and install radiator cap. Add sufficient coolant to the reserve/overflow tank to raise level to FULL mark.

3. With heater control unit in the HEAT position, operate engine with radiator cap in place.

4. After engine has reached normal operating temperature, shut engine off and allow it to cool. When engine is cooling down, coolant will be drawn into the radiator from the reserve/overflow tank.

5. Add coolant to reserve/overflow tank as necessary. Only add coolant to the reserve/overflow tank when the engine is cold. Coolant level in a warm engine will be higher due to thermal expansion. To purge the cooling system of all air, this heat up/cool down cycle (adding coolant to cold engine) must be performed three times. Add necessary coolant to raise tank level to the FULL mark after each cool down period

http://www.wjjeeps.com/service/cooling.htm#DRAIN40
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  #14  
Old 02-28-2011, 03:26 PM
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Re: help with air in system PLEASE

If it was your water pump I would think you'd be overheating and never seeing cooler periods while driving. It would likely leak or seize too...and you'd be able to see if that was the case.
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  #15  
Old 02-28-2011, 03:33 PM
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Re: help with air in system PLEASE

what is the cylinder block drain plug for can i use this instead of the plug on the radiator
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  #16  
Old 02-28-2011, 03:38 PM
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Re: help with air in system PLEASE

The cylinder block drain plug is a plug in the side of the engine that allows coolant to flow out of the engine block only. It will not drain any coolant that is in the radiator.
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Old 02-28-2011, 03:58 PM
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Re: help with air in system PLEASE

Be VERY careful messing with that cylinder block drain plug. I have no personal experience but I know I've read on more than one occassion where people have had a hell of a time getting that off...snapping tools, breaking the plug itself (then you're screwed unless you buy one in advance), etc.
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  #18  
Old 02-28-2011, 04:26 PM
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Re: help with air in system PLEASE

Quote:
Originally Posted by zimzee View Post
what is the cylinder block drain plug for can i use this instead of the plug on the radiator
Don't worry about that. While the engine is cool, fill up the radiator and overflow tank with coolant/water mixture. Then turn your engine on, heater on, and let the engine run up to normal temp. Then let it sit and cool back down (a few hours). Check on it every 15-20 minutes and top off the overflow tank to keep the level at the FULL mark.

Once it's completely cooled down, make sure the overflow tank it at the FULL mark and start the engine again (with the heater on). Let it warm up to normal temp again and turn it off. Again, keep an eye on the overflow tank while it cools and top it off when needed. Then do this once more and you should be fine (3 times total).

Basically what it says on WJJeeps but you don't worry about step 1.
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Old 02-28-2011, 04:28 PM
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Re: help with air in system PLEASE

does anyone know where i can get a replacement plug for my radiator but keep in mind i am in the uk
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Old 02-28-2011, 09:21 PM
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Re: help with air in system PLEASE

Not sure what you've got in the UK, but around here that's a relatively standard part. I think I got one at a local Napa or Federated Auto Parts store. It's somewhat universal...best to take yours in to a parts store to find a match. IF you haven't broken it yet, you're really better off just pulling the lower hose off to drain. That draincock is a pain in the a$$.
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Old 03-01-2011, 10:37 AM
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Re: help with air in system PLEASE

D'oh never thought of that, im going to start again when i get the chance and wil post back o tell you if i have won or not lol. thanks everyone for your input.
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Old 05-02-2011, 12:00 AM
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Re: help with air in system PLEASE

i know im bringing a post back from the dead but i forgot to update.


the water pump needed replacing !!!
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  #23  
Old 05-02-2011, 05:54 AM
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Re: help with air in system PLEASE

Better going to the dealers for stuff like that or try jeepchryslerparts on ebay.

Dealers can be cheaper for things like that, so it's worth a shot.
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  #24  
Old 05-02-2011, 10:57 AM
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Re: help with air in system PLEASE

Have you replaced the radiator cap? The cap has a check valve in it that allows the coolant to pass back and forth from the overflow tank to the radiator. If the check valve is defective it may not allow the coolant to move back and forth. This can also help hold trapped air which usually show up as the engine cools and the upper radiator hose collapses because the check valve is closed and will not allow overflow coolant to be drawn in. As the engine heats up, it should push air out thru the cap and into the overflow tank which is vented allowing the air to escape. Eventually, the air will be pushed out and coolant will completely fill the engine system. This could be your problem!
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