Question about 2000 Jeep Cherokee

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Radiator Flush I have drained the radiator and need to know what do from here. Do I leave the valve open while the engine is running and keep water from the hose introducing fluid into the cooling system? Or should I be going about this differently? Ultimately, I have a small leak in my head gasket and will be adding Bar's Leaks to fill the viod. The jeep has never overheated and loses water. I have to add water about every 4 days. I have checked the coolant system for leaks and found none. No water escapes from the exhaust nor is there any white smoke. The oil is an off white color indicating water in the oil. I changed out the oil and filter. I want to get the Bars into the system before driving it again and having water show up in the oil. After the fixes, should I go ahead and change the oil again? Also, the heat works sometimes and when it does, it barely works. Any help or advice you guys can give me will be greatly appreciated. We finally own this Jeep and want to keep it running in good condition. Thanks in advance! Zenon, Lakeland, FL

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  • genonkylz Feb 16, 2009

    Thanks! I already changed the oil but have not run it yet. I wanted to add the Bars Head Gasket Fix before running the engine. Didn't want to contaminate the oil prior to adding the Bars additive. Should I change the oil it again after adding the Bars and running it?

    Also, is it absolutely necessary to use a coolant system cleaning agant I have seen people mention or is that just for really clogged up cooling systems that show signs of overheating? I just replaced my cooling system about 2 years ago.

    Also, something weird happened yesterday, I was watching the temp gage and it suddenly dropped from normal operating temp (120 degrees F) to a little over 110. Then it began to fluctuate a little before I decided to shut down the engine. When I opened the hood, there was no evidence of overheating like smoke/steam nor was it above the normal ouch temp when touching it. What I mean is that it was not so hot that it immediately burned the hell out of me. I have never seen this before. Could it be the sending unit or does it run from a fuse I could check?

    Thank you VERY much

    FMXTWO!!! Your assistance is priceless! And the quick response is appreciated as my jeep is up on jack stands at the

    Best Regards,

  • genonkylz Feb 17, 2009

    Thanks again, I'll change out the new oil I put in again after a couple months. I went ahead and changed the oil/filter after noticing it looked like a vanilla milkshake, then flushed the radiator and added the Bars. The water from the radiator came out as clear as it went in. Hopefully that's good sign since the radiator is fairly new. Another problem has suddenly arisen. My temp gage is acting erratically. It's usually at a normal temp of 210 +/-. Yesterday the gage went to reading zero then rose back to 210. The gage does this very quickly, as if someone is "unplugging" it from the engine then plugging it back in. Is there a sensor that's easily replaced or a fuse that's shorting? I just don't have a clue why it's jumping around like this. BTW, since I put the Bars in, the oil is a normal, almost clear color. But it's only been a day. Wouldn't water in the oil be evident very soon after an oil change? Thanks again.

    Very Best,


  • genonkylz Feb 18, 2009

    Thanks again, I'll change out the new oil I put in again after a couple months. I went ahead and changed the oil/filter after noticing it looked like a vanilla milkshake, then flushed the radiator and added the Bars. The water from the radiator came out as clear as it went in. Hopefully that's good sign since the radiator is fairly new. Another problem has suddenly arisen. My temp gage is acting erratically. It's usually at a normal temp of 210 +/-. Yesterday the gage went to reading zero then rose back to 210. The gage does this very quickly, as if someone is "unplugging" it from the engine then plugging it back in. Is there a sensor that's easily replaced or a fuse that's shorting? I just don't have a clue why it's jumping around like this. BTW, since I put the Bars in, the oil is a normal, almost clear color. But it's only been a day. Wouldn't water in the oil be evident very soon after an oil change? Thanks again.

    Very Best,



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There is no right or wrong for this one but on a car w/ no gasket leaks you can leave that valve open.Keep a CLOSE eye one the temp gauge and oil gauge while your doing it.Change that oil for sure after you flush & refill w/ anti freeze. Since you said you finally own it & want to keep it,you'll eventually have to repair it the right way.I know it sucks but thats a Jeep. (in all my years)

Posted on Feb 16, 2009

  • Frank Magliocca Feb 16, 2009

    The cleaning agent isnt the troublemaker for cooling systems,its the leak repair thats installed in the radiator & clogs up different parts of the system.Its neccesary for that in a rust situation. Dont change the oil too quickly after you add the Bars,let it circulate,find & seal the leak first.As a mechanic I have to be honest, I hate that Bars too.I like when a problem is out & out repaired. (easier said than done) Good Luck



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