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Unread 04-02-2010, 05:21 PM   #1
Gnl.Weirdness
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coolant overflowing in the res...

Drove like 40 miles, engine isnt saying its more then 210, but the check engine light is on and the coolant is way over the fill line... thoughts?

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Unread 04-02-2010, 06:03 PM   #2
Gnl.Weirdness
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Its gone back down now, but given i have a 2000 head on'er wondering what others think
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Unread 04-02-2010, 06:07 PM   #3
tjwalker
It's the crank sensor!
 
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Guessing if futile.

Pull the codes and post the exact numbers here for comment. Use the technology provided to you with your OBDII system.
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Unread 04-02-2010, 06:12 PM   #4
Gnl.Weirdness
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Yeh have to grab batteries, will post em when i am back
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Unread 04-02-2010, 07:42 PM   #5
Gnl.Weirdness
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P0705

Trying to look it up on my phone
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Unread 04-02-2010, 07:48 PM   #6
carenza
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thats the code you get when the NSS is going out, Take if off, lightly sand the contacts and fill er up with di-electric grease and reassemble
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Unread 04-02-2010, 07:50 PM   #7
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NSS is what? Also would that cause oil pressure to drop a bit when going slow/stopping. Lower then the normal range that is
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Unread 04-02-2010, 09:10 PM   #8
limited
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Neutral Safety Switch. Doubtful it has anything to do with your issue.
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Unread 04-03-2010, 04:36 AM   #9
Gnl.Weirdness
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Any thoughts on the coolant issue, wicked paranoid cus it is the 00 head
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Unread 04-03-2010, 05:40 AM   #10
tjwalker
It's the crank sensor!
 
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A P0705 without any other transmission symptoms is likely the neutral safety switch, as others have mentioned. Here is a link to one of many articles going around that deal with restoring function, which is often successful.

1987-2001 Jeep Cherokees Neutral Safety Switch - Jp Magazine

As for your coolant level in the reservoir, has any cooling system work been done recently? What is the temperature of the coolant gauge in your dash running at? (should be 200-210). Know exactly where your coolant level is right now in the reservoir when hot and cold (it will vary), then watch it closely for changes.

Check oil level, condition and color of oil and look for a "milkshake" color/substance under the oil filler cap. If you see that, it's possible that you have coolant mixing with your oil.

For oil pressure, you have to look at the exact numbers. What are you seeing? The specs for oil pressure for the 4.0 are as follows. If you're in this range, you're fine.

*No less than 13 psi at hot idle
*Between 37-75 over 1600 rpms
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Unread 04-03-2010, 07:30 AM   #11
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Will check it out today and post back here
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Unread 04-04-2010, 08:06 PM   #12
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looks to be all good. Wish that write up on JP was a bit more in depth, but I guess I will just give it a shot anyway
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Unread 04-05-2010, 06:50 PM   #13
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Another thing to consider would be a compression test to rule out cooling system pressurization due to combustion gases.
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Unread 04-06-2010, 07:09 AM   #14
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yep, it's all good it was just me being paranoid for the time being cus I have already had to replace the engine once.
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