Fear overheating the 4.7HO. Losing coolant. - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Fear overheating the 4.7HO. Losing coolant.

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Unread 09-15-2013, 08:45 PM   #1
JayIV
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2004 WJ 
 
Join Date: Oct 2004
Location: Deland, FL
Posts: 2,483
Wj Fear overheating the 4.7HO. Losing coolant.

I'm concerned about some unusual temp activity in my Overland. It's never gone above 210* but I'm concerned because it also seems to be losing coolant.

It usually hovers on the tick mark just to the left of the 210* mark when the coolant reservoir is full, whether I'm on the highway or in the city. I'm pretty comfortable with this temp.

However, if I notice the coolant reservoir getting a little empty, the temp will hit 210* on the highway. Once back in city traffic, it will retreat a little bit to halfway between 210* and the tick to the left.

I never see any drips on the ground below the WJ. However, I sometimes notice coolant just below the pulley of the crankshaft. Checked the waterpump weep hole and it's fine. Water pump is not factory, so it's been replaced by a PO. The radiator also seems to be aftermarket. There's no oil in the coolant.

Any ideas? I would sincerely appreciate it.

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Unread 09-15-2013, 10:35 PM   #2
Olese
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Still sounds like a water pump if coolant is below the front pulley. Can you pressurize the system and watch for the drip? How often do you have to add to the reservoir? How many miles? Has it ever been overheated? Do you see any steam (white smoke) coming from the exhaust?
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Unread 09-16-2013, 05:24 AM   #3
Duh
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The seals behind the pully leak on occasion to on the pump. See if you can rent a pressure tester from a local parts store. They arent that expensive to buy either, the dreaded harbor freight might even carry one that will work for at least your purpose. You could do a block test if you were worried about the head gaskets-but they arent 100%.
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Unread 09-16-2013, 05:26 AM   #4
Duh
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Also, the timing covers are known to develope issues, cracks and rotted areas that can leak too. Normally around the water pump area.
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Unread 09-16-2013, 09:05 AM   #5
JayIV
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I don't drive it very frequently but I usually have to add coolant about once every two or three weeks. I'm usually working on it that often and I check the reservoir. It's not empty but it's usually much lower than were I left it last.

120,000 miles. Never been overheated to my knowledge but it's a new to me vehicle. Had it about two months now. Very rarely do I see any white smoke coming from the exhaust- about as frequently as I saw it from my last WJ with no known issues. I wouldn't even consider it smoke or steam to be honest, more like fragrant vapor.

I could pressurize the system by bringing it up to temp and watching. I'll report back afterwards.

Again, I'm seeing the leaks below the crankshaft pulley, not below the water pump pulley (I realize they are above one another).

Could either of you link me to the timing cover issues?
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Unread 09-16-2013, 09:21 AM   #6
Jeeples
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Another common place to slowly lose coolant is the thermostat housing on the lower radiator hose. Its a plastic piece that tends to develop cracks around the bolt holes.
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Unread 09-16-2013, 09:57 AM   #7
JayIV
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Is it possible for that to trickle down to the location I've mentioned above? I thought they were parallel.
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Unread 09-16-2013, 10:15 AM   #8
JayIV
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It would be a bummer if I had to replace the timing cover but I would prefer to address it prior to overheating. I've found the set which seems to fit my 2004 Overland here, http://www.factorychryslerparts.com/...5134142AF.html

Is there anywhere else I can find the cover if I need it?
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