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Old 11-21-2013, 07:22 PM   #1
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Chirping when cold

So my jk has about 7k on it right now and it has developed a chirp upon first starting it in the cold. A little background info first. I had taken the jeep in because the radiator hose was collapsing and i discovered what i thought was casting sand in the overflow. Tech said there was no sand in the overflow and that he looked but he wanted to order me a new rad cap to see if that would solve the hose issue. Topped off my overflow and returned a week later to have the cap put on. Everything seemed fine. Started it yesterday morning and it started chirping. Lasted a few minutes and went away when warmed up. Figured it was an isolated incident and went to work. Today it did it in the morning and as i got in to drive home. Checked the overflow and now there is nothing in the bottom of the tank. Is it possible the sand is now circulating with the working cap and wrecked hell on my pump? Im kind of lost.

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Old 11-21-2013, 08:40 PM   #2
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Bump

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Old 11-22-2013, 06:30 AM   #3
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W/O actually hearing it, I'd be willing to bet your water pump is going bad.
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Old 11-22-2013, 07:32 AM   #4
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This is it, uploaded it to youtube.
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Old 11-22-2013, 08:00 AM   #5
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My PC sucks so the video isn't much of a help for me, sorry. It could be the water pump or the belt tensioner. The fan belt could also be glazed. If you have some dielectric grease you can try this, and if the noise stops it isn't the water pump or the tensioner. Get some dielectric grease and when the engine is OFF put a blob about the size of a quarter and about 1/8" thick on the inside of the fan belt, [the grooved area], and on the outside, [the flat area]. Start it up and listen. This trick will not harm or damage the belt, and will silence a glazed belt for quite a while.
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Old 11-22-2013, 08:05 AM   #6
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Originally Posted by demarpaint View Post
My PC sucks so the video isn't much of a help for me, sorry. It could be the water pump or the belt tensioner. The fan belt could also be glazed. If you have some dielectric grease you can try this, and if the noise stops it isn't the water pump or the tensioner. Get some dielectric grease and when the engine is OFF put a blob about the size of a quarter and about 1/8" thick on the inside of the fan belt, [the grooved area], and on the outside, [the flat area]. Start it up and listen. This trick will not harm or damage the belt, and will silence a glazed belt for quite a while.
Ya know i was saying to myself its gonna be the belt it sounds so belt like. Im just having a hard time thinking the belt could fatigue that much over 7k miles. What exactly is a glazed belt never heard of it.
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Old 11-22-2013, 08:18 AM   #7
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Some of these very long belts can slip a tiny amount when the engine starts, or if you gun it getting on the highway, and develop a glaze over time. They can make a chirping sound under certain conditions or when they're damp. The dielectric grease is a way to stop it and won't dry out the belt like the spray on belt dressings will. If it quiets the noise down then it isn't the pump or a bearing in the tensioner. There should be specs in the shop manual for measuring belt deflection and to see if the tensioner is doing its job.

In the perfect world the tensioner shouldn't allow a belt to develop a glaze. But these belts have grown so long over the years that I've lost faith in the tensioners ability to take up all the slack and prevent glazing in all cases.

Knowing the history of these water pumps, yours could be on its way out to lunch too. Try the dielectric grease trick. HTH
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Old 11-22-2013, 11:13 PM   #8
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Anybody seeing antifreeze disappear in a Pentastar?

My post ^ -- you know, I didn't mention it in the post, but about two weeks ago I was working a 10 hours shift, I work out of the Jeep, and about halfway through shift I was idling while talking to someone and we were standing next to the driver's door when the Jeep started chirping. It wasn't much, just a small chirp, chirp, chirp, squeak and then quiet again. I left the Jeep on to see what would happen, it repeated this chirp about 3-5 times in 20 minutes. I then had a call and had to drive a bit, I haven't heard the chirp since then.

I did stop at the dealer though, I have an open ticket and a water pump sitting on the shelf waiting for me. I love my service dealer, they don't like to mess around it seems, I even have put off the water pump swap this week because the chirp only happened that one day and I wasn't convinced it was needed - and I'm usually pretty forward on repairs.

Now I am wondering if I'm getting a waterpump drip leak while running. It would explain the low fluid in the reservoir and the reason I never actually see a puddle. With the rain/sleet/ice we are having I won't be able to test this out for a few days though.

I also thought it could be a belt slip, and I haven't had time to look into that idea either. Your video though sounds pretty normal to me. The video I'm posting is more like wat I heard, but mine was only 4-5 cycles and then silence again, and a few minutes later another few cycles. Like I said, mine hasn't made the noise since that one span of 20 minutes that one day, so not sure.

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Old 11-22-2013, 11:17 PM   #9
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Actually - this video sounds almost exactly like what mine was doing as it stops at the 25 second mark like mine would do. But I think it sounds a bit more chirpy like the video above.

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Old 11-22-2013, 11:30 PM   #10
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Sounds like water pump to me, too. Mine was replaced around 12k miles due to that sound.
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Old 11-25-2013, 03:20 AM   #11
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^ Hi neighbor!

I'm still hoping it was a fluke, maybe just from the first cold days a few weeks ago. It hasn't come back, yet. Knock on wood of course. Mine will get tested this next weekend, I am covered in work again from Thursday to Monday, no Thanksgiving for me.
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Old 11-25-2013, 06:11 AM   #12
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Originally Posted by Lusus_Naturae View Post
^ Hi neighbor! I'm still hoping it was a fluke, maybe just from the first cold days a few weeks ago. It hasn't come back, yet. Knock on wood of course. Mine will get tested this next weekend, I am covered in work again from Thursday to Monday, no Thanksgiving for me.
Hey mine went away too! Been scratching my head lately lol i think maybe it was some coolant that had gotten on my belt from when the professionals topped off my coolant and got it all over my jeep. Probably made it squeak but fingers crossed!
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Old 11-26-2013, 08:32 PM   #13
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it sounds like the noise is under the hood but heres my twist. "chrips when cold", my blower chirps when cold, i.e. summer time with the a/c on, nothing. winter is here now. when i turn the fan on the blower chirps until engine is hot enough to blow warm air. what the heck?
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Old 11-26-2013, 09:27 PM   #14
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Originally Posted by tab22092 View Post
Hey mine went away too! Been scratching my head lately lol i think maybe it was some coolant that had gotten on my belt from when the professionals topped off my coolant and got it all over my jeep. Probably made it squeak but fingers crossed!
Interesting idea there - I had also just had mine topped up with antifreeze recently, I wonder if that could have been the reason. I will be testing this out this weekend for sure - I'm packing 40+ hours in 4 days at work.

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