cold weather startup noise

JeepinJarhead03 · **Posted:** Wed Dec 16, 2009 9:15 am

You guys jeep make a VRuummmP sound (like a quick vacuum suck almost like a raspberry fart) when ya start it up during cold weather? Hadn't noticed it until it turned colder this year and I've been so busy I have hardly driven anywhere other than to the gas station or droppin someone off at the campus much less turned a wrench

im feigning for somethin to work on

FreedomKJ · **Posted:** Wed Dec 16, 2009 5:41 pm

It's the power steering pump.

Jeep released a TSB in 2004 saying to drain and refill with ATF+4 to stop the cold weather noise.

Jeepjeepster · **Posted:** Wed Dec 16, 2009 8:21 pm

Filled mine with ATF+4.. Still makes the noise when it gets down in the 20's and teens.

Kinda hard to get all of the old fluid out though..

JeepinJarhead03 · **Posted:** Wed Dec 16, 2009 8:36 pm

makes sense, i thought it was my PS pump draggin or somethin, it's been actin weird again like it's got some air in it

first of the summer i drained what i could out of the resovoir and put some good stuff in it and it quieted down alot, guess it's time to do it again

thanks for the FYI

tjkj2002 · **Posted:** Wed Dec 16, 2009 8:47 pm

Check the pressure hose for the PS system,it likes to leak,not a bad leak but enough to let small amounts of air in that makes the pump noisy in colder temps.

JeepinJarhead03 · **Posted:** Wed Dec 16, 2009 9:21 pm

Top of the list! I think you told me to do that last time and I forgot :lol:

Wasatch15 · **Joined:** Wed Jul 13, 2005 7:52 am **Posts:** 242

That sounds like it could be the surpentine belt tensioning pulley. My 02 makes that same sound in the cold, usually for a second or so at startup.

ShafferNY · **Joined:** Wed Dec 26, 2007 3:51 pm **Posts:** 88

Mine has done that for the last two years I've owned it. It disappears after about five seconds of idling.

The colder the weather, the louder it is.

I've always considered it 'a Jeep thing'.

ChiroKJ · **Posted:** Fri Dec 18, 2009 9:21 pm

same here when its cold

kskj · **Posted:** Fri Dec 18, 2009 10:50 pm

Same Here when it gets below 10 is when it really wines until it gets warmed up.

nightdrv · **Posted:** Fri Dec 18, 2009 11:04 pm

So I don't want to threadjack, but I do have a cold-weather startup noise on mine as well. I'd rather just post it here instead of making a whole new thread for a 2 second question.

Q: When it starts, and for the first 5-6 ft of driving, I hear 6 distinct very faint thumps. 5 normal, then one louder. Mind you, these are almost impossible to hear, but I can hear everything on a car. Anyways, happens all the time (during startup driving). Any ideas?

tjkj2002 · **Posted:** Fri Dec 18, 2009 11:06 pm

nightdrv wrote:

So I don't want to threadjack, but I do have a cold-weather startup noise on mine as well. I'd rather just post it here instead of making a whole new thread for a 2 second question.

Q: When it starts, and for the first 5-6 ft of driving, I hear 6 distinct very faint thumps. 5 normal, then one louder. Mind you, these are almost impossible to hear, but I can hear everything on a car. Anyways, happens all the time (during startup driving). Any ideas?

Stop calling it a "car" and it may stop making the noise :wink:

LibertyFever · **Posted:** Sat Dec 19, 2009 10:02 am

nightdrv wrote:

So I don't want to threadjack, but I do have a cold-weather startup noise on mine as well. I'd rather just post it here instead of making a whole new thread for a 2 second question.

Q: When it starts, and for the first 5-6 ft of driving, I hear 6 distinct very faint thumps. 5 normal, then one louder. Mind you, these are almost impossible to hear, but I can hear everything on a car. Anyways, happens all the time (during startup driving). Any ideas?

I'm going to take a wild guess and say it's the tires, but only if it's been real cold overnight.

Dje Ryu · **Posted:** Sun Dec 20, 2009 1:32 pm

LibertyFever wrote:

nightdrv wrote:

So I don't want to threadjack, but I do have a cold-weather startup noise on mine as well. I'd rather just post it here instead of making a whole new thread for a 2 second question.

Q: When it starts, and for the first 5-6 ft of driving, I hear 6 distinct very faint thumps. 5 normal, then one louder. Mind you, these are almost impossible to hear, but I can hear everything on a car. Anyways, happens all the time (during startup driving). Any ideas?

I'm going to take a wild guess and say it's the tires, but only if it's been real cold overnight.

Tires might also be a little low on air but, I would think that would last more than 5-6 feet and that wouldn't explain a big thump last. Takes about a mile in my J10 to get the Swampers to be round again if it sits for more than a week.

On the original topic, my KJ also makes that raspberry fart sound for a couple seconds on startup, and my PS pump has always had ATF+4 in it. I do need to check my high pressure line, though. I have a friend here in Casper who lost all his fluid when the temp got down below zero for a few days in a row, last week. He also has an 05.

cold weather startup noise

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