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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Wed Jun 12, 2013 6:58 am    Post subject: Wasn't sure where to post this Reply with quote

Ok guys, here's a head scratcher (maybe not).

When I first went to purchase my 2010 pathfinder, the AC wasn't blowing cold so before I purchased I had the dealership address the issue and they seemed to fix it. Actually the coldest AC I've ever had. Recently, my AC has been going from ice cold, to just blowing air. I've also noticed, that when this has occurred, my temp gauge on the gauge cluster rises to then hot line. Then returns to normal as I start driving and the air starts blowing cold. It's a pretty drastic jump, happens withing seconds.

Does anyone have an idea? I'm going to take it to an AC specialist this weekend, unless there is some fix you guys recommend.

Thanks in advance.
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doctahjones



Joined: 16 Nov 2010
Posts: 844
Location: aurora, co

PostPosted: Wed Jun 12, 2013 8:44 am    Post subject: Reply with quote

not basing this on any kind of actual experience or what not....

but i would check your engine cooling system - fans (both clutched and electric) and coolant.

i imagine that with todays ecu's, it would cut the ac compressor out if your engine was running hot. kind of like how if you go wide open throttle (wot) while the ac is on, the ecu will cut the compressor.

so, check to make sure you have plenty of coolant, and check to make sure your clutched/big/main fan seems to blow harder (can always tell by reving slightly and you'll sound like a mack truck), and check that the electric fan in front of the radiator is also kicking on.


but that's just my theory, or the hurricane did it Smile
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deermjd



Joined: 19 Jul 2010
Posts: 459
Location: Birmingham, Alabama

PostPosted: Wed Jun 12, 2013 9:44 am    Post subject: Reply with quote

For whatever reason your engine coolant system is overheating and it appears the ECU is trying to correct the problem by shutting off the AC compressor or using the heater core as a radiator to cool the engine. Of course this is purely my speculation.

So this problem only happens at idle?
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Wed Jun 12, 2013 9:53 am    Post subject: Reply with quote

No it happens at all times, appears my coolant tank is in fact empty. Grrr
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Wed Jun 12, 2013 10:27 am    Post subject: Reply with quote

Sure enough, you guys were correct! Thanks for the help. After checking the radiator cap, I discovered this:



Sure enough the rubber seal was warn, causing a leak. 5 minutes back to normal. Appreciate the help!
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doctahjones



Joined: 16 Nov 2010
Posts: 844
Location: aurora, co

PostPosted: Wed Jun 12, 2013 11:27 am    Post subject: Reply with quote

It was your execellant detailed description that help diagnose Smile
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***Traded for a 2010 QX56***
What I used to have:
'08 LE 4x4 v8 w/bully dog tuner
airraid quick fit "cold-ish" air intake
2in rancho 9000XL front / bilstein HD rear / 4x4parts.com 2in HD rear springs
airlift 1000
bfg at 285/65/18
rocky road super sliders
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Oly 22



Joined: 10 Apr 2012
Posts: 446
Location: Coquitlam, British Columbia Canada

PostPosted: Wed Jun 12, 2013 5:33 pm    Post subject: Reply with quote

My service manual says to replace the radiator cap every 48000 kms or 30000 miles. Blew past this some time ago and never thought twice about replacing the radiator cap. Guess I will now, now that I have read this.

Thanks.
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mar1
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Joined: 19 Jun 2009
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PostPosted: Mon Jun 17, 2013 12:15 pm    Post subject: Reply with quote

make sure you burp it! not extremely important, but better..
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Tue Jun 18, 2013 5:34 am    Post subject: Reply with quote

Ok guys, apparently that didn't fix it, now what to do?
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Joined: 13 Aug 2008
Posts: 2759
Location: Winnipeg, Canada

PostPosted: Tue Jun 18, 2013 6:48 am    Post subject: Reply with quote

Is your fan clutch working properly?
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Tue Jun 18, 2013 7:27 am    Post subject: Reply with quote

The man fan is running, the actually housing of the fan looks beat up though. When I get home from work I will try to get under there and take some pictures.
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Location: Winnipeg, Canada

PostPosted: Tue Jun 18, 2013 7:30 am    Post subject: Reply with quote

You could check to make sure the fan is not damaged.

Also, you could check to see if you rad and condensor cores are plugged with dirt.

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Tue Jun 18, 2013 7:46 am    Post subject: Reply with quote

I almost feel there is a leak somewhere, because it seems the coolant levels are low for just filling it last week. I just don't see any abnormal fluid on the ground when parked.
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PostPosted: Tue Jun 18, 2013 7:57 am    Post subject: Reply with quote

You could do a pressure test... and a visual inspection of your rear heater lines.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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FLpathFinder



Joined: 29 Mar 2013
Posts: 74

PostPosted: Tue Jun 18, 2013 8:45 am    Post subject: Reply with quote

I wish I knew what that meant lol, I'm not the handiest when it comes to cars. But the fan is spinning, just popped the hood and checked.

I guess I will take it to nissan :/
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