Paranoid about Oil Cooler Line failure! - Chevy Colorado & GMC Canyon
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post #1 of 66 (permalink) Old 03-02-2018, 11:39 AM Thread Starter
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Paranoid about Oil Cooler Line failure!

Well, I have read another alarming post yesterday about one of you that huts had another oil cooler line failure. This morning, I thought that I would put the Oil Pressure monitor up on the DIC while driving and watch it. The guy that had the failure yesterday said his oil pressure went from 70 to 20 psi in minutes. I started driving and pressure got up to 88 psi, and at a light went to 17 psi. Do any others see anything like this? First of all, 88 psi seems rather high and 17 psi sitting at a light seems awfully low. I am a little concerned. Also, by doing research, looks like the part numbers have been changed for the cooler lines to 84058586 and 84058587. Hopefully these are upgraded. Thinking about putting a hose clamp around the aluminum crimp fitting just as insurance in case the crimp tries to split, like some of the pictures that I have seen. At least if the fitting split, the hose clamp would put enough pressure to keep the rubber hose from blowing off and separating. What do you think?

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post #2 of 66 (permalink) Old 03-02-2018, 12:06 PM
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I notice you are in Spring, TX. I'm in Katy.

I think most of the line failures have occurred in Canada and northern states, so it's probably temperature related.

I checked my cooler lines the other night and they looked dry and tight. The oil pressure in the teens still perplexes me though. I've never seen a pressure below 30 in my truck. Mine is a 2017 Z71 with the 3.6L (LGZ), 4200 miles and 5W30 oil.

I don't think it would hurt to put small hose clamps on the crimps. Don't over tighten clamps, otherwise you might hurt the original crimp/collar.
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post #3 of 66 (permalink) Old 03-02-2018, 12:12 PM
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low oil pressure at idle isnt really that concerning. constant oil pressure would be concerning.

As for the lines: if you're worried about them replace them. They're not difficult to access or swap out. If you do your own oil changes just do it when you change your truck's oil. A little research will tell you what to get.

However, more than likely this is just masturbation. Naturally people are going to post about their issues so you're going to read about it. How many people are going to post up:
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I went out to my truck today and it started up right away. I just had to turn the key. Drove it to work and nothing happened. Is there something I can do to make it break or sound strage? I'm getting bored with it working nicely.
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post #4 of 66 (permalink) Old 03-02-2018, 12:17 PM
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My oil pressure on my 2017 3.6L LGZ after warm up usually runs in the 30-33psi range at idle and 44 - 46psi to maybe 52psi while driving. I have never seen anywhere near 80psi. Years ago, 60 psi was high.

But now I'm paranoid also.
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post #5 of 66 (permalink) Old 03-02-2018, 12:53 PM Thread Starter
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Not stated in original post. 2016 3.6L LFX. To me 88 is too high and 17 idling in gear is too low.
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post #6 of 66 (permalink) Old 03-02-2018, 01:27 PM
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Originally Posted by 16WhiteColly View Post
Well, I have read another alarming post yesterday about one of you that huts had another oil cooler line failure. This morning, I thought that I would put the Oil Pressure monitor up on the DIC while driving and watch it. The guy that had the failure yesterday said his oil pressure went from 70 to 20 psi in minutes. I started driving and pressure got up to 88 psi, and at a light went to 17 psi. Do any others see anything like this? First of all, 88 psi seems rather high and 17 psi sitting at a light seems awfully low. I am a little concerned. Also, by doing research, looks like the part numbers have been changed for the cooler lines to 84058586 and 84058587. Hopefully these are upgraded. Thinking about putting a hose clamp around the aluminum crimp fitting just as insurance in case the crimp tries to split, like some of the pictures that I have seen. At least if the fitting split, the hose clamp would put enough pressure to keep the rubber hose from blowing off and separating. What do you think?
When cold my oil pressure will go to 87 at about 1500 RPM and above. At idle when cold its in the 20s. When it warms up it won't go that high. There was a post just the other day about those pressures and from reading that one it seems perfectly normal. I think you are worrying too much really.

You can put a clamp over the collar and tighten the crap out of it, it wont hurt it. Is that what happens, the crimp splits open? That is very odd, a defective part for sure. Usually the hose fails from age. Where did you see a picture of it?

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post #7 of 66 (permalink) Old 03-02-2018, 02:13 PM
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Originally Posted by DargelJohn View Post
I notice you are in Spring, TX. I'm in Katy.

I think most of the line failures have occurred in Canada and northern states, so it's probably temperature related.


I don't think it would hurt to put small hose clamps on the crimps. Don't over tighten clamps, otherwise you might hurt the original crimp/collar.

How about salt related corrosion. If the tubing is steel and the collar is aluminum, the 2 don't go well together in the presence of road salt !
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post #8 of 66 (permalink) Old 03-02-2018, 02:53 PM
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How about salt related corrosion. If the tubing is steel and the collar is aluminum, the 2 don't go well together in the presence of road salt !
I believe the tubing and collar are aluminum. Good point though...
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post #9 of 66 (permalink) Old 03-02-2018, 04:35 PM
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does anyone have a picture of where i should be looking to inspect this? I've asked three times... no one answers me. :(
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post #10 of 66 (permalink) Old 03-02-2018, 04:52 PM
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does anyone have a picture of where i should be looking to inspect this? I've asked three times... no one answers me. :(

I have asked also. It seems the ones who have had it happen are new here, have made 2 to 7 posts, complain of the hose breaking, state they had it towed, and then maybe return to say "All repaired ! " Not car or truck guys I guess. Don't know what the point is of posting an issue and then not providing any details. Other than the first one that occurred way back in 2015 and it was only a picture of an oil puddle/spray under the truck. Not which hose or where if failed.

Annoying and kind of self serving of them isn't it. . .
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post #11 of 66 (permalink) Old 03-02-2018, 07:00 PM
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Ok. . refining my previous post earlier about oil pressure. Not much different than what I stated.

Upon a cold start. . . truck sat for 2 days . . 40F and start up pressure read 56psi. IT remained in the mid 50psi range for about the first 5 minutes of driving then started to drop down and settled at 45 to 46psi. We drove to a restaurant about 10 miles away partly on the interstate. Even at speeds of 60 to 75MPH (1,400 to 1800RPM) the oil pressure hovered at 45 to 46psi.
When we came back, I kicked it down on an entrance ramp (3,000RPM or so) and oil pressure went to 60psi until I reached 75MPH. IT then settled back to 44 to 46psi.
I know I have seen it down to 33 or 34psi at idle in warmer weather or on a longer run time than 10 miles would amount to.

Wondering if the fellows in Canada had their hose incidents in really cold weather and using what kind of oil?

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post #12 of 66 (permalink) Old 03-02-2018, 08:22 PM
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Originally Posted by GraniteBlue05 View Post
Ok. . refining my previous post earlier about oil pressure. Not much different than what I stated.

Upon a cold start. . . truck sat for 2 days . . 40F and start up pressure read 56psi. IT remained in the mid 50psi range for about the first 5 minutes of driving then started to drop down and settled at 45 to 46psi. We drove to a restaurant about 10 miles away partly on the interstate. Even at speeds of 60 to 75MPH (1,400 to 1800RPM) the oil pressure hovered at 45 to 46psi.
When we came back, I kicked it down on an entrance ramp (3,000RPM or so) and oil pressure went to 60psi until I reached 75MPH. IT then settled back to 44 to 46psi.
I know I have seen it down to 33 or 34psi at idle in warmer weather or on a longer run time than 10 miles would amount to.

Wondering if the fellows in Canada had their hose incidents in really cold weather and using what kind of oil?
could be the cold/higher pressure causing it but still it should not do this. I don't care if it is -50 with 20-50 oil, it shouldn't blow a hose open. It has to be a defect. :(
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post #13 of 66 (permalink) Old 03-02-2018, 08:26 PM
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could be the cold/higher pressure causing it but still it should not do this. I don't care if it is -50 with 20-50 oil, it shouldn't blow a hose open. It has to be a defect. :(
I don't disagree. Just saying the cold and thicker oil may have shown the problem up. . . .. right? I never implied that the hose wasn't at fault.
People infer a lot of things. . . .
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post #14 of 66 (permalink) Old 03-02-2018, 08:31 PM
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I've noticed my oil pressure reading in the 15-17 range when at a stop. I checked my oil the other day and it was a fine level, but is very black and seemed thin. My DIC reads 35% on the oil life, certainly will be getting in for a change soon.
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post #15 of 66 (permalink) Old 03-02-2018, 08:38 PM
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I think the high oil pressures after warm up are when the cam phasing is occurring. The 3.6 uses the motor oil to make the variable valve timing work that is why it takes so much oil for such a small motor. I read it somewhere on here, but would just butcher it trying to explain it. The cam phasing is way beyond the technolgy from back when I was taught to fix what I break.
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post #16 of 66 (permalink) Old 03-02-2018, 08:39 PM
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I don't disagree. Just saying the cold and thicker oil may have shown the problem up. . . .. right? I never implied that the hose wasn't at fault.
People infer a lot of things. . . .
yep. :) my post wasn't really directed at you per say, just throwing some info out there just in case.

you know, seems about the high 80s is the highest psi reported here so far. That really isn't THAT much pressure. Still want to see the pic of this hose/line failure. I searched for one never found it. What is scary is it seems like there is really no warning, like it just blows?
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post #17 of 66 (permalink) Old 03-02-2018, 08:45 PM
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yep. :) my post wasn't really directed at you per say, just throwing some info out there just in case.

you know, seems about the high 80s is the highest psi reported here so far. That really isn't THAT much pressure. Still want to see the pic of this hose/line failure. I searched for one never found it. What is scary is it seems like there is really no warning, like it just blows?

Exactly.. . I'm not sure looking even every day would reveal any seepage or leaks. These type of crimp oil line connections seem to work fine on most vehicles and then, every now and then on Chevy trucks they have failures. One guy in another thread said on a previous older truck prone to this same kind of failure, that he cut off the outer aluminum crimped part and installed regular hose clamps to maintain the connection.
Not sure i want to do that on a year old truck. . . . And, why should I have to?
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post #18 of 66 (permalink) Old 03-02-2018, 09:02 PM
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Originally Posted by GraniteBlue05 View Post
Exactly.. . I'm not sure looking even every day would reveal any seepage or leaks. These type of crimp oil line connections seem to work fine on most vehicles and then, every now and then on Chevy trucks they have failures. One guy in another thread said on a previous older truck prone to this same kind of failure, that he cut off the outer aluminum crimped part and installed regular hose clamps to maintain the connection.
Not sure i want to do that on a year old truck. . . . And, why should I have to?
so does the hose blow off the line like the crimp isn't tight enough? Or someone said the crimp splits? Can't imagine the crimp would split, that is crazy. Either way that really sucks.

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post #19 of 66 (permalink) Old 03-03-2018, 01:28 AM
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I'm no help as I didn't get to look today. If I can figure out where to look I'll try to post a pic.

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post #20 of 66 (permalink) Old 03-03-2018, 11:36 AM
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I certainly appreciate folks posting about their issues..... Granted - I don't appreciate the actual issues (for any of us). I think we all like to stay 'ON TOP' of things and know what we may expect.

Even after knowing of these potential problems - they still might leave us 'sit' and require a tow. So be it...... We should all pay attention to these things and at least know what your PSI is during normal day to day driving. Comparing with each other is a good thing!


I'm curious....is that part of the 'Power Train' 5 year warranty? Or no....?

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