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Old 07-16-2011, 11:36 PM   #1
superchevything
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Default Radiator fan issue

My radiator fans keep cutting on and off and its causing a overheating issue does any body knows what could be the issue??
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Old 07-17-2011, 07:46 AM   #2
MalibuKen
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Default Re: Radiator fan issue

Quote:
Originally Posted by superchevything View Post
My radiator fans keep cutting on and off and its causing a overheating issue does any body knows what could be the issue??
The overheating likely is not being CAUSED by the fans but them going on and off is a symptom rather than a cause. They are not supposed to run all the time, except when the AC is on.

If you turn on the AC, do the fans run continuously ?
If so, then the fans themselves likely is NOT the problem.

There could be several causes, the most simple is a leak and low coolant level.

How do you know it is "overheating" ? Does the temp gauge get up near the RED area ??
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Old 07-17-2011, 09:54 AM   #3
Beatdown Z
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Default Re: Radiator fan issue

Describe the problem in more detail. My [sister's] Malibu was overheating because the fans weren't coming on at all. I have HP Tuners software, so I used that to disable the Climate Control Override for the fans and now they work. I have them set kind of low in the summer to bring them on sooner for the AC, because like I said above, they can no longer be controlled by the AC.
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Old 07-18-2011, 09:26 PM   #4
superchevything
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Default Re: Radiator fan issue

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Originally Posted by MalibuKen View Post
The overheating likely is not being CAUSED by the fans but them going on and off is a symptom rather than a cause. They are not supposed to run all the time, except when the AC is on.

If you turn on the AC, do the fans run continuously ?
If so, then the fans themselves likely is NOT the problem.

There could be several causes, the most simple is a leak and low coolant level.

How do you know it is "overheating" ? Does the temp gauge get up near the RED area ??


I notice the needle passing the 210 mark when i turned off the AC and when i left the car parked i popped the hood and notice the fans where not spinning.
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Old 07-19-2011, 07:49 AM   #5
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Default Re: Radiator fan issue

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Originally Posted by superchevything View Post
I notice the needle passing the 210 mark when i turned off the AC and when i left the car parked i popped the hood and notice the fans where not spinning.
The first part probably indicates a problem.

The second part, probably not. I don't think modern cooling designs include running the fans when the engine is off anymore.

Since damn near EVERYTHING on these beasts is controlled through one (or more) of the computer modules, I assume that the cooling is too.......and unless the pressure cap is bad or there is an obvious leak, there probably isn't much you can do to fix it.

In the meantime, just keep the AC on.
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Old 07-19-2011, 09:31 PM   #6
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Default Re: Radiator fan issue

Quote:
Originally Posted by superchevything View Post
I notice the needle passing the 210 mark when i turned off the AC and when i left the car parked i popped the hood and notice the fans where not spinning.
I noticed that also, and took my 'Bu in (about eight years ago!) for that.

Turns out the turn on is about 210 by the PCM's computer, and the gauge ... is not really that accurate.

Unless you've added a third-party gauge, then yah, you may need to be worried.

I'd also "burp" the air out to make sure there's no air bubbles in the cooling system (that's what that little plug on the coolant crossover pipe on the 3.1L is for.)

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Old 07-20-2011, 10:06 AM   #7
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Default Re: Radiator fan issue

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Originally Posted by RalphP View Post
Unless you've added a third-party gauge, then yah, you may need to be worried.
I think that's one reason why they stopped putting temp. markings on the gauge.

Wouldn't it depend on how MUCH above 210 it went, how long it stayed there and how much it goes up and down ?

I don't remember the last vehicle that I owned where the temp indicator moved more than a needles width or so once it was warmed up good.......in most any conditons.
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Old 07-23-2011, 06:31 AM   #8
Beatdown Z
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Default Re: Radiator fan issue

My '01 Malibu had the first fan set to come on at 223* and the second to come on at 232*...
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