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Unread 11-07-2010, 08:34 AM   #1
BillShort
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Wj If air conditioner is on should the cooling fan be on

If air conditioner is on should the cooling fan be on - If so what turns it on because mine only comes on when engine temps turns it on.

1999 Grand Cherokee Limited 4.7


Last edited by BillShort; 11-07-2010 at 06:39 PM..
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Unread 11-07-2010, 04:48 PM   #2
the88thpianoman
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As far as I know, our cooling fans are tied only to engine temp and do not stay on with ac.
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Unread 11-07-2010, 05:07 PM   #3
JForest2
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Not sure what year WJ you have but on my 03 I6, whenever I put the ac on the fan went on also...


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Unread 11-07-2010, 05:11 PM   #4
the88thpianoman
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Interesting... my 03 I6 does not...
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Unread 11-07-2010, 05:11 PM   #5
BillShort
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I have a 99 Grand Cherokee Limited 4.7. Sounds like one of you guys may have a problem.
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Unread 11-07-2010, 05:21 PM   #6
Bubba3200
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I will have to check mine....02 Overland. But the theory here should be that the fan comes on when the a/c is selected. Why?? Because the condensor has to have air across it at all times to cool the freon. Just like your home unit....when it is on the outside condensor fan should be running. If the fan is not running at stop or slow speed the a/c will not work right and a over heat condition could occur.

The hydraulic fan on mine seems to have variable speeds and it seems to adjust accordingly.
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Unread 11-07-2010, 06:04 PM   #7
ultimo
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I have both hydraulic and electrical fan, and sometimes the electrical fan does not turn on unless idling for a long time. So i guess thats ok. AS the hydraulic fan blows all the time anyways.
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Unread 11-07-2010, 06:14 PM   #8
WiCkeDuDe
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Quote:
Originally Posted by ultimo View Post
I have both hydraulic and electrical fan, and sometimes the electrical fan does not turn on unless idling for a long time. So i guess thats ok. AS the hydraulic fan blows all the time anyways.
They didnt put the hydraulic fans on the 4.0s.
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Unread 11-07-2010, 07:07 PM   #9
patrick983
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on the 4.7's the electric fan should be on with the a/c
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Unread 11-07-2010, 07:26 PM   #10
BillShort
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Ok Cool the fan should be on with AC. Mine is not coming on, what controls the fan. The fans does come on from from engine temp.

Last edited by BillShort; 11-07-2010 at 07:44 PM..
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Unread 11-07-2010, 08:32 PM   #11
ultimo
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Quote:
Originally Posted by WiCkeDuDe View Post
They didnt put the hydraulic fans on the 4.0s.
I added it in Bought the mopar part and clutch from Kolak. I believe those with the tow package came with it too
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Unread 11-08-2010, 04:49 PM   #12
BillShort
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Come on - Somebody must have the answer.
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Unread 11-08-2010, 05:03 PM   #13
cedxc2005
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Wj

Quote:
Originally Posted by Bubba3200 View Post
I will have to check mine....02 Overland. But the theory here should be that the fan comes on when the a/c is selected. Why?? Because the condensor has to have air across it at all times to cool the freon. Just like your home unit....when it is on the outside condensor fan should be running. If the fan is not running at stop or slow speed the a/c will not work right and a over heat condition could occur.

The hydraulic fan on mine seems to have variable speeds and it seems to adjust accordingly.


THIS. It is exactly as Bubba said. I have an 04 WJ I6. AC on = electric fan on (no hydraulic fan). Why? Because your AC needs air over the condenser to make cold air. Totally normal. Note that if your Jeep hasn't warmed up all the way, if you turn off the AC, the fan will go off. Theoretically, if you are moving, it should turn off as well, but I don't know if that is the case, and it's kinda hard to check...

Long story short, electric fan operation with AC on is normal. No worries.
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Unread 11-08-2010, 05:40 PM   #14
BillShort
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Ok guys i know the fan should be on when the ac is turned on. But mine does not, and causes a high pressure problem. The fan comes on when engine temp is over 215, so i know the fan works.

So what am i missing - what turns the the fan on when i press the ac button?
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Unread 11-08-2010, 06:07 PM   #15
compcrasher86
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Originally Posted by ultimo View Post
I added it in Bought the mopar part and clutch from Kolak. I believe those with the tow package came with it too
OH You're talking about the hydraulic clutch fan. Yeah, the one you tie to the waterpump pully. That comes standard on tow package 4.0s. The other guy was thinking about the main hydraulically operated fan that works off of the power steering pump that is on the 4.7 WJs instead of the electric one we have on the 4.0s
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