Patrol Air Con

Submitted: Saturday, Apr 22, 2006 at 04:53
ThreadID: 33139 Views:1346 Replies:6 FollowUps:9
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Hi All,
Just a quick question about the aircon on a 3.0 Gu 2005. I had the air con on today for the first time, thats the UK for you. Anyway when the car was standing still i noticed the engine note changing every 30 seconds approx. The temp gauge never moved, is this normal, at speed i notice nothing.

Thanks

Scott
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Reply By: Member - Bware (Tweed Valley) - Saturday, Apr 22, 2006 at 05:19

Saturday, Apr 22, 2006 at 05:19
Hi Scott
I'm no expert and I'm sure others can give more detail, facts and figures. But, something I've learned from this forum is that your standard temp guage only registers extremes ie when you first start it the needle points to cold. Once it reaches running temp the needle doesn't move much. But while you are driving the temp is changing but the needle wont rise unless the temps start to really risewhen the engine is under stress like towing uphill.
So perhaps the engine note is the fan cutting in when you're standing still with the a/c on and no airflow through the radiator? Best get a 2nd opinion though ;)
AnswerID: 168426

Follow Up By: scottcamp - Saturday, Apr 22, 2006 at 05:24

Saturday, Apr 22, 2006 at 05:24
Hi Bware,

I think you are right about the fan cutting in, but my main concern is the frequency of it. When the air con is off the fan never cuts in, maybe this is normal but better to check.

Scott
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FollowupID: 423741

Follow Up By: Member - Bware (Tweed Valley) - Saturday, Apr 22, 2006 at 05:35

Saturday, Apr 22, 2006 at 05:35
Always better to check when it involves something you've spent a few quid on! If you don't get many replies try a search on your vehicle and over-heating problems; I don't know if it is your model but there is quite a few posts about over-heating Nissans.
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Follow Up By: scottcamp - Saturday, Apr 22, 2006 at 05:51

Saturday, Apr 22, 2006 at 05:51
Hi Bware,
I am 100% certain it is not over heating as when i lift the bonnet there is hardly any heat. I am almost certain that putting the aircon on does something to the cut-in point of the fans but it just seems too frequent?

Out of interest, what time is it where you are, is it not very early?

Scott
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FollowupID: 423743

Follow Up By: scottcamp - Saturday, Apr 22, 2006 at 05:55

Saturday, Apr 22, 2006 at 05:55
Hi bware,

Nothing to do with the post but just noticed we are drinking a bottle of Australian wine right now, very nice. Its called four emus from south australia, mmm very nice.

Scott
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FollowupID: 423744

Follow Up By: Member - Bware (Tweed Valley) - Saturday, Apr 22, 2006 at 12:44

Saturday, Apr 22, 2006 at 12:44
Hi Scott, it was early, about 5.30 am; had a very late night at work. Went to bed after my last follow-up.
Glad to see you've received better info from others.
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FollowupID: 423779

Reply By: fisho64 - Saturday, Apr 22, 2006 at 06:38

Saturday, Apr 22, 2006 at 06:38
Its just the compressor cutting in and out. Perfectly normal. Most cars the engine fan starts automatically when the AC is turned on whatev er the temp. Look under the bonnet and you will see the compressor staring and stopping.
AnswerID: 168427

Follow Up By: scottcamp - Saturday, Apr 22, 2006 at 07:00

Saturday, Apr 22, 2006 at 07:00
Hi Fisho,
Thanks for the info. But that raises one more question, my wifes car has aircon, a small Vauxhall Meriva and i do not hear that compressor cutting in and out. Is there differences between cars?

Thanks

Scott
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FollowupID: 423746

Follow Up By: fisho64 - Saturday, Apr 22, 2006 at 08:00

Saturday, Apr 22, 2006 at 08:00
All have basically the same system but some are more/less powerful than others. Like a fridge, one with poor insulation or door open often may be running all the time. One that is closed and in a cool area etc may cut in til it reaches a certain point then stop.
Merely start the engine, turn on AC then open bonnet and watch the centre of the AC compressor. You should see it spinning after it clicks on. If the AC isnt running the pully will be turning but the centre not
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FollowupID: 423750

Follow Up By: Member - Stephen M (NSW) - Saturday, Apr 22, 2006 at 21:43

Saturday, Apr 22, 2006 at 21:43
Hi there Scottcamp as said by every one else this is perfectly normal nothing to worry about. In regards to your wifes car it might be like my commodore where as the compressor does not cut out nor do the fans stop while ever the air con switch is turned on.This is normal for all vt 1997, vx commodores and upwards on the v6's not sure about the v8's.They have some form of internal vavle to stop it from freezing up in the evaporator box under the dashboard,either that or your wifes car is low on gas there fore not getting down cold enough to cut compressor out all though I dought that where you are. Regards Steve M
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Follow Up By: fisho64 - Saturday, Apr 22, 2006 at 22:21

Saturday, Apr 22, 2006 at 22:21
low gas would cause it to short cycle more not less
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FollowupID: 423856

Reply By: Member - Troll 81 (QLD) - Saturday, Apr 22, 2006 at 08:04

Saturday, Apr 22, 2006 at 08:04
Mine does the same thing it's just the compressor turning on and off, nothing to worry about
AnswerID: 168434

Reply By: rob1 - Saturday, Apr 22, 2006 at 08:40

Saturday, Apr 22, 2006 at 08:40
As the air-con compressor comes on, it produces more loasd on the engine. To compensate for this the engine revs are increased via a " fast idle solenoid " or similar. as the compressor switches off, the engine revs are again reduced. You don't notice anything at speed because the engine revs are high and can easily run the compressor. Perfectly normal.

Rob
AnswerID: 168441

Reply By: rickwagupatrol - Saturday, Apr 22, 2006 at 12:56

Saturday, Apr 22, 2006 at 12:56
Basically, its just the compressor and the fan cutting in and out. Idle the car withthe a/c on, open the bonnet and find the a/c fittings that they use to do a regas. Hold your hand there and you will quickly feel a rise in temp in the pipes, then the fan will cut in and things will cool down again. Its only because there is no air flow through the radiator to cool the moving gas.
there is nothing to worry about at all.

rick.
AnswerID: 168453

Reply By: scottcamp - Sunday, Apr 23, 2006 at 02:27

Sunday, Apr 23, 2006 at 02:27
Hi Guys,

Thanks for all the advice, it has put my mind at rest. I think it is just the reputation of the 3.0 that you look for faults.

Cheers

Scott
AnswerID: 168527

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