Odd Whistle in car

Nasher · 26th September 2018, 10:05

Hi all,
An odd one this.
I've got an 04 75 connie 2.0 CDTi (mileage 178000) and when I switch on the engine I often get a whistle in the car similar to a wolf whistle. It only lasts a few seconds and then disappears. If I'm in slow moving traffic or stationary at traffic lights it often whistles again. Sometimes the whistle seems associated with a louder engine tick over.
I have no idea of where the whistle comes from but it sounds more as if it comes from within the car and not the engine compartment.
The car runs well but if in a queue of traffic the engine hunts a bit.
I'm worried that something is going wrong but I haven't got a clue as to what it is.

I've searched on the site and can't see anything similar.
Anyone got any ideas as to what it might be so i can rectify it.

Cheers,
Nasher

suzublu · 26th September 2018, 10:22

Does it sound like a whale whoop? If so, aircon related

phatfiesta75 · 26th September 2018, 22:44

Quote:

Originally Posted by suzublu

Does it sound like a whale whoop? If so, aircon related

Have that issue with mine if I don't have econ on.

Nasher · 28th September 2018, 20:10

Yes, a whalw whoop is a good description.
I'm sure I need the air con re gassing as during the very hot weather the air con struggled to cool the car down and if I put it on at 18 C or lower it just seemed to blow warm air. If I set it around 20 the car slowly cooled.
If it is air con related how do I cure it.
Thanks for any suggestions.

BigRuss · 28th September 2018, 20:30

If your cooling fan isn't working it will whoop when you're stationary

Russ

Nasher · 2nd October 2018, 20:36

Thanks.
Cooling fan definitely working and oddly I've not heard the noise for over a week now.
Cheers.

T-Cut · 3rd October 2018, 10:30

Apart from insufficient refrigerant (gas) and loss of the low speed fan cooling, this effect is commonly due to the condenser losing too much of the cooling fins.

That famous foto once again:

TC

26th September 2018, 10:05	#1
Nasher Regular poster Rover 75 Saloon Join Date: Jul 2013 Location: Little Paxton Posts: 34 Thanks: 1 Thanked 2 Times in 1 Post	Odd Whistle in car Hi all, An odd one this. I've got an 04 75 connie 2.0 CDTi (mileage 178000) and when I switch on the engine I often get a whistle in the car similar to a wolf whistle. It only lasts a few seconds and then disappears. If I'm in slow moving traffic or stationary at traffic lights it often whistles again. Sometimes the whistle seems associated with a louder engine tick over. I have no idea of where the whistle comes from but it sounds more as if it comes from within the car and not the engine compartment. The car runs well but if in a queue of traffic the engine hunts a bit. I'm worried that something is going wrong but I haven't got a clue as to what it is. I've searched on the site and can't see anything similar. Anyone got any ideas as to what it might be so i can rectify it. Cheers, Nasher

28th September 2018, 20:30	#5
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	If your cooling fan isn't working it will whoop when you're stationary Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

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26th September 2018, 10:22	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,911 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Does it sound like a whale whoop? If so, aircon related

28th September 2018, 20:10	#4
Nasher Regular poster Rover 75 Saloon Join Date: Jul 2013 Location: Little Paxton Posts: 34 Thanks: 1 Thanked 2 Times in 1 Post	Yes, a whalw whoop is a good description. I'm sure I need the air con re gassing as during the very hot weather the air con struggled to cool the car down and if I put it on at 18 C or lower it just seemed to blow warm air. If I set it around 20 the car slowly cooled. If it is air con related how do I cure it. Thanks for any suggestions.

2nd October 2018, 20:36	#6
Nasher Regular poster Rover 75 Saloon Join Date: Jul 2013 Location: Little Paxton Posts: 34 Thanks: 1 Thanked 2 Times in 1 Post	Thanks. Cooling fan definitely working and oddly I've not heard the noise for over a week now. Cheers.

3rd October 2018, 10:30	#7
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,751 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Apart from insufficient refrigerant (gas) and loss of the low speed fan cooling, this effect is commonly due to the condenser losing too much of the cooling fins. That famous foto once again: TC