Is this normal for automatics?

Chris K · 16th August 2009, 09:53

Just got another 75 1.8T 'automatic' this time

Love the car but just wondering

On my old manual box, when aircon was on, the cooling fan used to growl for a few seconds after the car was turned off - but this only happened when the air con was on - never did it in 'eco' mode

On this automatic I notice the fan keeps growling for a while whether the aircon is on or off ('Eco' mode) - the temperature guage is reading normal (halfway)

Is this normal for automatics?

James.uk · 16th August 2009, 14:03

It is not gear box related. If the engine is hot enough then the fan runs on to get rid of latent heat once the engine stops..

.

SD1too · 17th August 2009, 08:26

Chris,

When the air conditioning is activated (i.e. the 'Auto' button is pressed) your engine cooling fan should run continuously. This is to maintain a flow of air over the condenser at low road speeds.

As our temperature gauges read 'normal' (i.e. the half-way position) when the coolant temperature is anywhere between 75 and 115 degrees C, they are virtually useless! So forget about the temperature gauge. As James.uk says, if the fan has already been triggered by high coolant temperature, it will continue to run for a few minutes after the engine has been stopped.

But you are, in fact, correct to suggest that automatic transmission can affect fan performance. When the fluid temperature reaches a certain value, the engine fan is triggered to provide airflow over the ATF cooler.

I'm a bit concerned that your fan 'growls'. It should sound like a hair dryer, but at a lower frequency. I hope that your fan motor bearings are o.k.

Does this help?

Simon.

Chris K · 17th August 2009, 16:43

'growling' is a bit of an exageration - just regular cooling fan noise vs no noise at all

)

16th August 2009, 09:53	#1
Chris K Loves to post Rover 75 CDT Conn SE Saloon Automatic Gold 68K Join Date: Aug 2009 Location: Loughborough, Leics Posts: 350 Thanks: 9 Thanked 0 Times in 0 Posts	Is this normal for automatics? Just got another 75 1.8T 'automatic' this time Love the car but just wondering On my old manual box, when aircon was on, the cooling fan used to growl for a few seconds after the car was turned off - but this only happened when the air con was on - never did it in 'eco' mode On this automatic I notice the fan keeps growling for a while whether the aircon is on or off ('Eco' mode) - the temperature guage is reading normal (halfway) Is this normal for automatics?

17th August 2009, 08:26	#3
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,498 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Chris, When the air conditioning is activated (i.e. the 'Auto' button is pressed) your engine cooling fan should run continuously. This is to maintain a flow of air over the condenser at low road speeds. As our temperature gauges read 'normal' (i.e. the half-way position) when the coolant temperature is anywhere between 75 and 115 degrees C, they are virtually useless! So forget about the temperature gauge. As James.uk says, if the fan has already been triggered by high coolant temperature, it will continue to run for a few minutes after the engine has been stopped. But you are, in fact, correct to suggest that automatic transmission can affect fan performance. When the fluid temperature reaches a certain value, the engine fan is triggered to provide airflow over the ATF cooler. I'm a bit concerned that your fan 'growls'. It should sound like a hair dryer, but at a lower frequency. I hope that your fan motor bearings are o.k. Does this help? Simon. __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

16th August 2009, 14:03	#2
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	It is not gear box related. If the engine is hot enough then the fan runs on to get rid of latent heat once the engine stops.. .

17th August 2009, 16:43	#4
Chris K Loves to post Rover 75 CDT Conn SE Saloon Automatic Gold 68K Join Date: Aug 2009 Location: Loughborough, Leics Posts: 350 Thanks: 9 Thanked 0 Times in 0 Posts	'growling' is a bit of an exageration - just regular cooling fan noise vs no noise at all )