Help please air con fan cutting out.....

smiggy7777®© · Jul 6th, 2009, 17:51

Hello every one.

I have recently brought an 850R and am having some probs with the heater/air con fan.

If the engine is off the heater fan works on all speeds and dose not cut out but with the engine on as soon as i take it by half way 5 secs later it cuts out and will not start again until you switch the engine off.

Even when it is on low it blows warm.

Any ideas ?????

Regards

Smiggy

v70x · Jul 6th, 2009, 18:07

I am sure other people may have ideas but it could be the fan motor resistor had an omega that played up and advised that could be the problem though never got round to doing it. do you have full climate or just a/c and standard heater.

full climate could bring other possible faults.

smiggy7777®© · Jul 6th, 2009, 18:31

It has manual dials not digital so i guess its not climate ???

Chris_Rogers · Jul 6th, 2009, 19:45

If it has an auto positon on the fan switch it be Electronic Climate Control (ECC). I expect all 'R' models have it.

I suspect the problem is parially seized fan bearings, the only realistic cure is a replacement fan.

smiggy7777®© · Jul 8th, 2009, 14:20

It has got the auto switch and im guessing that if it was a problem with the fan itself then it would do the same when the engine isnt running? but it seems to work fine when the engine isnt running

Chris_Rogers · Jul 8th, 2009, 22:09

Hmm.

It maybe that without the engine running the battery volts are lower and consequently the running current of the fan is just below the level that causes a protective shutdown by the fan speed control unit. Once the engine is running and the battery volts and fan current are increased the shutdown is initiated. Best to measure the fan current and read the ECC fault codes for a better diagnosis.

Jul 6th, 2009, 17:51	#1
smiggy7777®© Volvo 850R 308BHP Last Online: May 16th, 2014 10:14 Join Date: Jul 2009 Location: Leicester	Help please air con fan cutting out..... Hello every one. I have recently brought an 850R and am having some probs with the heater/air con fan. If the engine is off the heater fan works on all speeds and dose not cut out but with the engine on as soon as i take it by half way 5 secs later it cuts out and will not start again until you switch the engine off. Even when it is on low it blows warm. Any ideas ????? Regards Smiggy

Jul 6th, 2009, 18:07	#2
v70x VOC Member Last Online: Aug 23rd, 2015 11:53 Join Date: May 2007 Location: Spalding lincs	I am sure other people may have ideas but it could be the fan motor resistor had an omega that played up and advised that could be the problem though never got round to doing it. do you have full climate or just a/c and standard heater. full climate could bring other possible faults. __________________ V70 T5 SE Ash Gold. club member.

Jul 6th, 2009, 18:31	#3
smiggy7777®© Volvo 850R 308BHP Last Online: May 16th, 2014 10:14 Join Date: Jul 2009 Location: Leicester	It has manual dials not digital so i guess its not climate ???

Jul 6th, 2009, 19:45	#4
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	If it has an auto positon on the fan switch it be Electronic Climate Control (ECC). I expect all 'R' models have it. I suspect the problem is parially seized fan bearings, the only realistic cure is a replacement fan.

Jul 8th, 2009, 14:20	#5
smiggy7777®© Volvo 850R 308BHP Last Online: May 16th, 2014 10:14 Join Date: Jul 2009 Location: Leicester	It has got the auto switch and im guessing that if it was a problem with the fan itself then it would do the same when the engine isnt running? but it seems to work fine when the engine isnt running

Jul 8th, 2009, 22:09	#6
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Hmm. It maybe that without the engine running the battery volts are lower and consequently the running current of the fan is just below the level that causes a protective shutdown by the fan speed control unit. Once the engine is running and the battery volts and fan current are increased the shutdown is initiated. Best to measure the fan current and read the ECC fault codes for a better diagnosis.

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