1999 C70 heater fan problems

redc70t5 · Oct 10th, 2009, 15:34

My C70 has developed a strange problem.
When it starts up, and I slide the fan speed switch to the right, from off to on,the fan blows for about 2-3 seconds, then stops. The Air con on and recirc air buttons flash their led's many times, then go off.
Sliding the switch to off then on again, nothing happens, fan does not go on. Switching off the ignition and trying again, and the whole cycle repeats.

I've tried starting it with aircn switched to on, fan speed to full even having the air blowing at the screen, or other positions. None of it makes any difference.

I have checked the plugs at the back of the heater control, they are in fine.

Any ideas what it could be, or how to fix it?

Paul de France · Oct 10th, 2009, 15:52

I had exactly this problem (1999 V70 2.5 10V) and , after fiddling with just about everything I could think of, it was somewhere on this website that suggested gently blowing out the dust from the cabin temperature sensor. I had no idea it existed! This is located behind a small grill located next to the heated rear window switch on the dash. Naturally on a car that is used for everything, this can get a bit mucky with airborne fluff. It really seemed too simple! Just blowing manually into the grill by mouth fixed the problem immediately. Unbelievably simple! So I joined today. Try it.

redc70t5 · Oct 10th, 2009, 16:30

Thanks for the advice, but in my case, It didn't cure the problem.

The sensor was really dusty. I gently blew it all out. Still sufffering the same issue i'm afraid, no change at all.

I'm willing to try anything else you think may help.

Flingel · Oct 10th, 2009, 17:32

Had this a couple of weeks ago.
Tried cleaning sensor from the front but no joy, mixture of blowing and vacuuming.
Took it out and was amazed by the amount of crud in there.
Easy enough to do;
Remove the radio, (Make sure you've got the code!) put your hand up inside the aperture and ease the ECC unit forwards, trust me it will come out, (eventually!)
Then you can get your hand in to release the two clips, push both together and withdraw the sensor, give it a good blow to make sure the fan is running free.
Be careful with the probe, it is only thin gauge wire.
As they say reffitting is the reversal of the removal.

Cheers,
Tel.

redc70t5 · Oct 10th, 2009, 19:46

I'll give that a go tomorrow now, bit dark to be doing it, especially if its such a small delicate thing.

i'll let you know how I get on.

grass hopper · Oct 10th, 2009, 22:28

recomend get the fault code read,will probably read something like fan motor excessive current draw,if so might require a new one.

bonus123 · Oct 11th, 2009, 10:13

sounds to me like the blower motor is shot mate,had exactly the same happen to me on my c70,got a second hand unit for next to nowt and was a doddle to change.

redc70t5 · Oct 11th, 2009, 16:34

I took the sensor out, it was a bit dusty buy not excessively so. plugged it back in, made no difference.

I then disconnected it and ran the heater fan, exactly the same problem, no different.

All the connector blocks are in ok. I really have no idea what to do next.

grass hopper · Oct 11th, 2009, 20:09

Quote:

Originally Posted by redc70t5

I took the sensor out, it was a bit dusty buy not excessively so. plugged it back in, made no difference.

I then disconnected it and ran the heater fan, exactly the same problem, no different.

All the connector blocks are in ok. I really have no idea what to do next.

previous posts might help.

storming · Oct 11th, 2009, 20:16

Could be need one of these, easy job to change:

http://cgi.ebay.co.uk/VOLVO-S70-C70-...d=p3286.c0.m14

Oct 10th, 2009, 15:34	#1
redc70t5 New Member Last Online: Mar 13th, 2010 20:43 Join Date: Oct 2008 Location: newbury	1999 C70 heater fan problems My C70 has developed a strange problem. When it starts up, and I slide the fan speed switch to the right, from off to on,the fan blows for about 2-3 seconds, then stops. The Air con on and recirc air buttons flash their led's many times, then go off. Sliding the switch to off then on again, nothing happens, fan does not go on. Switching off the ignition and trying again, and the whole cycle repeats. I've tried starting it with aircn switched to on, fan speed to full even having the air blowing at the screen, or other positions. None of it makes any difference. I have checked the plugs at the back of the heater control, they are in fine. Any ideas what it could be, or how to fix it?

Oct 10th, 2009, 17:32	#4
Flingel VOC Member Last Online: Sep 25th, 2023 14:09 Join Date: Nov 2006 Location: Wakefield (ish)	Had this a couple of weeks ago. Tried cleaning sensor from the front but no joy, mixture of blowing and vacuuming. Took it out and was amazed by the amount of crud in there. Easy enough to do; Remove the radio, (Make sure you've got the code!) put your hand up inside the aperture and ease the ECC unit forwards, trust me it will come out, (eventually!) Then you can get your hand in to release the two clips, push both together and withdraw the sensor, give it a good blow to make sure the fan is running free. Be careful with the probe, it is only thin gauge wire. As they say reffitting is the reversal of the removal. Cheers, Tel. __________________ VOC Member: 20309 2002 C70 Convertible

Oct 10th, 2009, 22:28	#6
grass hopper Premier Member Last Online: Mar 18th, 2011 13:38 Join Date: May 2009 Location: grassmere!	poss fan faulty. recomend get the fault code read,will probably read something like fan motor excessive current draw,if so might require a new one. __________________

Oct 11th, 2009, 10:13	#7
bonus123 Member Last Online: Sep 9th, 2012 16:54 Join Date: Nov 2007 Location: sunderland	sounds to me like the blower motor is shot mate,had exactly the same happen to me on my c70,got a second hand unit for next to nowt and was a doddle to change. __________________ 98 s40 1.8..sold 98 s40 t4..sold 98 v40 t4..sold 2000 c70 t5 sold 2002 s40 1.6 horrid thing

Oct 11th, 2009, 20:16	#10
storming Senior Member Last Online: Jun 10th, 2015 21:02 Join Date: Sep 2008 Location: bristol	heater fan Could be need one of these, easy job to change: http://cgi.ebay.co.uk/VOLVO-S70-C70-...d=p3286.c0.m14

Oct 10th, 2009, 15:52	#2
Paul de France Nutwench Last Online: Oct 21st, 2015 01:39 Join Date: Oct 2009 Location: Keynsham	I had exactly this problem (1999 V70 2.5 10V) and , after fiddling with just about everything I could think of, it was somewhere on this website that suggested gently blowing out the dust from the cabin temperature sensor. I had no idea it existed! This is located behind a small grill located next to the heated rear window switch on the dash. Naturally on a car that is used for everything, this can get a bit mucky with airborne fluff. It really seemed too simple! Just blowing manually into the grill by mouth fixed the problem immediately. Unbelievably simple! So I joined today. Try it.

Oct 10th, 2009, 16:30	#3
redc70t5 New Member Last Online: Mar 13th, 2010 20:43 Join Date: Oct 2008 Location: newbury	Thanks for the advice, but in my case, It didn't cure the problem. The sensor was really dusty. I gently blew it all out. Still sufffering the same issue i'm afraid, no change at all. I'm willing to try anything else you think may help.

Oct 10th, 2009, 19:46	#5
redc70t5 New Member Last Online: Mar 13th, 2010 20:43 Join Date: Oct 2008 Location: newbury	I'll give that a go tomorrow now, bit dark to be doing it, especially if its such a small delicate thing. i'll let you know how I get on.

Oct 11th, 2009, 16:34	#8
redc70t5 New Member Last Online: Mar 13th, 2010 20:43 Join Date: Oct 2008 Location: newbury	I took the sensor out, it was a bit dusty buy not excessively so. plugged it back in, made no difference. I then disconnected it and ran the heater fan, exactly the same problem, no different. All the connector blocks are in ok. I really have no idea what to do next.

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