Author Topic: HEATER BLOWER FAN NOT WORKING  (Read 361 times)

carrera

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #15 on: 17 May 2019, 09:06:07 AM »
I doubt that was the problem.

Yesterday I was removing components from the breaker car. There was a ton of leaves to the left and right of the scuttle area. In the centre where the fan is the assembly is as follows

Plastic cover /shield - this goes in a curved l shape from the upper rear to the lower front of the void
Plastic shroud around the void where the fan motor sits
Fan motor

There was absolutely no sign of any debris in the fan area

I can put a picture up later if you like ?
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sgould

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #16 on: 17 May 2019, 09:32:36 AM »
The compressor has a clutch on the pulley.  It's engaged electrically.  Is that connection secure and the clutch working?  If the clutch doesn't engage, then the compressor will not work.
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carrera

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #17 on: 17 May 2019, 09:34:33 AM »
Will there also be a pressure sensor for the gas - under or over pressure and the compressor will not engage ?
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sgould

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #18 on: 17 May 2019, 09:43:25 AM »
There is a gas pressure sensor and other things  that control the switching of the aircon, like outside temperature, etc.  But the logic of those is read and sorted in the dashboard ACC control panel. It all ends up with an on/off power supply to the compressor clutch.

If the clutch is worn, it can also slip and fail to engage, but it can be shimmed up.  From memory there's a 60 thou clearance.  So it's possible that the clutch could not engage even with a power supply.  But that's less likely to be intermittent, I would guess.

The compressor clutch actuation wire runs down behind the RH headlamp alongside the radiator.  It has a blue heatproof sheath.

Here's a picture.
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sgould

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #19 on: 17 May 2019, 09:53:46 AM »
Another check.  If the compressor is working OK, then the  two metal pipes under the bonnet running along the RH front wing will be at different temperatures.  If they are, then look at the blower fan more carefully.  You may have two, or a linked fault.  I'm not 100% sure of the system, but it's possible that if the blower fan fails, the sensors in the aircon unit may sense something and not enable the compressor.  But a pretty simple check.  If the two metal aircon pipes are the same tmperature, the compressor is not being engaged.
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carrera

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #20 on: 17 May 2019, 02:25:54 PM »
Here's a photo of the area where the blower fan sits, along with the cover plastics. This has not been cleaned.

You can also see the wire for the fan controller going from one side of the void to the other

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collywobble

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #21 on: 17 May 2019, 04:36:23 PM »
Went for a 35 mile drive today to the local farmers co-operative along what used to be the main road into Barnstaple from Taunton but is now a quiet country road. Air-con worked perfectly - set on auto gave a nice gentle warmth which just took the chill way.  The longer I own this car the more of a mystery it becomes!

carrera

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Re: HEATER BLOWER FAN NOT WORKING
« Reply #22 on: 17 May 2019, 05:16:28 PM »
It obviously thinks it has been taken into the dealer for diagnosis and refuses to show any symptoms..........  ;D
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