Author Topic: Blowers on, but very little air  (Read 280 times)

Offline shail

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Blowers on, but very little air
« on: July 30, 2020, 07:00:55 PM »
I've been having an issue that sometimes the AC doesn't blow a lot of air thorough the vents.  The blower can be heard loud and clear on all speeds but very little air. Turning AC on or off makes no difference, niether does changing temp or direction.

This only happens sometimes, I've pinned it down to it happening when it's hot outside and I'm on the motorway.  Not sure if that's related.

Anyone had a similar issue?

Offline Pudding

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Re: Blowers on, but very little air
« Reply #1 on: July 31, 2020, 03:08:11 PM »
Any fault codes in the hvac module? Worth checking for ambient temp sensor and blend door actuator codes.


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Offline rich83

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Re: Blowers on, but very little air
« Reply #2 on: July 31, 2020, 11:50:47 PM »
I've been having an issue that sometimes the AC doesn't blow a lot of air thorough the vents.  The blower can be heard loud and clear on all speeds but very little air. Turning AC on or off makes no difference, niether does changing temp or direction.

This only happens sometimes, I've pinned it down to it happening when it's hot outside and I'm on the motorway.  Not sure if that's related.

Anyone had a similar issue?

Does it happen when youre on a longish journey? But ok on short journeys?

Offline shail

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Re: Blowers on, but very little air
« Reply #3 on: August 01, 2020, 09:01:53 AM »
It's only on long journeys, but more often than not it's ok.  Never happens on my way to work which is 20mins.  Only happens on longer motorway journeys. 

I've scanned with a generic Bluetooth scanner which doesn't bring any codes apart from a driver's door lock module issue.

Offline Pudding

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Re: Blowers on, but very little air
« Reply #4 on: August 01, 2020, 12:23:18 PM »
Could it be the fan resistor pack overheating on long journeys and slowing the fan down?  Can't think of anything else tbh if it's fine on short journeys.

I have a similar problem with my wipers funnily enough!  Fine on short journeys, but on long ones, they almost slow down to a complete halt  :grin:


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Offline rich83

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Re: Blowers on, but very little air
« Reply #5 on: August 01, 2020, 03:25:46 PM »
It's only on long journeys, but more often than not it's ok.  Never happens on my way to work which is 20mins.  Only happens on longer motorway journeys. 

I've scanned with a generic Bluetooth scanner which doesn't bring any codes apart from a driver's door lock module issue.


Yeah i have the same issue... i think its one of the flap servos that controls the air direction.

Offline shail

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Re: Blowers on, but very little air
« Reply #6 on: August 01, 2020, 04:08:07 PM »
Could it be the fan resistor pack overheating on long journeys and slowing the fan down?  Can't think of anything else tbh if it's fine on short journeys.

I have a similar problem with my wipers funnily enough!  Fine on short journeys, but on long ones, they almost slow down to a complete halt  :grin:

Don't think it's the fan resistors, as you can hear the fan on full speed when you turn it up.


Offline shail

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Re: Blowers on, but very little air
« Reply #7 on: August 01, 2020, 04:08:57 PM »
It's only on long journeys, but more often than not it's ok.  Never happens on my way to work which is 20mins.  Only happens on longer motorway journeys. 

I've scanned with a generic Bluetooth scanner which doesn't bring any codes apart from a driver's door lock module issue.


Yeah i have the same issue... i think its one of the flap servos that controls the air direction.

That would make sense.  Bring back the manual mechanical mechanism of my old mk2!

Offline Pudding

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Re: Blowers on, but very little air
« Reply #8 on: August 01, 2020, 08:22:09 PM »
The blend door actuators (servos) fault code in the hvac module if the commanded movement isn’t met.


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