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Topic: Intermittent no air from blower in cabin (Read 349 times) |
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DavidBE
Full Member
1998 Ghia X 2.9 24V Auto Estate
Posts: 135
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Intermittent no air from blower in cabin
« on: Nov 24th, 2021, 11:20pm » |
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Ghia-X, so manual control ventilation/heating/air-con, NOT climate control.
A few weeks ago (4? 6? My memory and sense of time is useless) I was on one of my longer trips - there and back to somewhere 5 miles away, rather than my more usual to places 1/2 mile and 2 miles away - and it was feeling a bit nippy so I switched the fan up from 1 to 3 ... then realised I was getting no air flow from the vents. I could hear the fan, and hear it change its speed between 1, 2 and 3, but I could feel no airflow from the dashboard vents, or the footwell vents, or the windscreen vents. Altering the distribution control, blower speed, A/C on/off, nothing produced any air from any vents, although I could hear the blower fan. Next time I went out, though, I got air from vents as expected from how I'd left the controls as soon as I started the engine.
Each following time I didn't notice the problem again (although on days it wasn't cold or hot I might not have noticed with the fan speed usually left on 1).
Then yesterday it happened again. It was feeling a bit chilly, so I turned the blower fan speed up, heard the blower fan speed go up, but then realised I was getting no air flow through dashboard, footwell or windscreen vents at all. Again, I heard the blower speed change as I switched it between 1, 2 and 3, but no airflow (so no heating).
And today I went out again, and immediately had full expected airflow the moment I started the engine corresponding to how I'd left the controls yesterday: hot, speed 3, distribution to screen and footwell, dashboard vents open, A/C on, which today gave me warm air roaring out of dashboard vents and into footwell and onto windscreen when yesterday it gave me nothing.
I am struggling to think of what (intermittent) fault could cause this. No heat, or no A/C, or no fan, or a broken distribution control link I could start looking ... but what can cause no air out of open dashboard vents when the fan is running?
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Simmo
Administrator
I'm an OAP !
Posts: 5508
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Re: Intermittent no air from blower in cabin
« Reply #1 on: Nov 25th, 2021, 10:13am » |
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I think you may have answered your own question. The only reason for the airflow to be restricted in the way you describe is if the relevant 'flaps' are not opening/closing.
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Now I'm an OAP
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Intermittent no air from blower in cabin
« Reply #2 on: Dec 7th, 2021, 1:58pm » |
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Could be the evaporator icing up, next time it happens try lifting the cover over the aircon filters - this will allow air in without passing through the evaporator, if the vents now work you may have a problem with the de-ice switch or temperature probe.
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ABS multiplug wheel sensor pins MK IV or MK 20
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