Hey fellas,
So I recently redid the dash and HVAC controls. While redoing this, I attempted to fix the blower switch. Sadly, that was unsuccessful only turning on at full blast again. Now everything is back together, I'm observing a very weird behavior. When the A/C is on, the amount of air blowing out of the central vents varies EXTREMELY with the speed of the vehicle.
When stop, it's barely a trickle. When moving, it's blowing STRONG. I can hear the blower motor running and when the A/C is off it seems to be fine.
Is there some sort of interior/exterior vent that I'm missing or that is no-op? It feels like all the sliders are working, but I'm not sure how to test.
Thanks!
A/C Blowing - Speed Dependant
Moderators: GRNSHRK, ron, bfons
A/C Blowing - Speed Dependant
Evan Ruff, Atlanta GA, Engineer
1970 Ford F100
1972 BMW 3.0CSi, L-Jet 3.5L
1978 Ferrari 308GTB
1985 BMW M635CSi
2016 BMW M2
1970 Ford F100
1972 BMW 3.0CSi, L-Jet 3.5L
1978 Ferrari 308GTB
1985 BMW M635CSi
2016 BMW M2
- 86_6series
- Platinum Member
- Posts: 1073
- Joined: Mon Apr 02, 2007 10:08 pm
- Location: West Nyack, NY
Re: A/C Blowing - Speed Dependant
I'll make 2 guesses.
1- At idle the alternator is not feeding enough juice for the fan load.
2- More likely the fan is not working and outside air at speed is
giving you the flow of air thru the vents. Top vent is outside fresh air only.
Center, left and right vents are AC connected.
that's all I got.
1- At idle the alternator is not feeding enough juice for the fan load.
2- More likely the fan is not working and outside air at speed is
giving you the flow of air thru the vents. Top vent is outside fresh air only.
Center, left and right vents are AC connected.
that's all I got.
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3
-
- Platinum Member
- Posts: 4493
- Joined: Tue Mar 16, 2010 8:32 pm
- Location: usually in the barn, Kent, England.
Re: A/C Blowing - Speed Dependant
My immediate thought was as 1 above. Have you tried running the engine up with the car stationary and aircon switched on?86_6series wrote: ↑Thu May 30, 2019 2:31 pm I'll make 2 guesses.
1- At idle the alternator is not feeding enough juice for the fan load.
2- More likely the fan is not working and outside air at speed is
giving you the flow of air thru the vents. Top vent is outside fresh air only.
Center, left and right vents are AC connected.
that's all I got.
Re: A/C Blowing - Speed Dependant
I am out of town currently but will give it a shot on Monday. Thanks guys!
Evan Ruff, Atlanta GA, Engineer
1970 Ford F100
1972 BMW 3.0CSi, L-Jet 3.5L
1978 Ferrari 308GTB
1985 BMW M635CSi
2016 BMW M2
1970 Ford F100
1972 BMW 3.0CSi, L-Jet 3.5L
1978 Ferrari 308GTB
1985 BMW M635CSi
2016 BMW M2