C30 Faulty AC Switch
Al (@ab1)
Melbourne
On my newly acquired c30 I have noticed the fan likes to come on after it's been sitting for a while and it's not hot I would imagine. Perhaps this is normal function I scanned it for codes and nothing came back. No over heating
Comments
Never saw that happen on our C30. In fact it has never come on while the engine is switched off...sounds odd to me.
Do you have any more details on when the fan is active eg: engine/A.C on/off, what speed fan is running at?
Fan modules are a common issue on some of the modern volvos (xc60/70/90) but not so much on the p1.
sorry i mean when i just turn the car on after its been sitting. the engine is warmed up but say i come back to it an hour later and start it the fan will come on full blast for about a minute or so then switch off. AC switched off
That definitely doesn’t sound normal...but no idea what it could be.
it seems to operate completely normally aside from startup and besides a cold start.
Far out theory...I’m pretty sure when you start the car the A/C compressor comes on for a short time even if the A/C switch on the dash is off (I assume maybe its to circulate the coolant and keep things lubricated?) If one of the A/C pressure switches that controls the cooling fan speeds is defective, it could cause the fan to come on for a short period after start-up. Maybe let the car get up to temp, then hit the A/C switch - does the cooling fan come on high immediately? If so, that could indicate a problem with one of the A/C sensors. Just a theory and could be totally wrong.
you could be completely on the money there. as i do hear the ac or what i thought was ac click on even with it set to off on startups.
i shall investigate further
i did notice that the a/c performance didnt seem particularly strong given its a modern vehicle. perhaps these two are interconnected
The AC on our C30 is awesome, so if yours isn’t great, I’d be looking there as a start.
According to VIDA that's what happens to ensure the A/C system is cycled even when the A/C is switch off from the dashboard.
okay interesting. would that mean the fan function is normal or it still implies there may be an issue with one of the pressure switches
I think @Tzantushka was just confirming my suspicions that the A/C compressor cycles on for a short time when the car is started. Your electric cooling fan on the radiator should not run at a high speed at any time unless it’s getting a signal telling it the engine is hot. I think you still have a problem. My C30 the A/C compressor runs for a short time after starting the car (maybe 5-10 seconds) but I never hear the radiator fan come on unless I’m in slow traffic with the A/C on.
i spoke to a friend with a c30 2.4i and they said they have the same thing so we must both have the same issue. a faulty a/c switch seems like the likely culprit
i got my ac regased and unforuntaely it did not restore its power. the a/c clutch appears to cycle very quickly which seems to me that there is either a blockage or faulty pressure switch. im guessing the latter.
does anyone know the location of this switch. i suspect changing this will solve my fan issues.
Pressure switch is to the right of brake booster/reservoir.
Is there one on the compressor I spoke to a mechanic and they said theres one on the compressor that needs the gas to come out again
Did they tell you what the pressures were when the A/C is running? I'm pretty sure there isn't anything on the compressor just the electrical connector for the clutch.
They may be confused with some of the other Volvo models that have a suction control valve Ill have a look at my c30 tomorrow
im not sure he just said that its the most common failure in the ac system. volvo mechanic so id assume he knows what hes talking about
Not all Volvo mechanics are equal
Well that is slightly relieving. Is that off a t5?
You wouldn't happen to have the part number by any chance? I'll order it asap
Which part numbers do you want Pressure switch or compressor or both