bit of an odd one this and i'm having trouble trying to fix it
the air con works but the AC condenser fan doesn't speed up as it should
relay was replaced last year with a mitsuba and at the time everything worked as it should but recently i have noticed the fans are not speeding up when the air con is being used
i had the gas re charged about a month ago and as far as i can tell there is no leaks
things iv'e checked
mitsuba AC clutch relay - works fine and the clutch engages like it should
mitsuba 5201 cooling fan relay - works as it should. this is a 5 pin relay that is sat next to the Ac clutch relay ( 5201 is the grey one ) the way it works is in it's off state it connects directly to both fans, the fans are wired in series and spin at half speed.
when the relay is engaged it grounds the AC condenser fan which gives the fan 12 volts to spin it at full speed and if i physically close the relay or bridge it the fan spins at full speed but the engine radiator fan stops spinning which isn't supposed to happen
all the fuses associated to air con and fans are fine iv'e checked n double checked em all
both fans work as they should so they can be ruled out
the only glimmer of hope so far is if i disconnect the AC high pressure sensor both fans spin full speed and stop spinning when i turn the AC off but this throws an error code and the AC clutch doesn't engage
iv'e seen a few talk about the high pressure sensor calling it a switch and talk about bridging the terminals, this is something i wouln't want to do it's not a switch it has 3 connections which tells you it's not a simple switch and the sensor itself varies it's impedance with whatever the pressure is.
once the pressure reaches a certain PSI it activates the condenser fan to spin at full speed i think it is also responsible for disengaging the AC clutch as well at some point
this is as far as iv'e got but before i swap out the High pressure sensor does anybody know the behaviour of the sensor ?
there's no point in swapping it if it is doing it's job and the fault lies elsewhere
iv'e been scouring the net for days with this one the closest iv't got was some guy with exactly the same problem but his fix was the radiator fan fuse on a different type of honda but like i said my fuses are fine and the fuse he changed isn't the same on the civic and i can't find the equivalent fuse that does the same job although i can find and have checked the fuse for the radiator fans and there all fine
anybody come across this before ?
the air con works but the AC condenser fan doesn't speed up as it should
relay was replaced last year with a mitsuba and at the time everything worked as it should but recently i have noticed the fans are not speeding up when the air con is being used
i had the gas re charged about a month ago and as far as i can tell there is no leaks
things iv'e checked
mitsuba AC clutch relay - works fine and the clutch engages like it should
mitsuba 5201 cooling fan relay - works as it should. this is a 5 pin relay that is sat next to the Ac clutch relay ( 5201 is the grey one ) the way it works is in it's off state it connects directly to both fans, the fans are wired in series and spin at half speed.
when the relay is engaged it grounds the AC condenser fan which gives the fan 12 volts to spin it at full speed and if i physically close the relay or bridge it the fan spins at full speed but the engine radiator fan stops spinning which isn't supposed to happen
all the fuses associated to air con and fans are fine iv'e checked n double checked em all
both fans work as they should so they can be ruled out
the only glimmer of hope so far is if i disconnect the AC high pressure sensor both fans spin full speed and stop spinning when i turn the AC off but this throws an error code and the AC clutch doesn't engage
iv'e seen a few talk about the high pressure sensor calling it a switch and talk about bridging the terminals, this is something i wouln't want to do it's not a switch it has 3 connections which tells you it's not a simple switch and the sensor itself varies it's impedance with whatever the pressure is.
once the pressure reaches a certain PSI it activates the condenser fan to spin at full speed i think it is also responsible for disengaging the AC clutch as well at some point
this is as far as iv'e got but before i swap out the High pressure sensor does anybody know the behaviour of the sensor ?
there's no point in swapping it if it is doing it's job and the fault lies elsewhere
iv'e been scouring the net for days with this one the closest iv't got was some guy with exactly the same problem but his fix was the radiator fan fuse on a different type of honda but like i said my fuses are fine and the fuse he changed isn't the same on the civic and i can't find the equivalent fuse that does the same job although i can find and have checked the fuse for the radiator fans and there all fine
anybody come across this before ?
