Heater fan working only in 1st and 2nd possition
Heater fan working only in 1st and 2nd possition
So my heater fan works only in 1st and 2nd possition and when I turn 3rd it stops. What could be the problem? I read that heater resistor could be broken but where I could find it? I tried to take out this turning switch itself but everything seems find there. By the way how you change cigarette lighter lamp. I took out plastic cover with cigarette lighter itself but then can't reconnect wiring to as wire is such short.
Re: Heater fan working only in 1st and 2nd possition
I may be wrong but I'm sure the heater resistor is bad only when the fans are not turned to maximum (so anything but 4).
It may be the switch its self.
Don't really know about the heaters because mine has none!
It may be the switch its self.
Don't really know about the heaters because mine has none!
Re: Heater fan working only in 1st and 2nd possition
Heater resistor I'd say. Easy way to find out is, turn the fan to position 3 with ignition on, take resistor out and touch the three input wires to the 1 output wire until you get max fan speed. This proves that there is no break in the circuit and that the problem exists within the resistor.
Re: Heater fan working only in 1st and 2nd possition
I have this issue too, it happened at the same time that the fan got stuck. I should find a resistor
Re: Heater fan working only in 1st and 2nd possition
Don't forget that on "full" speed the heater fan does not take power through the resistor but directly via a relay (located under the dash). It is most unlikely the resistor pack is at fault - in fact if the lower two speeds work ok the resistor must be working. If only full speed is absent the fault must be in the feed to or from the relay or in the trigger feed from the fan switch. Check fuse 12 (full speed). Fuse 19 guards speeds 1, 2 and the trigger for speed 3 relay.
Look at the circuit diagram - all will be revealed.
Mac (I'm not here - really)
Look at the circuit diagram - all will be revealed.
Mac (I'm not here - really)
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.
1950 pair of legs that don't work very well.
Re: Heater fan working only in 1st and 2nd possition
Haha, thanks Mac! thats helpful. Dont worry, we wont say anything, I hope you're recoveringmac wrote:Don't forget that on "full" speed the heater fan does not take power through the resistor but directly via a relay (located under the dash). It is most unlikely the resistor pack is at fault - in fact if the lower two speeds work ok the resistor must be working. If only full speed is absent the fault must be in the feed to or from the relay or in the trigger feed from the fan switch. Check fuse 12 (full speed). Fuse 19 guards speeds 1, 2 and the trigger for speed 3 relay.
Look at the circuit diagram - all will be revealed.
Mac (I'm not here - really)
Re: Heater fan working only in 1st and 2nd possition
Than you I would check everything. But where is resistor located exactly? Behind fan switch?
Re: Heater fan working only in 1st and 2nd possition
Under the bonnet and under the heater box top cover
Re: Heater fan working only in 1st and 2nd possition
So I need to remove front heater box cover? All these clamps? Because some are pain to get to.
Re: Heater fan working only in 1st and 2nd possition
No just the cover on top, should just be clipped in. Might be 1 or 2 screws I can't remember. It's really easy to take off.
Re: Heater fan working only in 1st and 2nd possition
On a mk2 box, a mk3 is a "take the entire box out" job then undo the clips.Speedy88 wrote:No just the cover on top, should just be clipped in. Might be 1 or 2 screws I can't remember. It's really easy to take off.
Do the test for the bit Mac talks of first, if 1 and 2 work, it's not your heater resistor.
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
Re: Heater fan working only in 1st and 2nd possition
Thank you very much. The 3rd possition is now working. It was connector at the relay not making good contact.