Heater blower relay/switch
Heater blower relay/switch
I have a 1989 G reg BX 19 RD Hatchback RHD manual, non aircon. The heater blower was not working. My mechanic tested the fan motor, and voltage was reaching the motor. A new control unit has been fitted. Since then, the blast of air steadily increases up to about ¾ towards the maximum on the dial, then cuts out. I can hear a click (is this the relay or the switch?) when turning the dial from the off position. The Haynes manual specifies that the relay is to the right of the steering bracket (having taken off the dash trim), but did not say exactly where, so I could not locate it. Does anyone have the part number/amperage/colour of the relay, and where exactly is it located? How do I access the switch, and what part number for the switch?
- electrokid
- 1K Away
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- Location: Woking
Re: Heater blower relay/switch
Welcome to BXClub
If you can hear a click in the area of the steering column when moving the heater blower control through the last few degrees where the fan stops running, then the 'mod' is probably done but if not then have a read through this lot...
http://www.bxclub.co.uk/forum/viewtopic.php?f=15&t=5515
which may tell you the relay type as well - it's the simplest of all car relays - a 'basic' relay if you will - I'm sure a 30 amp relay will do the job ok.
If you can hear a click in the area of the steering column when moving the heater blower control through the last few degrees where the fan stops running, then the 'mod' is probably done but if not then have a read through this lot...
http://www.bxclub.co.uk/forum/viewtopic.php?f=15&t=5515
which may tell you the relay type as well - it's the simplest of all car relays - a 'basic' relay if you will - I'm sure a 30 amp relay will do the job ok.
1992 BX19 TGD estate 228K Rusty - SORNed
2002 C5 HDi SX estate
2002 C5 HDi SX estate
- mat_fenwick
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- Location: North Wales
- x 19
Re: Heater blower relay/switch
It's a 5 pin changeover relay, mounted to the steering column support. It's unlikely to be the relay at fault, especially as you can seemingly hear it clicking! The 'switch' which operates the relay is part of the tracks on the control PCB, but if the relay is clicking that proves it's OK. A look at a wiring diagram (sorry, I can't remember it off hand) should show what part of the circuit could be at fault.
- electrokid
- 1K Away
- Posts: 1764
- Joined: Fri May 09, 2008 2:14 pm
- Location: Woking
Re: Heater blower relay/switch
Usually - but not always Mat - my relay failed 6 months after I did the mod. If the contacts arc at all then it's only a matter of time before the heat melts the plastic and the relay contact moves far enough for it to be open circuit. My relay had a scorch mark next to one of the pins - unusual, but it happens.but if the relay is clicking that proves it's OK.
1992 BX19 TGD estate 228K Rusty - SORNed
2002 C5 HDi SX estate
2002 C5 HDi SX estate
- mat_fenwick
- Moderator
- Posts: 7326
- Joined: Tue Sep 20, 2005 4:08 pm
- Location: North Wales
- x 19
Re: Heater blower relay/switch
Ah - what I meant was that if the relay is clicking it proves that the 'switch' part of of the circuit on the control wiper is OK. You're right though, just because a relay is clicking doesn't mean it's passing current but does prove the control side of the circuit.
- electrokid
- 1K Away
- Posts: 1764
- Joined: Fri May 09, 2008 2:14 pm
- Location: Woking
Re: Heater blower relay/switch
Yes indeed - if it clicks then the circuit that drives it is functioning ok.
As to its location I've seen a number of descriptions of where it's supposed to be, mostly 'somewhere to the right of the steering column' which is indeed where I found mine - but not bolted to anything - it was just dangling on the end of its wiring.
I saw no reason to change that
As to its location I've seen a number of descriptions of where it's supposed to be, mostly 'somewhere to the right of the steering column' which is indeed where I found mine - but not bolted to anything - it was just dangling on the end of its wiring.
I saw no reason to change that
1992 BX19 TGD estate 228K Rusty - SORNed
2002 C5 HDi SX estate
2002 C5 HDi SX estate