If you are having heater or climate controls issues as mentioned here, site viewer Shaun L reckons he's found the issue. If he's correct, it's a fairly easy fix. This is the potentiometer (pot) that moves with the temperature selector inside the heater controller....
Smartmods
for all your modding needs, recommended by Evilution
Kane Harrison
451 Heater Controller LEDs
How to change the SMD LEDs in the 451 heater controller
451 Heater Fan Brushes
451 Heater Motor Brushes For some reason, it's mainly the American 451s that suffer with brush problems. Dunno why but it does affect non Americans as well. The standard brushes seem low quality and seem to wear very quickly. Probably because the commutator gets a...
451 Heater Fan Removal
Many owners are experiencing faults with their blower motors. Mainly American smarts unusually.
451 Heater Faults
Hot or cold. No warm
451 Heater Resistor Pack
How to remove and change the 451 heater resistor pack
451 High Level Brake Light
Changing the bulbs in the high level brake light assembly.
451 High Pressure Fuel Pump
Highlighted below is the high pressure fuel pump. It's fed by the low pressure fuel pump in the fuel tank and is spun by the cam shaft. However, to get to this point you have to remove the airbox, intercooler and gear change motor. Disconnect the pipe highlighted...
451 Highline Radio Replacement
Let's be honest, the Bosch Highline stereo is a piece of over-priced shit, you may as well sell it and swap it out for something better
451 Horn Not Working
It has taken 10 years for this issue to appear but I knew it would eventually occur. When I looked at the 451 wheel back in 2007 I could see a weak point in the system. I'm sure it'll soon become a common problem. Smart knew it'd be a problem as they changed the...
451 Horn Upgrade
The 451 standard horn is embarrasing, sort it out.
451 Ignition Barrel Removal
Remove the SE Drive cover and look into the base of the ignition barrel. You'll see a tab. This tab is locked in the outward position and holds the barrel into the housing. Put your key into the ignition... ...and turn it 90 degrees clockwise. Stick a screwdriver into...
451 Interior Handle Removal
How to remove the handles to change the window switches.
451 Interior Light Wiring
Key:
E = Earth
C4/8 = Connection plug 4, pin 8
Fuse* or F* = Direct connection fuse number
Black Yellow = Wire colour
Modules are labeled in the picture.
451 Key Fob Battery
Batteries don't last forever so instead of getting locked out of your car, let's change the battery for a fresh one.
451 Key Resync
Issue I found that if you don't use one of your 451 keys for a long time and the battery runs out, when you refit a new battery, you may find that the key still won't unlock the central locking. Fault Or Security Feature? Unknown but at a guess, I would say it's a...
451 Lambda Sensor Removal
Euro 4 Lambda Exhaust Remove the rear panels and the crash bar. Spray both lambda sensors with PlusGas before attempting to remove with a 22mm spanner. The upstream sensor in in the upper elbow. The 2nd is in the silencer. This uses the same 22mm spanner. Disconnect...
451 Lambda Sensors
These sensors measure the air/fuel mixture ratio and adjust the engine parameters. If either of these are faulty you can have an engine light on, poor running or bad mpg.
451 Lateral Movement Sensor
It's fairly rare for the lateral movement sensor (sometimes called the yaw sensor) to fail on the 451. However, this used to be the same case on the previous models but eventually they started failing. The biggest cause of it failing is due to water ingress. This is...
451 LCD Retrofit
For the 1st year (or so), the 451 came with a useful display on the speedo.
Unfortunately the dumbed down American display took over leaving us missing 2 piece of information.
Let us get it back.