There are four plugs, i did some playing a few months ago and found xud ones fit. None of the motor factors near me were able to get hold of the original plugs that came out of it and peugeot will only sell it as a whole unit for a ridiculous price (best part of £200 iirc). The unit sits on top of the gearbox under the standard intake pipe.
You'll know if it's working because you'll have hot air from the heaters within a minute or so of starting and the car will get up to running temperature within five minutes. Actually makes a significant difference to efficiency, worth fixing imo. If it's not working test it as Bash suggests above.
You'll know if it's working because you'll have hot air from the heaters within a minute or so of starting and the car will get up to running temperature within five minutes. Actually makes a significant difference to efficiency, worth fixing imo. If it's not working test it as Bash suggests above.