FBH always running

facer · Jan 14, 2011

I started the TD4 this morning and the outside temp was 13°c but the FBH still started. I'm sure Ive read somewhere its not supposed to run over 5°c. Ive looked through the forum and someone suggests it could be the ambient air temperature switch is stuck closed. Can someone tell me where I can find this switch ?

BTW I only drove about 2 miles on the school run but engine temp was reading the normal half way mark. Dunno if that makes any difference.

Many thanks in advance.

jacko4034 · Jan 14, 2011

The temp sensor switch is located behind the bumper. I got to mine by cutting a flap in the mesh grill, so didnt take the bumper off. Once switch replaced, i just folded the flap back down. Can hardly tell.

The switch doesnt operate at exactly 5 degrees though, this is more of a guide. The heater may well come on above this, and, this is only my experience,will usually stay on beyond a 2 mile run, as it needs to reach a pre-set temp, then start its cool down cycle. Mine has stayed on beyond a six mile run, even though the coolant temp showed normal. It wasnt burning fuel by the end of the run though, just cooling down.

Hope this helps.

Mr K · Jan 14, 2011

I has a simliar question and posted here (no real ansa) and here and got a good answer.

facer · Jan 14, 2011

Mr K said:
I has a simliar question and posted here (no real ansa) and here and got a good answer.

Still none the wiser :LMAO:

facer · Jan 15, 2011

So is it normal to start up beyond 10°c ?
Did anyone elses FBH kick in yesterday even tho the outside temp was above 13°c ?

hippolover · Jan 15, 2011

You'll find it won't be off until about March/ April. The air temp may be high(ish) but the block temp will still be low. Add in the wind chill and quite a basic sensor then what you have is quite normal.

adey1 · Jan 15, 2011

mine has been running every day since begining of november when i got it working by resetting the ecu

Mr K · Jan 15, 2011

Mine is running, although not for long, when very cold it would still be running after engine off but now I think it goes off when the engine reaches temp.

Mr K · Jan 16, 2011

Didn't come on at all today.

hippolover · Jan 16, 2011

Sounds normal then. Same here but was only on for a short bit. 70 mile run in 9 degrees got things hot enough for it not to be on for the return trip.

FBH always running

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