[pookie]

My co-worker has a 5 Series and the interior heat never really gets hot. He said even with the temp set on 80 it will only ever get about luke warm. The other issue he is currently having, he said the temp has a auto sensor, and that sometimes the fan will be off and then just come on full blast. He said the fan coming on full blast happens when the settings are at 64-80.

Anyone have an idea on what might cause these issues?

Thanks

[Jazzbass]

E34, E39, or E60? I assume not an F10 otherwise it'd be at the dealer getting fixed under warranty.

[86911TLCAB]

i had lack of heat problem like that in the jeep. The heater valve wasnt opening, allowing the hot coolant to the heater core...likely getting a little warm just from the heat of the engine...was an easy fix once i figured out how the system worked..

[John Clay]

I've never RTM'd on my E39, but I have to manually adjust the temperature on the dial next to the vent in the center of the dash to get temperature I want. Adjusting the auto temperature control on the console by itself doesn't do the trick.

The full blast could be from the auto setting waiting until the car gets warmed up before it blows heat, then it says "you want it hot, I'll get it hot".

[APKhaos]

FWIW, the heater on my Landcruiser went out a while back. Barely warm even with the controls set to max temp. Checked all the usual stuff, but no luck. Like most reasonably modern cars it does not have a heater control valve. Hot water flows through the core constantly and the air mixer doors take care of the temp delivered to the cabin.

Finally popped the cabin temp sensor, which was covered in many years of dust and frass. Gave it a good cleaning with IPA/water and a soft brush. Everything worked perfectly after that.

[Dr K]

Funny you posted this. I'm driving a friend's 2000 540i for the winter (also his Maserati) and even though the heat is set to 63 degrees on both sides (the lowest setting) it constantly blows HOT unless turned completely off. Perhaps we should get the cars together for a compromise...

Anybody know where the cabin temp sensor is in these cars?

[John Clay]

Originally Posted by Dr K

Funny you posted this. I'm driving a friend's 2000 540i for the winter (also his Maserati) and even though the heat is set to 63 degrees on both sides (the lowest setting) it constantly blows HOT unless turned completely off. Perhaps we should get the cars together for a compromise...

Anybody know where the cabin temp sensor is in these cars?

Check my post. There may be nothing wrong with the car.

[Dr K]

Thanks. I'll look on the dashboard later.

[Lucky]

Originally Posted by pookie

My co-worker has a 5 Series and the interior heat never really gets hot. He said even with the temp set on 80 it will only ever get about luke warm. The other issue he is currently having, he said the temp has a auto sensor, and that sometimes the fan will be off and then just come on full blast. He said the fan coming on full blast happens when the settings are at 64-80.

Anyone have an idea on what might cause these issues?

Thanks

I think an 05 is similar to my 08, so this may help. Have your friend press the button in the middle of the temp control knob and the iDrive will display a pictogram of individual vent temp and flow speed settings -- it may very well be that someone messed with these and the vent temps are set cold and at high or max flow. This is a great feature -- you can blow soft cold air at your face and blast your feet with fire -- but it confuses people that haven't bothered to learn how to control the system. If this doesn't solve the problem, then it may be broken... but from what I've seen that would be a rare event on these cars.

[pookie]

Thanks guys. I've passed the info on to him.

Jazz- its a 525. My bad, I have no idea what the internal BMW designation is, I'm not a BMW guy. Now if you'd ask me about Jeeps internal designations, I'm your guy. I can talk all day about CJ,TJ,YJ,JK,LJ,KJ,KK,XJ,ZJ,WJ...