Bmw lpg with heater blowing hot and cold
 

Hi
I have a 2003 4.4 x5 with an LPG conversion. The problem is the heater blows hot and then cold and then hot again as I am driving along.

It normally gets warmer as the revs get higher, but lately just seems to change heat for no reaon.

I have had a new water heater valve fitted and do not know where to go next...

Any ideas?

Andy

Have you checked the engine thermostat? The gauge is not very reliable as it is controlled by the computer. Also could it be air in the cooling system?
Cheers,

Is there a way to check the thermostat... I dont think any air is in the system, but after reading several posts it seems to take a few times to clear air, i can only say that none is coming from bleed screw.

The best way to check is monitoring the engine coolant temperature. Some scanners/software can do it and I think you may be able to do it from the cluster if you unlock it. (Try a quick search for that one.)
I have a connection with Leicester University among other things.

Thanks for that Zulu, hope your memories of Leicester are good ones...

I have managed to get into the cluster and the temperature seems to reach about 95c and hovver around there, does that mean anything?

Andy

This might help. I found it online many years ago.

http://i49.photobucket.com/albums/f2...psa260ed58.jpg

My memories are too "complicated" to publish here.

Cheers,

still having problems with heater fan.. heat comes out of vents when driving normally but when I put the fan on it blows warm when driving but then goes cool when slowing down, but if the fan is off then it still comes warm through the vents. i have had a new water valve from BMW and a FSR that was after market, could it be a faulty FSR? It does not blow much until it is on 100% full anyway... not sure if there is a possibility that I have a bad one.. Been in the garage for a few days and he cannot find the problem. Help please...

Non OEM FSR is always a suspect for fan problems, even when new. I still suspect air in the system. I would have a BMW specialist check everything in the cooling/heating system.
GL.