Bmw lpg with heater blowing hot and cold

Qwandy · #1 03-04-2013, 04:53 PM

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

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Zulu95 · #2 03-04-2013, 05:17 PM

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,

Qwandy · #3 03-04-2013, 05:22 PM

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.

Zulu95 · #4 03-04-2013, 06:18 PM

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.

Qwandy · #5 03-05-2013, 02:39 PM

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

Zulu95 · #6 03-05-2013, 06:03 PM

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

My memories are too "complicated" to publish here.

Cheers,

Qwandy · #7 03-31-2013, 06:23 AM

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...

Zulu95 · #8 03-31-2013, 09:34 AM

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.

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