Take it to a place that handles gas... like a taxi joint or something like that... Spoke to a mate of mine who works on a tonne of cabs... laughed at me when I told him what people thought the problem was (no offence people, just saying it as it is) but then the smug prick would'nt say what the problem really was...

I modified the second stage of the thermostat as AU99 described. However, the car still has the same problem. I think it might not be such a bad idea to take it to a gas mechanic.

I will leave the thermostat as it is now though, because that seems to be a good way to go with LPG (rather than just a standard thermostat). The car does seem to run a bit better on gas when it's cold, so maybe there has been a positive outcome.

If I want to solve the problem, I will take your advice and take it to a gas mechanic to look specifically at that problem. Thanks again..

sorry I couldn't be of much help telling what it is.... As for the gas mechanic, go somewhere that has and does deal with a lot of taxi's, they know their s**t

Will keep that in mind... thankyou

please dont shoot me and i may have not read everrything in detail and i may waste ur time

but all this talk about coolant levels and thermostats not make sence

these tickford gas system problems happen at start up
so i would think the coolant system would not even be in use until the thermo stat opens releasing coolant around the motor then onto the gas mixer then onto the heater core

and i more question dont the tickford gas systems start of fuel for the 30sec after start up then auto switch over to gas

my car was having a problem with the gas freezing up...

i didnt know if it was the thermostat or not so i just completely removed the heater bypass valve (2nd stage thermostat) and now everything is good...