BMW E39 1998 with 2.8L LPG Engine - Excessive Cooling System Pressure Causing Component Damage

Hello everyone, I have a problem with a good E39 from 1998. The engine is "reliable" 2.8 L assisted by LPG . Well, there is too much pressure in the cooling system - damaging every now and then new elements of the system. Driving like nothing is happening - the temperature tip "stands" in the middle. After a few hours (4-6h), unscrew the cork - the geyser from the fluid up. Currently, after replacing the radiator (in the previous one it burst the tank), water pumps, several hoses, and I replaced the cork with the original one. Currently there is a bulge on the reservoir of fluid next to the radiator and so you should expect another replacement ... I will add that the car was properly vented and the mechanic did not find any signs of exhaust fumes. Sometimes I can skip 800km to cool the car and after 4 hours, unscrew the stopper and it is light "psst" and no "geyser" then the next day passing the distance, eg. 10 km, unscrew after the same time and crashes the liquid. There were 3 mechanics in the car - none of them can determine exactly what is wrong. Do you have any idea?

You have. They burn the exhaust to the fluid, even though the mechanic did not find it, or the engine, however, works at a much higher temperature than the indicator shows. Did you create a new or used cooler?

I exchanged for the used - original - 100% ok - the cooler came with a car on wheels which went into demolition for parts. Well, but with exhaust gases in the system there is probably no chance to make such long distances? and how do you explain the inability to detect them in the system when testing CO2?

maylo wrote:

Well, but with exhaust gases in the system there is probably no chance to make such long distances

For me the indicator is yellow, and yet I normally ride. And how do you explain it? Please check the actual engine temperature with an independent thermometer, we will know what we are talking about.

Most 1.9 TDI pd series A that the VAG stable has this problem. I would put a pressure gauge and check what is actually the pressure in the system, especially after driving with the gas pedal in the floor. Puki releases a little cork, it manages to drop the excess. Then he spits liquid and the liquid slowly disappears. In the last phase of the exhaust there are so many that the cork can not keep up and the weakest part in the system, eg hoses, heater, radiator, falls. Some add liquid and continue after tens of thousands of miles while driving peacefully and looking for a hole in the cooling system. So that the 99 percent cap up and a new gasket.

In the case of this motor and these symptoms it is rather a cap up and no cracked used in its place.

The diagnosis is always the same - the head for removing and replacing the gasket or head ... what if the problem remains after replacing these elements?

Initially, devoting a few hours and a few liters of mountains managed to find a problem - at the moment in the testing phase.

Well, the problem probably turned out to be ... leaky evaporator, pumping gas into the cooling system .. because after unscrewing the radiator cap and raising the revs to about 3000 you could feel a distinct smell of gas from the equalizing reservoir.

Currently, I burned the gas that was in the system and drive with a twisted valve on the cylinder and in the mode "PB MODE" after the whirl in the wallet no leaks, squeeze snakes (previously swollen to the limit) in the morning lack of geyser after cooling down. If nothing happens - the evaporator to be replaced.

I'll let you know about the results

So the Magic reducer is there?