Temperature issue on Opel Frontera A Sport 1994 2.0 petrol

[ehe]

Hi there

I have once again decided to apply for the information to your outstanding forum, It's really very helpful, indeed and I hope you provide me with the usefull information this time too

Here is the question:

Can anybody advise me of the proper running temperature ranges of the Opel Frontera A sport 1994 2.0 petrol engine? I've been told, that the running temperature is 105 degrees by celsius!!!! How is it possible when water boiling temperature is 100 in the same units. I understand that cooling liquid is not only a water, but a diluted solution of an antifreeze, though, 105 seems like too high, doesn't it?

Now about the problems:

1. coolant boils in the espansion chamber, though temperature gauge doesn't indicate the excessive temperature ( overheating).

2. Upper rubber hose of the engine coolant, that is connected to the radiator, fall out from the nozzle of the radiator during driving.

I think because of the excessive pressure. But the strange thing is, that coolant temperature gauge didn't indicate overheating. The pointer of the gauge on the dashboard indicated the temperature between the last two white scale marks. In spite of this, water was boiling in the expansion chamber. I suppose, that the problem might be the malfunction of the lid valve (or it's diaphram) of the expansion chamber. Because as I remember from Physics lessons from a school the higher the pressure, the hire is boiling temperature of the liquid. So if the lid valve of the expansion chamber opens too early (doesn't build up proper pressure), that might be the reason of boiling coolant in the expansion chamber. To be honest, the coolant is very diluted, almost pure water. But if it's true this runs counter to my suggestion that the excessive pressure was the reason of falling out of rubber house of coolant.

An suggestions? Perhaps I'm totally wrong and problem is not there. But I'm pretty sure, that coolant shouldn't boil in the expansion chamber. I think to replace current coolant with much more concentrated one, perhaps it willn't boil.

I would appreciate any advices you provide me with

Thank you in advance

Shalva

[Frontmann]

Hello ehe,

where do You come from? Here we would like to know about you, before we solve your task

Potential as a leaky cylinder head gasket is the problem. This causes the pressure in the system cool strongly and it is open to the overpressure valve in the cap of the reservoir. The damage to the cylinder head gasket could clogged by a cooler or a defective thermostat have been caused.

The value of the temperature meter can be with the value of the temperature sensor for the engine control compared with a scan tool, and I note that the temperature meter displays rarely exact. Of course, boiling water, which is under pressure at temperatures above 100 ° C.

The closure of the reservoir opens at a pressure of 1.3 bar.

[ehe]

[Blitzo]

Hi ehe!

If Frontmann is right - and he is in most cases - it might be easier to detect traces of oil in the coolant inside the expansion chamber, than it is to detect water in the oil circuit.
Telling from my experience leakage of the cylinder head migth well show up only inside. In my case I could not tell by looking at the cylinder block only from the outside.
The order of changes you suggested seem to be a good idea to me.

[Frontmann]

the coolant don't must be mixed with oil, if the cylinder head gasked is demaged. You can test the leakage when you indicate CO2 in the Cooling system by a exhaust gas analizer or reaction ink.

[ehe]