'94 VW Golf spitting out coolant

[Phil N.]

Hi all. I have a '94 VW Golf 1.4 which is spitting out half of all it's coolant through the vent in the expansion tank when I'm driving on the open road. I've tried a lot of things to fix this problem and nothing has worked. Heres what I have checked so far�
1. I have changed out the radiator and the thermostat. 2. I have removed all hoses and checked for blockages. 3. When the car is idling the temp of the coolant reaches 92�, then the radiator fan comes on for 1 min, the temp of the coolant then drops to 88�. During this all hoses are very hot and the coolant level rises and falls in the expansion tank. 4. When I rev the engine hard from underneath the bonnet there is no sign of bubbles coming up through the coolant level in the expansion tank. There is also no sign of oil and coolant mixed in the engine. These signs tell me the head gasket is OK.
At present I'm driving without the thermostat to keep the temp of the engine down. The cooling system seems to working fine when the car is idling but is a complete nightmare when Im driving anywhere. Any help from any of you guys out there would be greatly received!! Phil.

[xantipants]

i had similar problem that drove me mad on an old golf and it turned out to be the expansion bottle. The plastic tank that you fill with water for cooling system has a small pipe coming out of it if you remove the pipe and then unblock the hole on the plastic tank that feeds small pipe which on mine was practically closed with scale.  Never had another problem after that.

[KebabMeister]

The coolant doesn't have to have oil in it for the headgasket to go.  It depends where the headgasket is broken - if it's onto the water jacket then combustion can enter the cooling system.

[Jay70]

It could also be the expansion tank's cap.  If this isn't sealing properly the the system wont be pressurised and the coolant will boil at 100 Deg C instaed of a higher temp.

[Phil N.]

Thanks guys for answering my Q. Much appreciated.

[gary2411]

could be you have an air lock inthe system might need the air taken out of the system try running it withthe rad cap off
and squeezing the bottom hose till all the air is out

[gary2411]

could be you have an air lock inthe system might need the air taken out of the system try running it withthe rad cap off
and squeezing the bottom hose till all the air is out and check the dipstick for oil and water