[Solved] VW Golf 4 1.6 16V 2000: Thermostat Issue, Engine Not Warming Up, Radiator Hoses & Fan Gears

Hello, I have a problem that the engine did not warm up in my Golf. I bought a new thermostat, cost PLN 34, it turned out that it does not open at all and the water boiled, I bought a new one (cost PLN 45), I also bought a temperature sensor in the head and a thermo-switch for fans in the radiator, now the car runs, but the temperature hint can be lifted up to 90C. and the upper hose from the radiator is very hot, and the hose that goes from the thermostat is cold, the same after driving about 20 km. I would like to add that I checked the fans briefly and only 2nd gear works, that is to the max, because as I waited for the system to vent, the fans did not turn on even once. I am asking for advice.

I do not know about you, but in Poland it is very hard to vent, so maybe try to vent better
Ps. You didn't boil it by accident?

rather, it is well vented because it walked for a good 25 minutes, the first time and the first thermostat, the water boiled but maybe for 2 seconds and I immediately turned off the engine. Later I bought the second thermostat and so far only the bottom cold hose.

And you checked the water pump

I think the water pump is good because the car drives all the time, after replacing the thermostat, such actions ...

Kubool96 wrote:

rather it is vented well because it walked a good 25 minutes

Did he set the air circulation to the maximum warm during venting?

Kubool96 wrote:

I bought a new thermostat for PLN 34

First of all, did you look if you have a damaged thermostat bumper in the middle of the housing?

that's how I set it to warm air to the max

RADU23 wrote:

Did he set the air circulation to the maximum warm during venting?

No matter G4 has no valve on the circuit, only mixing flaps, the heater is always hot.

yes i have a good thermostat housing.

Added after 1 [minutes]:

I think to try tomorrow if the car's heating is turned off, the hose will get warm inside.

Kubool96 wrote:

yes i have a good thermostat housing.

Have you looked inside or not ripped out?

Yes. is like new

the problem was solved, it turned out that the water was not boiling, only the pressure released it from the tank because I checked it on the unscrewed tank, after turning on the tank the fans turned on, greetings!