Hello, I’ve already been looking for a lot here, but unfortunately not everything. History: The Ka (built in 97/98) of my wife got hot. So hot that he threw out all his cooling water. The lamp didn’t work (Why not? Where does the signal come from?). Just so out of the blue. The car was in the workshop and they thought after they had changed the thermostat (? – she should pay 80 euros for material and working hours) (without order) that the They tap on the cylinder head. Then I looked at the car. It is neither water in the oil nor bubbling it in the water tank. The oil is also clean. No smear in it. Also, it does not pour out water over the exhaust. Doesn’t look like cylinder head, does it? After about 20 minutes in idle neither the cooler warm nor the hose of the large cooling circuit. Were ice cold. So rather water pump or yet the thermostat (what did they then have in the workshop On suspicion I changed the water pump today and got the thermostat out. By the way: That was a fun. Somehow my tool was not compatible with the measurements of the case. Is this all ENG! And then without a stage or pit. Funny is different. After that the entire cooling circuit became normal hot again. Sure without thermostat. Now my questions: The heating does not get warm. Is probably at the missing thermostat. Tomorrow I test with. Although you can also speed it up via the small hose on the thermostat housing. I will do it. What worries me: Even after 20 minutes in idle mode (sleeps and coolers were hot – it was hot outside) the radiator fan still didn’t run. Is this also due to the lack of thermostat? The hoses were not stone hard, so not under pressure. How can I test the fan? Had read something that you can bridge the relay, but I get the fuse box. How does the fan get its signal? Which sensor measures where the temperature? Is there an image for this? How can I test the fan? Just juice on it? And can you easily change the sensor? I’m really grateful for every tip or diagnosis. I screwed on the Ka for the first time today. And I don’t think for the last time. Greetings Markus