Hello NICO members. Ill just jump right into it; recently bought a 94 convertible for my wife and needless to say the car was neglected and needed a little tune up. The first thing me and a friend did was change the water, thermostat, water pump, rad cap, and temp sensor. The water was just plain water/goop so we figured we need to change all of it at the same time to be on the safe side. couple days later she said she could smell coolant. found out it was losing about a cup of water a day. so we keep filling it back up; then a week later white smoke out the exhaust.
Changed the head gasket using many forums on NiCO. everything is back together did an oil change, filled up the radiator with just regular water (for now), started it up and no more smoke out the exhaust
. start to burp the system after reading "how to" on here. everything was going good and car had warmed up to operating temperature and i had a funnel over the rad i kept full with water. I had been going at it for 20 mins letting all the air out, all of the sudden i hear the ac fan kick on and the water starts over flowing over the funnel. i check my temp inside the car and it reads normal (3rd notch). i turn the car off and all the water in the funnel instantly gets sucked back into the rad.
the last thing i need is the car overheating again and doing more damage.
What could cause this? i asked a few people around here they said bad thermostat so i took it out today tested it in boiling water it opened and 20 long mins later it started closing when the water started to cool. so im lost... any help would be great!