today i finally got around to swapping my radiator into my car. after that the system was running good drove about 30 miles than on my way home on the park way it over heated. the temp almost rose all the way so i let it cool down. i checked the fluid tank and it was bone dry. so i topped it off all the way. made it home and it is OK. so i checked the tank again at home and their was the same amount of coolant in it as to when i filled it. also i was running the heater on high for the whole time and lost heat before i stopped. for the rest of the drive home it was blowing cold. what do you guys think it was. because it was a leak than why is their the same amount of coolant in the tank. or is it the thermostat.
It could also mean that you have a leak somewhere. Try cleaning everything up and let it warm up to full operating temperature and see if you could see any leaks. If you don't, drive maybe one block or so stop and open up the hood to see if you have a leak. Check to make sure all the hoses and lines are connected properly.
I had the worst experience with overheating in my 91 240sx. I was new to cars at this time. Car started overheating -> I replaced the thermostat, didn't work so I replaced it again because I have heard of them coming bad from the manufacturer. When that didn't work I just started throwing parts at it (water pump, radiator) because then I was too stuborn to take the car in to the shop. Finally took it in, they replaced the thermostat (despite the fact I told them I had done that twice) and told me it was good. Car overheats again, take to another shop, they claim they fix it... Overheats again. So one day I rev it hard in the driveway and see white smoke out the back. Burning coolant, why could the shops not find this? We just swapped the motor because a local J/Y had a KA24DE for 500 bucks with proven good compression. Sorry it's kind of off topic, but it was madness...