I'm confused haha. I thought we were talking about the radiator fan switch at the bottom of the radiator? Not T-stat haha. I did just replace radiator fan switch so far keeping temp in middle on gauge but only tried driving residential.

 

You mentioned the T-stat in your last post and hence replied with some info on the subject.

If the engine temp is OK now at residential with the temp switch replaced, then all should be well.

 

After replacing radiator fan switch on bottom of radiator I drained the antifreeze refilled it turned on heat on high waited till normal temperature was reached and then added a quarter of the expansion tank for the radiator drove the car around for a bit came back home and then a few hours later no antifreeze in expansion tank but radiator is full what's the problem?

 

Unless a leak its typical.

You need to add as much coolant as was drained out. One can drain out more then can be easily added back later due to air not coming out of the system. In the future, measure best you can what came out to know what went in.

Remove radiator cap (engine cold) and refill as needed with coolant to an inch or so below the top of the radiator fill hole. Squeeze the upper and lower radiator hoses to try to force out any air inside them. If air is being forced out, the coolant level will rise and could overflow. Thus the reason to not have the radiator filled to max. Once done top off radiator.

Refill coolant reservoir.

Drive around until engine hot then let it cool down. Recheck reservoir. If empty then recheck radiator and top off if required. Then refill reservoir.

Unless a leak or other issues the coolant level will stabilize.

 

So until it stabilizes I should keep filling coolant reservoir to full?
Btw when I replaced the radiator fan switch I drained the antifreeze and put it back. Is that ok?

 

Unless an unknown problem yes. Its very common for the reservoir to end up empty after a refill. One reason to take some precautions as stated.

Just don't let the temp gauge get near the red zone. Not stating it will do this here, but overheating can cause problems as started previously.

 

roughly how many times would I have to fill tank for it to stop emptying out?

BTW when I replaced the radiator fan switch I drained the radiator and put back the same antifreeze. Is that ok?

 

Needing to refill only time time is typically.

Your drain and refill procedure is fine.

 

What happened though is I filled the radiator then I filled the tank turned car on heat on til reached middle. Then I drove the car came back few hours later tank was empty not radiator. Radiator was fine. I'm confused

 

Check coolant level in radiator and top off if required. Fill reservoir. Go drive. Let engine cool down and recheck reservoir level.