Cars overheating forgot to put anti freeze in car. the only prob this seemed to cause was the heater quit. now after fitting new thermostat the engines over heating, and the water is bubbling back out of the radiator resoviour(sp). losing no water anywhere else, no smell of petrol in radiator res., so hopefull its not the head gasket. any ideas?

You may have an air lock in the radiator after putting the anti freeze back in the car or feel the heater hoses and see if they are circulating water, they should be hot to the feel. I am not sure what is going on with the fan switch.

First of all, Alysa, that's not nearly enough information. The most common causes of engine overheating are: leaking hoses, radiator leaks, heater core leaks, a failed water pump, thermostat leak, freeze plugs leak, automatic transmission oil cooler leak and (I hope not for your sake) a cracked block or cylinder heads. Make sure you have the radiator filled with the proper amount and ratio of water and anti-freeze. Simply dumping more anti-freeze in there won't help. Check for leaks and check the thermostat before doing anything. Hope this helps. . .

problems with heaters not working can generally be traced back to the control module for the vents and heater

you may have a air pocket and it needs to be bleed. check and see if both heater core hoses are getting hot

it prob isnt the heater core usually when that goes u blow antifreeze steam into cab from heater vents. prob water pump or pin hole in radiator line if from the front of the engine or bad gaskets or bad freeze plugs if from the rear also check ur thermostat to make sure it working prop because u could simply be blowing out ur over flow line cause **** is plugged an over heating

Check for the following causes:

• Insufficient coolant - i. e., not enough to permit flow in the heater core.
  
• Anti-freeze concentration (too much water will allow the liquid to freeze in the radiator, heater core or hoses). This can also cause engine overheating.
• Collapsed hose to heater core (check both hoses).
  
• Bad thermostat on engine.
• Heater blower not working.
• Heater door not opening.
  

Sounds like you've got either a cracked head or blown head gasket now; this will give you your poor performance. As for what caused the overheating in the first place; you need to check out. Water pumps commonly go out, allowing the antifreeze to leak out, causing your overheating, or even heater cores. Once you got it hot, it warps the head, and blows the head gasket. More than likely, you also have white smoke coming from the exhaust, especially when you first start it for the day. The biggest worry, is if your head is warped too much, and if you have excess blow-by from the piston rings losing their strength from getting too hot.

check your fan clutch. chances are its worn out not allowing for sufficient air to be pulled through the core of the radiator.

YOU COULD HAVE A BLOWN HEAD GASKET, MOST REPAIR SHOPS CAN DO A BLOCK TEST WHICH WILL TELL YOU IF HEAD GASKET IS BAD, ALSO CHECK TAIL PIPE FOR WHITE COLOR SMOKE.

I would have the cooling fan checked, and have the thermostat changed. An overheated thermostat (overheating caused by something else) will cause problems in the future.