i got a 91 rs 305 tbi/ so today(rather cold day barley got above freezing) the car started to over heat after a 15 min drive. i didnt think much of it since it didnt go too high and i didnt let it warm up. 5 hours later i start the car up let it heat up for 10 min and drive it home. so after 15 min of driving it gets into red and lucky i just arrived home. i turn the car off and the resivor is bubbling with coolant. i wanted for car to cool down checked radiator and it was full theresivor was too. so could this be the thermostat or somthing bigger?

 

Off the top of my head....bad thermostat, bad water pump, plugged radiator or your fan isn't kicking on. Check your fuses/relay for the fan and make sure it's turning on then go from there. Water pumps usually let go with no warning.

 

i would make sure there is enough coolant. in a climate that cold it is not circulating coolant. also look at the thermostat. heck man replace it there cheap.

 

yea it was the thermostat i just wanted to make sure tht was the problem it runs fine now tho tnx for the help