Djcocker

So a small amount of research has lead me to suspect that the problem is likely caused by the fan impeller motor. The fan on the back of the radiator spins but has almost no power behind it. It can be stopped and held in place with a finger. The radiator was replaced in the last two years. I had intended to replace the thermostat but it turned out to be somewhat inaccessible and a bigger job than first thought. Is there any way to test the function of the thermostat without removing it from the motor? Is the fan supposed to be spinning faster or with more power than that? At times I have noticed the coolant bubbling into and then out of the overflow container as steam. The coolant loss is not large on any particular occasion, something in the range of a centimetre or two below the top of the radiator every 2-3 weeks. The engine has been pressure tested recently so it is unlikely to be a cracked head gasket. Any ideas would be appreciated. Thanks guys.

I have a 1994 V6 Camry Vienta that overheats on occasion. This will only occur when the car has been idling for a considerable period, maybe 20+ minutes (as in heavy small city traffic), and is particularly likely on warm to hot days (25 degrees+). In addition there is considerable coolant loss through the overflow reservoir much of the time. I have received some advice that this is likely to be caused by a faulty radiator thermostat but I am seeking confirmation on the likelihood of this issue before embarking on a costly repair. Also any advice on the best place to source a replacement part would be much appreciated.