Overheating question on a 1999 Toyota Sienna?
I have a 1999 Toyota Sienna with 190,000 miles on it. Recently it has begun to overheat. I drive about two miles to work in the morning and am barely able to make it before the car starts to overheat. I have tried adding coolant. The heater doesn't blow hot air and the A/C only works intermittently and not for very long periods, blowing cold air for awhile and then blowing hot air. Any suggestions on what it might be? I don't hear a whining sound normally associated with a water pump. I thought possibly a thermostat but was looking to see if anyone had any other thoughts.
head gasket would usually be indicated with a mixing of coolant and oil, which isn't present.
The belts are in good shape as I had them replaced recently but the impeller or water pump sounds pretty close to right on. Thanks for your help!
One last question. Is the thermostat behind the water pump like they used to be in older cars (I haven't replaced one in awhile)? Would it be wise just to replace that while they're in there?
The car was serviced by the dealer at every recommended interval. Oil changed every 5,000 mi. I thank the ASE mechanic for his advice. I did a pressure check on the radiator yesterday and found that it had a hole. For those who were talking about maintenence...it has 190,000 miles. things are bound to happen to certain systems no matter how well you take care of them.