Please I need your recommendation on the the Thermostart to buy as a replacement for my 1999 Toyota Sienna with a V6 engine. It was shipped from Baltimore (US). From what i can gather from discussion in this forum this might be what I need. I had my mechanic change it once but it worsened the problem that i had to ask him to reverse the changes he had made.

Dotng,
Your problem started because of the change of Thermostat. If you read through your owner's manual, Toyota gave a standing intruction 'that irrespective of the country of use, do not tamper with the thermostat'. Some mechanics would tell you to change it because Nigeria is a tropical country. But the car manufacturer has taken that into consideration hence, they tell you that the Thermostat helps cool the engine in an extreme weather condition.

It would be advisable for you to tell your mechanic to reverse it if he can or get smone competent enough to do it. This done, your car will get back to good old days.

bravolad:

Dotng,
Your problem started because of the change of Thermostat. If you read through your owner's manual, Toyota gave a standing intruction 'that irrespective of the country of use, do not tamper with the thermostat'. Some mechanics would tell you to change it because Nigeria is a tropical country. But the car manufacturer has taken that into consideration hence, they tell you that the Thermostat helps cool the engine in an extreme weather condition.

It would be advisable for you to tell your mechanic to reverse it if he can or get smone competent enough to do it. This done, your car will get back to good old days.

Actually, I had the overheating problem first that was why I asked the mechanic to change it. I had driven my sienna for over 8hrs with brief stops before i noted the temperature gauge had climaxed. I am suspecting that the mechanic replaced the thermostat with a spare that he had because the moment he did, the sienna overheats after driving for 15mins or so. I had to be filling the vehicle with water after it cooled down thrice before i took it back to him for him to reverse the changes he had made. Yesterday, I decided to add coolant to the radiator. one of the problems i noticed also that also happened this morning was that when I checked the water reserve compartment it was empty! It has happened a couple of times and the ground will not be wet.

i tink u have a bad gasket.change it.

Thanks Kunle-A,
I have checked the engine oil and it is normal. I had my rewire work on my fan yesterday. so that it will blow at the speed at which it works when AC is switched on. it normally works a slower speed but i thought increasing its speed might be a better trick. The relay was also looked into ( I guess). So i think the only thing left for me is to look for a Toyota Dealership where I can get thermostat. Thanks

the solution to your problem cost peanuts.But first replace the thermostat that came with the car,.
I have helped a few people solve this problem.

pls dont let anyone touch that car without a scan tool. scan for dtc and examine PIDs FIRST[color=#990000][/color]