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I think a general rule of thumb would be about 150,000 miles, but personally I would only change it if there is a problem. A problem will be indicated by small leaks which should be obvious (you will see coolant on the ground and coolant levels declining), or by the pump making a lot of noise. If the temperature malfunction light comes on however, you should stop driving the car.
Changing out your water pump on your own is a very difficult job with the Echo, see other answers for how it is done, but I recommend you pay a professional to do it. The cost should be around $300 for parts and labor (the pump itself is a $25-$40 part). It can take several hours to complete this job.
What else can I help you with?
Will a 2000 Toyota Echo belt fit a 2001 Toyota Echo?
yes
Where is the gas filter on a 2001 Toyota Echo?
In the gas tank. I have 2001 Echo.
Digram timing belt Toyota Echo 01?
2001 Toyota Echo doesn't have a timing belt.
Download Toyota Echo 2001 manual?
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
How do you change engine oil 2001 Toyota Echo?
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
Oil capacity 2001 Toyota Echo?
3.5 Liters
Does the 2001 Toyota Echo have a timing belt or chain?
timing chain.
What should the tire pressure be on a 2001 Toyota Echo?
32 PSI
How do you change the front brake on 2001 echo Toyota?
see link
What mileage does a 2002 Toyota Echo get?
i have a 2001 and it gets about 39-42 mpg
How do you replace front wheel bearings on a 2001 Toyota Echo?
go to dealer
How do you change alt belt on 2001 Toyota Echo?
See related link
