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According to my reference, there was no 2004 Toyota Yaris but there is a 2004 Toyota Echo. (The Yaris replaced the Echo in 2006). See sources and related links below.
Pretty sure its the same as the 2000 Toyota echo, see related link.
INSIDE THE HEATER BOX BEHIND THE GLOVE COMPARTMENT.
The install is difficult because insert hole is on driver's side, closest to firewall. The Toyota dealer charges $150 for part and install. Canadian Tire charges less than $100 (both less tax) Part is same. Install time charged at CT in Westbank, BC was 1/2 hour and part was $46. Routed cord myself. Heater is not inserted inside block but is clipped in place to heat the outside of the block.
How to open hood on Toyota echo
because before they were not dim The heater could be drawing too much power or your alternator isn't producing enough.
yes
If you are asking if you can tow with a Toyota echo, the answer is yes. See related link for a video of a Toyota Echo towing a small trailer (and off roading).
2001 Toyota Echo doesn't have a timing belt.
1. Hold down the "AM" button until you hear a beep. 2. Use buttons "1" and "2" to set the clock. This works on a 2004 Toyota Echo with CD player "32809" (Australia)
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html