I'm in the same boat: Try reading all pages on these links:
http://townhall-talk.edmunds.com/direct/view/.f15850c/0
http://forums.automobilemag.com/70/6248778/Toyota/2002-toyota-highlander-problems/index.html
this one has photos how to do the repair:
http://www.tundrasolutions.com/forums/highlander/32217-heater-quit-sort-of/
The block heater in a Toyota Highlander can be reached by going through the left wheel-well, toward the drive shaft. It is seated in a hole in front of the rear drive shaft, and can be seen clearly from underneath the vehicle.
Toyota Highlander was created in 2000.
I have Toyota 2l-T engine the problem is the oil blowing on the exhaust is this the turbo charger problem?
The 2004 Toyota Highlander is 15'5" long.
where is the starter in toyota highlander 2003
This engine is known for having a sludge problem. Toyota extended the warranty for 7 years (total). I don't know if this caused your problem but you may want to look into reimbursement from Toyota if sludge was the cause.
there is a short somewhere in dash or heater, you need to fix that to stop fuses blowing
SUV from Toyota
The 2002 Toyota Highlander has 16 valves.
The 2014 Toyota Highlander has 16 valves.
The 2010 Toyota Highlander has 16 valves.
The 2009 Toyota Highlander has 16 valves.