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2003 Toyota highlander heats only on drivers side. Its full…

Customer Question
2003 Toyota highlander heats...

2003 Toyota highlander heats only on drivers side

Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses?

Yes its full no leaks

Mechanic's Assistant: Are you fixing your Highlander yourself? What have you tried so far?

Fixed wire on control , looking for flap for passenger side

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Yes,when I have heat on face drivers side works well passenger side by window blows cold

Submitted: 1 month ago.Category: Toyota
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Answered in 4 hours by:
1/9/2018
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 1 month ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,606
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

You could have a few different things going on. If you have a dual zone system then you could have a bad actuator or broken door, possibly an actuator wiring or module issue. With either a single or dual zone system you could have a restricted heater core.

Do you have a single or dual zone system?

Does the air on the right side warm at all?

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Customer reply replied 1 month ago
The middle vent Heats a little the outside by the window on the passenger side blows cold the it is a single it is a single zone system
Toyota Mechanic: sprinkles08, ASE Certified Technician replied 1 month ago

If it's a single zone system then you have just one blend door. This is happening because the heater core is restricted. You can try flushing the heater core directly, alternating until the water runs clear in both directions. You can also use something such as The Works toilet bowl cleaner, letting it sit in the heater core for approximately five minutes before flushing. THe entire cooling system may also need to be flushed and the heater core may need to be replaced or a permanent repair.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

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sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,606
23,606 Satisfied Customers
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

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