How do I replace the thermostat?

KNIGHTSMOTORSMOTORS

MEMBER
2003 LEXUS ES
12,400 MILES

The air conditioning works on this car, but when I turn it to the heat it blows out kind of warm air but not hot, I was going to change the thermostat to see if that helped and I have already check the coolant lvl and it's ok, but I dont no were the thermostat is, I had the coolant flush by the pro's so the thermostat was on next for my list please help me. I couldn't seem to find this diagrams that you should me, is there a way to tell if the thermostat is bad, and could you show me where it is at and how to change it thanks
Thanks, Clenton

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Hello,

Here is the thermostat location and instructions on how to change it.

INSTALL WATER INLET Torque: 8 Nm (82 kgf-cm, 71 inch lbs.)
INSTALL WATER INLET PIPE
Install a new O-ring to the water inlet pipe.
Apply soapy water to the O-ring.
Connect the water inlet pipe to the water inlet.
Install the bolt holding the water inlet pipe to the cylinder head. Torque: 20 Nm (204 kgf-cm, 15 ft. lbs.)

Here is a guide that will give you an idea on how to change it.

https://www.2carpros.com/articles/replace-thermostat

Check to make sure both heater hoses are hot when car warmed up. if they are then you have an actuator problem in the heater unit. it may also be your water valve isn't working right or the cable is broken. pic enclosed. i'm sending pic of hvac so you can see if air mix servo motor and air inlet servo motor are working.

https://www.2carpros.com/articles/car-heater-not-working

Check out the diagrams (Below)

Please let us know what you find.

Cheers

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Saturday, December 31st, 2011 AT 1:02 AM

KNIGHTSMOTORSMOTORS

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2 POSTS

Thanks for the diagrams and information after checking it out I found the thermostat has broken causing the heater not to work. Thanks for your help This site is great.

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Saturday, December 31st, 2011 AT 1:27 AM

HMAC300