ibuddler

Hello, can someone please help me to find the NO.1 ECT (Engine coolant temperature) switch part number? I can't find it online.

Thanks!

ibuddler

Will it be 8942833020?

LeX2K

1-wire is for the gauge cluster, 2-wire for the engine computer, bottom of rad for the fans.
https://www.japan-parts.eu/lexus/us/...relay-computer

89428-41010 is the one you're asking about.

ibuddler

There're 89427 and 89428 and even for 89428 there're 8942833020 and 8942841010. Don't know which one should I buy.

ibuddler

Thank you so much! 8942841010 Is that one goes to the radiator bottom of the passenger side?

ibuddler

8942833020
VS

8942841010

The connectors are different. When I take a look at the other side (the one above the FAN2 on the driver side), it looks like 8942833020 type of connector.

LeX2K

89428-33020 is the radiator switch. As for Rockauto I find their sensor listings sketchy you'll probably get the right part but the pictures are not necessarily correct.

ibuddler

Thanks! So I should buy 89428-33020? Is the radiator switch same as ECT switch No1? From the service manual I guess so. But when I called the dealer, they told me it's 8942841010. Right now I'm very confused lol.

Also a side question, if my fans aren't on and I'm driving high way most of the time, will it be all right? What I found is if I drive on the high way, the temperature is at about 1/3 level. Only if stop and run, it will be above 1/2.

LeX2K

Actual name in the parts listing
SWITCH, TEMPERATURE DETECT, NO.2 89428-33020
This is on the bottom of the radiator.

Sounds like you also need a thermostat the needle shouldn't move at all whether you are going fast or idling in traffic. Fans won't run at highway speed. Buy 90916-A3003 genuine thermostat not aftermarket.

ibuddler

In my case, fun runs when the AC on. I did some diagnoses and found out the SW NO1 is bad. I'll replace that one first.