overheating ....

[dstlaurent]

Hi guys .... i have read all the thread about overheating but ... no good answeer ... i show you a resume of my car ...

3VZ-FE
1993
221 000 km
new head gasket
new computer temperature sensor
A/C Filled up

The symptom: when i drive (city) and i put the A/C on, my fan continue to turn at "idle" speed and the temperature gauge go in 3/4 zone ... and the fan not go faster ...

You have suggestion ?!

- Solenoid valve ?
- Fan computer ?

thank you!!!

Dâ

[BlueFusion6851]

Temperature sending unit, OR (this happened to us btw) iron deposites in your coolant, which retain heat, rather than dissipate. You may need a coolant flush. I would take it to a Toyota dealership and have them troubleshoot what may be wrong.

[chronoti]

or the ac fan isnt running fast enought, also the temp sensor that on the rad isnt good and turning on the rad fan

[camry93]

I have the same car 93 V6 LE with 230K and had a overheating problem it turned out to be the radiator. I had the origional rad still in mine which in my opion was too small for a car with AC. I put in a double core rad and the problem was fixed. Long life coolant breaks down over time and actually clogs the rad.

[dstlaurent]

The coolant is new ... and is not the radiator because the fan keeping the "idle" speed ... i think the problem is in the fan control ... because, before heating, the fan is suppose to run more fast ...

thanks

[Toysrme]

Open the diagnostics port and bridge E1 & OP1. The fan will go into the higher speed. Then turn the air on and check.



I got news for you man, you've got other problems. The fan being off and the A/C on will not make a 3vz-fe go into the higher portions of the temp gauge. Probably a plugged cooling system, maybe a bad water pump. Flush the entire thing out.

[camry93]

Is the rad origional? If it is you should replace it after 12+ years of service, new coolant will not help if the rad is all crudded up inside. I am assuming you have the hydraulic cooling fan on your car?

[dstlaurent]

Hellu, i make a bridge with the E1 and OP1 and the fan don't turn at a higher speed ... ac on and off.

Yes is the original radiator, but the coolant is new. and the wather pump is new too ... i think the problem is in the fan circuit ....

[Redline]

hey toysrme...didn't you help me out with the same problem a while back? same overheating problem....I think you told me check out the water temp sensor and something else. Damn, I can't find the thread.

dstlaurent: check the coolant/water temp sensor. If you had overheating problems prior to changing to new head gaskets, it may have affected the sensor, causing it to read faulty temp readings. Get that changed. If it's not the water temp sensor, try the solenoid (since your Camry has a hydraulically driven rad fan). One last thing....does your car have a tendancy to "overheat" even with the A/C off? Will the guage read 3/4 overheat while idling in traffic, but not go any higher? If you have these symptoms, it may be exactly the same problem my Camry had a while back. I got the water temp sensor changed.

Hope that helps

Redline

[dstlaurent]

YEs, i have change the water temp sensor (computer). And i think the problem is the solenoid ... because the bridge E1/OP1 have no effect ...

Where is this F****NG solenoid ??? it's hard to change?

[dstlaurent]

PROBLEM SOLVED!!!!!

When my Toyota dealer has changed my head gasket, the mecanician have not re-plugged the solenoid power cable (two yellow wire). I have plugged it ... and WOW! a great fan sound

thanks you all !!!!

[Toysrme]

Bump

Where was that at for future refferance?

[Toysrme]

Because this has come up several times for a few people since this thread came up.


Here is the solenoid / plug. It connects into the top of the powersteering pump.



Close up





From the access in the passanger's wheel well.





Only electrical thing there... Yellow wire w' blue strip is + voltage from the cooling fan ECU yellow wire is the - return to the cooling fan ECU.

[dstlaurent]

exactly