THE RADIATOR FANS DO NOT WORK HOW CAN I CHECK THE SENORS

1999 Toyota Sienna

Tiny

JCROSBYMS

October, 11, 2011 AT 3:25 PM

I JUST REPLACED THE RADIATOR & THE VAN STARTED TO OVERHEAT AFTER FEW MIN. ON THE HWY AS SOON AS I OPENED THE HOOD I SAW THAT NETHIER OF TH DUAL FANS WERE WORKING AND THE RESOVIR BOTTLE WAS BUBBLING I CHECKED THE FUSES FOR THE FANS AND THEY ARE FINE

5 Answers

Tiny

Jacobandnickolas

October, 11, 2011 AT 4:07 PM

If it was overheating on the highway, the fans wouldn't have made a difference. There is another problem. I'm not saying the fans shouldn't have been on, but at highway speeds, the air flow through the radiator is more than the fans can produce. Have you replaced the thermostat? Also, with the engine cold, remove the radiator cap and start the engine. If coolant shoots from the radiator, chances are you have a bad head gasket.

Tiny

Docfixit

October, 11, 2011 AT 4:12 PM

Make sure wiring to fans is hooked up. Do fans run with AC on?

Tiny

KHLow2008

October, 11, 2011 AT 4:50 PM

Air in cooling system is the most common cause of overheating after repairs.

Was the system bleed of air after repairs?

Tiny

JCROSBYMS

October, 11, 2011 AT 6:05 PM

HOW DO I BLEED AIR FROM COOLING SYSTEM

Tiny

KHLow2008

October, 11, 2011 AT 6:28 PM

Top up coolant.
Turn heater to maximum.
Run engine for 5 minutes with radiator cap off.
Add coolant if necessary.
Stop engine.
Add coolant if necessary.
Start engine and if level does not drop, close radiator cap.
Run engine till operating temperature, radiator fan comes on.
Allow to cool and recheck coolant level.
Add coolant if necessary.
Repeat process if coolant level is very low when rechecking.

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