Please help...overheating

Carguylen · Post by **Carguylen** » Mon Feb 20, 2006 9:15 am

My fan was only going on for a few seconds at a time, so I got a new fan relay switch. Put it in, and now the fan isn't going on at all...If I take the wire off, it stays on, so it works, but hooked up, it won't go on at all...Any ideas?
Thanks...

JOE · Post by **JOE** » Mon Feb 20, 2006 9:53 am

It most likely could be your thermo switch located in the bottom of
the radiator. I had the same problem with mine. I replaced that switch
as well as the one located near the top of the timing belt cover. All though that switch is for the temperature sending unit.

You are also better of going with Toyota OEM on those parts, because the jobber parts are crap. Figured that out after replacing the sending unit switch
4 times only to find out it fits other cars other than ours.

Anyway good luck.

Carguylen · Post by **Carguylen** » Mon Feb 20, 2006 10:21 am

I think my radiator might be clogged, when it was REAL hot, I unscrewed the drain, and the coolant was cool for about 15 seconds, then hot, so if it's cool there, it's probally not hot by the fan switch, right? What do you think?

takza · Post by **takza** » Tue Feb 21, 2006 3:41 am

I had two different fan switches on mine...one runs the fan a little more...the first one only ran it when idling off road in hot weather.

How are you determining that the engine is hot?

If by the gauge...the sending unit could be off....or even the gauge.

If it overheated in some way and you got cold coolant out of the rad...it's not circulating...thermostat?

Check the engine temp by running the heater...if you get real hot air...you've got a hot engine.

Carguylen · Post by **Carguylen** » Tue Feb 21, 2006 7:20 am

I've got hot air coming out of the heater, and the car doesn't overheat if I unplug the fan and it runs all the time. That's why I thought it might be the lower part of the radiator clogged. If the thermostat was no good, it would overheat even with the fan on all the time, right?

takza · Post by **takza** » Wed Feb 22, 2006 6:08 am

Depends on the outside temps. Even in summer my fan doesn't run much.

Not sure why you think your car is overheating.....

In winter it's possible for the coolant in the rad to freeze while driving the car...one more reason to use antifreeze.