Overheating / Slow (broken) fan?

[MordyT]

I have another 94 Toyota Camry V6 Japanese Model at my shop right now for repair. It has had the following repairs:

2 Water Pumps
2 Thermostats with Gaskets

And it still overheats. I noticed that the fan is slow – so slow that I can stop it with my hand and hold it. I can even count the fan blades.
I understand that there is an ECU, control valves, pump, motor, cooler, and the filter.
I am unsure how to figure out what is causing the low fan speed.
I am not sure if it is relevant, but the power steering works fine. Reason I mention this is because the fan is powered by hydraulic fluid from the pump. However, I do believe that there are 2 separate parts to this pump? One part for the steering and one for the fan so this may not be a good indicator.

I obviously don’t want to start ripping apart the system trying to figure it out by replacing everything one at a time, so I am asking if anyone knows a quick way to figure out which part is at fault – Pump, valve, controller, etc.

[samarai912]

what kind of motor is it? strange that its not an electric fan. havent heard of this before. let me know. what kind of system are you using? alldata? mitchell?

[lee777]

Does it overheat at highway speeds, when there is lots of air movement?
If so, could be radiator. Is the rad original?

[MordyT]

Originally Posted by samarai912

what kind of motor is it? strange that its not an electric fan. havent heard of this before. let me know. what kind of system are you using? alldata? mitchell?

I use mitchell 5.8. As for the fan I will agree that it is strange that it is hydrolic powered but on my own personal car and it has the same config except the fan works. I don't know what you mean by motor - there is a line with power steering fluid to the fan.

Originally Posted by lee777

Does it overheat at highway speeds, when there is lots of air movement?
If so, could be radiator. Is the rad original?

I guess it is time for a roadtrip on the highway.

[MordyT]

Originally Posted by lee777

Does it overheat at highway speeds, when there is lots of air movement?
If so, could be radiator. Is the rad original?

It looks like the radiator was replaced. I didn't have time to roadtest it on the highway but from the sticker on it, its apparent that the rad was replaced within the past year.

Any ideas.

[the_professional]

Originally Posted by samarai912

what kind of motor is it? strange that its not an electric fan. havent heard of this before. let me know. what kind of system are you using? alldata? mitchell?

its not really rare, the hydraulic fan was the standard fan for the 92-93 V6 models, wierd it ended up on a '94 though. It's more of a pain to service but, when its running it does its job well. That being said, it should be moving quite faster.

When does your overheating occur, if it only occurs at idle & stop & go, its prolly your fan, but if you have this issue at highway speeds its something else, I not sure what if you replaced your water pump recently.

^^
NVM i should of read more closely.

if the thermostats were replaced & the pumps, Im kinda lost.

[chronoti]

wow, well. the fan impeller, is worn, take the fan hydrological motor apart and you see the blades of the impeller have worn down or the impeller bearings allowing the fluid to pass by and not really turn the impeller. the fan is prolly just turning right now because of the flow of the current around the impeller.

that or the hose is clogged.

[Bdub215]

Power steering pump. drives the fan so if its not putting out like it should be i'd look there. @ the_professional the hydraulic was on ALL camry v6/es300 between 92-96.

[chronoti]

nope wrong i have a 96 electric fans. it was mainly only the 3vz but there were a few stragglers that made it in to the 94 years. you know left over parts like how a few 96 have the serviceable struts.

[Bdub215]

Originally Posted by chronoti

nope wrong i have a 96 electric fans. it was mainly only the 3vz but there were a few stragglers that made it in to the 94 years. you know left over parts like how a few 96 have the serviceable struts.

my 95 es300 had it so it couldnt have stopped at 94

[davemac2]

From what I've heard, these hydraulic fans rarely fail. You want to make sure that there is suffcient fluid in the PS reservoir, because when the fan circuit kicks on, it will suck a lot of fluid from that. You can try to manually activate the fan high/low solenoid at the PS pump by removing its connector and applying power directly and see what the fan does. (I think shorting
OP1 and E1 on the data link connector under the hood near the passenger fender will do the same thing.)

You can also check hydraulic pressure on the fan circuit I would imagine by removing the high pressure line at the top of the hydraulic fan motor and inserting a pressure gauge inline with it there. You will need some type of banjo fitting adapter to go onto the high pressure hose. (Pressure should be 140-280 PSI @2000RPM I think with high speed enabled?) From the Toyota manual, it does appear that the PS and fan hydraulic flows are totally separate, so it may be possible for the fan side to suffer a pressure loss from the pump and not the PS side?

Another alternative: ditch the hydraulic fan and replcae it with an electric one somehow.

dave mc

[bronzemaxell]

Originally Posted by Bdub215

my 95 es300 had it so it couldnt have stopped at 94

my camry 94 v6 LE has hydraulic radiator fan as well, as soon as the engine starts, the fan runs, but at a very low speed, just one big fan, i noticed my 93 camry, 2.2L radiator has two eletric fans though, and the electric fan won't run until the radiator is above normal temperature range.

[the_professional]

I don't know, I've worked on '95 & '96 V6's with electric fans, I can't be 100% sure about '94s.