Removal of dummy waterpump

Tiny
TREVOR HOULT
  • MEMBER
  • 1991 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
I have a 1991 toyota 4runner and the dummy water pump has failed, and they cost heaps and was wondering if I could use 2-10inch thermo fans to replace clutch fan
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Friday, May 13th, 2011 AT 12:59 PM

15 Replies

Tiny
WRENCHTECH
  • EXPERT
No, that wouldn't work well. The viscous fan is thermostatically controlled through hydraulic solenoids for both temperature and A/C pressure. Electric fans would provide no thermostatic control nor a means to mount the drive belt. Repair the car the way it was built.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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Interesting idea. If the fan blades can be removed from pulley I dont see why not? You would just need some kind of thermo switch to activate fans automatically.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
WRENCHTECH
  • EXPERT
Temperature is only half the problem. The A/C inputs to the fan controls also.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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So you would just need feed from a/c signal to trigger fans? Maybe thru a relay tapped off the compressor clutch? Nothings impossible with determination?
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
WRENCHTECH
  • EXPERT
That would only give you a full on and full off and nothing regulated by the pressure. It could end up being too much fan at times.
I don't advise trying it. The old one still has to be usable enough to carry the belt.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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Do you think the fan speed option was added as a noise abatement issue like say when idling in a drive thru? In other words is it really necessary? Cant imagine what too much fan if thermo controlled would mean otherwise?
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
WRENCHTECH
  • EXPERT
It means a lot. Too much fan in cool weather will lower the A/C pressures too much and cause freeze up and compressor starvation. Most cars have the defrosters wired to run the compressor to remove moisture.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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That's probably the real reason. Cold weather freeze up when they added the moisture removal trick. Wonder when that all started?
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
TREVOR HOULT
  • MEMBER
The a/c runs of the ballancer pully so all I need is a thermostat switch to activate fans at temp
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
WRENCHTECH
  • EXPERT
No, that is not true. The A/C also interacts with the fan.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
TREVOR HOULT
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Please explain how as I have to do this mod as it is my only car and need it so want to cover all my basses as my last hope in getting part in not there anymore
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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Changing over does seem like a more complex job then just replacing bad water pump. I would hesitate to undertake such a project. I have been known to plug weep holes though to get a few extra miles out of a pump till funds were sufficient.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
TREVOR HOULT
  • MEMBER
Well job done but only need 1 10inch thermo pushes more than enough air around but I did need to get a good thermo fan switch other than that works well and heaps quieter and no a/c probs all works the same as it was before with a saving of around $800
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
WRENCHTECH
  • EXPERT
No, you don't know that you have no problems and you won't realize that you do until the day your A/C compressor seizes but you're not listening to anything you've been told anyway.
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Wednesday, April 29th, 2020 AT 10:34 AM
Tiny
FIXITMR
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Well, when cold weather arrives you may want to disconnect compressor electrically as a safeguard. Be neat if you posted a picture of the change you made.
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Wednesday, April 29th, 2020 AT 10:34 AM

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