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Thread: 4AC thermostat - needed?

  1. #1
    Site Supporter Driftspec's Avatar
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    Default 4AC thermostat - needed?


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    Hi guys,

    Long story short, the old 4AC in my car has been intermittently overheating on longer drives. Not badly, but sometimes enough to get steam coming out of the overflow. Radiator seems fine, water pump and fan are working, the only thing I (and others who I've talked about it to) think that the thermostat is acting up.

    My question is, can I rip the sucker out and just let the water flow all the time? Or should I just replace it as soon as possible?

    Thanks lads.

  • #2
    Senior Member Matt-AE86's Avatar
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    If you are planning on removing the motor sometime soon, just remove the thermostat.

    If you are planning on using the 4AC for a while longer. Replace the thermostat and remplace the water pump if it hasn't been replaced recently. Even if you say it "works".

  • #3
    Site Supporter Driftspec's Avatar
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    I don't know if it work for sure, but there isn't any strange noises that suggest there is anything out of the ordinary.

    I will be running it for a while yet, so if it needs to be replaced I might as well pull it out and test it, rather than just rip it out and be done with it.

    I also need to identify my radiator, I'm a little confused as I always thought it was a standard, but Callum (deleta) looked at it one day and said it was a Skyline rad. So I will have to grab some pics and post them up, and use the brain trust here to help out. It has a radiator places sticker on it, so I know its 2nd hand or reconditioned, at the least. I'll try and grab pics tomorrow, if I get time :|

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    Elite rthy's Avatar
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    is it fwd or rwd? rwd dont have thermo stats?

    if u let the water flow that car wont keep operating temp, so id repalce it.
    just did mine cost $14 @ autoone
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    Site Supporter Driftspec's Avatar
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    RWD. 4AC in an ADM AE86.

    The engine has always run warm, so my line of thinking is that letting it run through isn't necessarily a bad thing. When I get time I will have to test it, and replace. Thanks for the price, hopefully its just that. If not... then its the pump or radiator. Woot.

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    Veteran Golberg's Avatar
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    Other thing to look at is whether your radiator is blocked up at all.

    And for rthy up there, just about all cars have thermostats, FWD or RWD. Its integrated into the pump housing on a RWD setup.

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    Elite rthy's Avatar
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    hmmm didnt find one when i took apart my old rwd 4ac water pump?
    any got pics of what it should look like?

    edit: nvm found it
    http://www.rollaclub.com/board/?showtopic=19896

    i guess my old ae71 4ac never had a thermo stat, i guess thats why it had problems getting to operating temp lols
    Last edited by rthy; 30th April 2009 at 11:29 PM.
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    Veteran Golberg's Avatar
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    Something like this:


    Its behind the bottom pump inlet, somebody may have got to it first though.

  • #9
    Veteran Jonny Rochester's Avatar
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    If you run no thermostate, or if it is stuck open, the engine can overheat on a longer drive.

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    Site Supporter Driftspec's Avatar
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    Thats what is happening Jonny, short drives are fine, but longer drives it gets hot. Being a 4AC, it doesn't lose any performance, but I think it will be staying in the car for a while now so I need it working well, to prevent other issues.

    The radiator was something thats probably worth replacing anyway, being fairly old. Like I said, I will need some help (when I get pics) to try and suss out what I have. Got prices and pics for replacement R32 and R33 rads today, if that is what I have already that would make a nice easy replacement. If not, might have to suss something else out.

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