Technical Cooling fans not working
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Technical Cooling fans not working
This is true but if the thermostat is working and the temperature gauge is close to red and you can’t even touch the radiator hoses then surely the thermo switch should be hot enough
We do not have hands calibrated to degrees c and we are all different . For instance I can comfortably hold hot dinner plates that other people would drop because far too hot for them.
It's just guessing at temp.
Plus we don't know how accurate vehicle temp gauge is.
I’ve been a welder all my life I can handle hot stuff believe me. It’s definitely getting hot enough.
I’m just gona have to suffer flicking on and of a switch or two on long steep hills.
On a side note and anyone tell me what this terminal without a connection on it is for in attached photo I have seen a photo on the internet of one with a blanking cap on it so maybe not needed.
Any advise would be appreciated
Many thanks
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You could attach your thermo switch to wiring, put switch in pan of water heated by portable stove. If water boils and fans don't come on(have ignition on) then you know switch is faulty. Or get an infra red thermometer so there is no guessing of temperature.
I tried that with new one before I installed.
No fans came on
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Did you look at the wiring continuity?
Communicator
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See post #1.
Yes I checked wiring continuity.
Not sure if my van has an ecu but wandering if it does could the wire to the ecu be broken?
Any advice would be appreciated
Thanks
Try it with old one. New one clearly faulty if in water that is in water on a rolling boil.
Considering if you bridge connector contacts the fan runs. If wiring is intact and correct.
Find the wiring diagram for your specific model.....
I doubt an eye is involved with your 1992/3 model , be thankful of that
Communicator
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1.9TD is not an electronically controlled common rail engine, so no ECU.
As you must have a collection of thermostats by now, could you post a photo of one, so that we are clear as to what we are discussing? I am thinking about a three terminal device, fitted into the radiator header tank, which will be on the side with a crossflow radiator. As you suggest that fan has never worked correctly, is there any possibility of an incorrect connection at the connector? You still be able to apply a short to the connector and operate the fans, but in one scenario you would need to be over second fan cut in temp before any thing would happen via thermostat. This would require crossed wiring at the connector. I do not see how this could happen.
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Communicator
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Yes that is what I am thinking about, but somehow swap fan 2, and earth connections by whatever means and nothing will start until temp for second fan is reached, and than both will start. UNLIKELY but possible.
I begining to think that ther is some confusion here. We have wax thermostat for engine coolant system, as shown in photo post #20. and electrical thermostatic switch to control the fans. I expected that this latter device that was to be tested in hot water.
The op states he tested new thermo switch by putting it in water that was boiling on a stove but did not read continuity between any of the terminals-to me that indicates a faulty new switch. Though it takes a minute or two for switch to heat saturate for contacts to close.
Definitely worth attaching wires to old thermo switch and testing in water that is boiling on a hob.
The op sensibly removed and tested the thermostat for full opening and posted a photo.
Seems to be a very strange situation indeed
Tested all wiring and relays they are all fine
3 pin switch, one terminal is earth one it to one fan and one is to the other.
Fans didn’t work on old switch when van was really hot i.e almost on red
Tested old switch in pan on hob and works fine
tested thermostat
Changed switch, drove van until it was definitely over 90 degrees, tested for continuity at new switch and nothing so clearly not hot enough at switch
But every car/van I have ever owned has never went up to red on temperature gauge without being a problem.
In post 26 I suggested attaching old switch to vehicle wiring, dangling it in pan of water and heating water to boiling and seeing if fans come on(vehicle ignition may need to be on to power fans)......
You stated you did this, I'm thinking maybe you didn't understand and did something else.
You stated you did this, I'm thinking maybe you didn't understand and did something else.
No I did exactly that I’m afraid pal
did you try that with old or new switch?
If it was new switch in boiling water whilst connected to vehicle wiring, with ignition on, would say the new switch is duff, as when you bridge contacts in vehicle connector the fans run.
It is a puzzle.
Heating in water while connected to vehicle wiring in situe could be the key here.
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