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| Radiator Fan Tempurature Switch | |
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| Tweet Topic Started: Dec 18 2014, 10:20 PM (1,013 Views) | |
| oldskuwl | Dec 18 2014, 10:20 PM Post #1 |
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hi, I am wondering if anyone can help me. I have a '94 geo metro 1.0L base model hatchback with standard transmission. My radiator fan however does not work, in fact it never has (since I have owned the vehicle). I have checked all the fuses, they're all good. The tempurature gauge in the car works as it should too. I have checked the fan motor by hooking it up to a nine volt battery and it works. My hanes workshop manual says the next thing to check is the cooling fan tempurature switch, as I suspect that maybe where the fault lies. However I am having a little trouble identifying and locating the aforementioned switch. I suspect it may be connected to one of the electrical connectors I have marked in the attached photo, A, B or C. Please can someone help me? is it one of these? or all three? or am I wrong and its not even in the photo? I would really appreciate any help anyone could provide. I went to a local autoparts store, thinking I'll just get the part from them and then replace the matching part that was in the car, however the staff were unable to determine which one to get as several options are available on their system all at varying prices, so I didn't know which one to get. Thanks [IMG][URL=http://s74.photobucket.com/user/oldskewl99/media/engine_001.jpg.html] [/URL][/IMG]
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| DieselGeo | Dec 18 2014, 11:13 PM Post #2 |
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the fan switch is what you labeled "A" |
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| DieselGeo | Dec 18 2014, 11:19 PM Post #3 |
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testing is easy, pull the plug off, insert a jumper (paperclip works good) into the plug, turn your key to the "on" position and your fan should run. If you fan runs then either your sensor is bad or your thermostat isn't opening. If the fan does not turn on you have other issues, wiring, fuse, relay ect. Try this and let us know what happens. |
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| oldskuwl | Dec 19 2014, 08:43 PM Post #4 |
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Thanks DieselGeo for your help! Good news, today I tried the paperclip jumper and turned on the ignition and the fan worked! So I was all like great, its the tempurature switch. Went to the autoparts store, got the right replacement part. Changed the switches. Drove around for a WHILE, got the coolant tempurature up to operating level, pulled over to see if the fan was working. Sadly still no spin! So it seems i might have to replace the thermostat?? |
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| DieselGeo | Dec 20 2014, 12:27 AM Post #5 |
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my car usually will not activate the fan while I am driving it. If I let my car sit and idle (even in the winter) it will eventually get warm enough to kick the fan on. I'd give that a try and see if the fan comes on. You can also test your old switch by hooking up your mulimeter test leads to the two connections on the switch, set your multimeter to continuity and then hold the sensor end over a flame. once it gets warm enough you should hear the multimeter give you a constant beep after the switch completes the circuit. If it never beeps the switch is bad. |
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| DieselGeo | Dec 20 2014, 12:29 AM Post #6 |
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also, if your top radiator hose is as hot as your bottom hose then your thermostat should be opening and functioning properly. If its cold/er to the touch than the bottom hose than it is stuck shut and needs to be replaced. |
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| myredvert | Dec 20 2014, 07:24 AM Post #7 |
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myredvert
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If the temperature gauge appears to reach normal (or close to normal) operating temperature (~1/2 scale indicated) and doesn't indicate an overheating condition, its probably nothing to do with the thermostat. That and the switch and sensor is in the housing before the thermostat. If the thermostat was stuck closed, the temperature sensor and fan switch still see the higher temperature of the coolant from/in the block. What is your normal gauge indication when you are driving? 1/2? Lower? Its very possible it's just as DieselGeo described - that with colder outside temperatures the coolant just isn't getting hot enough to activate the fan. If the coolant doesn't reach 98C/208F, the fan won't be coming on. Once the outside temperature gets into the low 40s or lower, mine only comes on if it sits at idle for quite a while Was your fan coming on when it was warmer out? The (non XFi) thermostat switch should be rated at 98C/93C / (208F/199F) (ON/OFF), give or take a degree or so depending on brand. If you want to test your fan switch, the procedure in in the FSM in section 6B, cooling and radiator.
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| Old Man | Dec 20 2014, 09:27 AM Post #8 |
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My fan almost never comes on. My heat gage has to be near the red before the fan comes on. |
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| oldskuwl | Dec 23 2014, 01:54 PM Post #9 |
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Thank you everyone for all your help and advice! I really appreciate it! Going away for Christmas/New Year today so I shall see how the car goes when I get back. And maybe I should take it for a long drive out in the country and see if the fan turns on, rather than all the city driving I do. Anyways, Wishing everyone a very happy Christmas and all the best for the new year! |
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| sr98acr | Jun 27 2015, 05:02 PM Post #10 |
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Fresh Fish
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was this issue ever fixed |
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| Metromightymouse | Jun 28 2015, 02:32 AM Post #11 |
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Powdercoat Wizard
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Last time they logged on was Feb 4th so don't hold your breath for a response. Might start your own thread with your symptoms and see what assistance you can get. |
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Was your fan coming on when it was warmer out?

2:15 PM Jul 11