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| 1.0 93 Metro (with a 94 engine) overheats if idling for more than 10 minutes, stone cold if driving. | |
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| Tweet Topic Started: Nov 8 2017, 09:10 AM (152 Views) | |
| WalriePie | Nov 8 2017, 09:10 AM Post #1 |
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New Member
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So, I just got my 93 Geo Metro going again. What started as a water pump gasket turned into a new water pump, gasket, radiator, and new head gasket. Beyond happy to get it running again, and it's been making great mileage. Except that, 1. My radiator fan would not cut on, even when overheating. I said screw it and wire in a switch, and figure if I find the problem with the computer I can rewire it later. With the switch and turning on the fan before idling, no overheat at all. But 2. the engine will only reach operating temperature with the fan off and idling, and it just keeps going past normal operating to overheating if I don't turn on the radiator fan. Im fairly certain the thermostat must be stuck wide open for the trouble with coming up to temp, but I have no clue why it's overheating. Could it really just be as simple as the radiator fan not coming on, and as long as I stay prudent with that switch, and a new thermostat, I should be able to keep a stable operating temperature? Thanks in advance for the help guys. Once I get it running at a stable temp it will be time to move on to getting the heater to work.... That won't be fun haha. |
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| freegeo | Nov 8 2017, 09:46 AM Post #2 |
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The fan is not computer controlled. It uses a fan switch on the thermostat housing to activate the fan relay. It is a simple circuit. To check out why the fan doesn't come on use the link below for a procedure to test it. Look in section 08A-031 ELECTRICAL DIAGNOSIS COOLANT FANS. Wiring diagram on 1st page and use the fan does not run chart on page 7. http://geometroforum.com/topic/5044844/1/#new Have you checked to make sure once the thermostat opens you have coolant moving in the radiator, with the cap off? Edited by freegeo, Nov 8 2017, 09:47 AM.
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| freegeo | Nov 8 2017, 09:54 AM Post #3 |
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If by chance you need help finding the radiator fan switch use the link below. http://geometroforum.com/single/?p=3041548&t=8139950 |
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| Dystopiate666 | Nov 8 2017, 11:31 AM Post #4 |
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Tree Banger
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So with fan off and at idle, it comes up to temp normally, then if you manually kick your fan on it stays at a good temp? That sounds like normal operation to me.... I would test the thermostat before tearing it apart again....bring it up to temp and see if the upper hose gets hot as it reaches 180....an infrared thermometer is very handy for this....but you can literally feel the rush of hot water with your hand too |
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3:49 AM Jul 11