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Sedans Toyota Camry Older Camry Maintenance and Repair
558 messages, Last post on Nov 20, 2009 at 11:36 AM
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Hi, 4 weeks back my rad fan stayed on and won't stop even though the temp' outside is at minus point, it stop after 2 days, now it came back again, it start running when i turn the key to on ( without starting the engine ) and it stayed on after starting the engine ?? the temp' is below zero now and i don't think the rad fan should be on specially early morning when engine are cool?? hope it won't cause any damage to the car?? Please advise diagonistic and test?? any help will be greatly appreciated. Regards DIY-1 
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Replying to: diy_1 (Nov 30, 2007 8:12 pm) Normally, there are two things turning on the radiator fan. A temperature switch showing high coolant temperature, or the A/C clutch running.
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Replying to: kiawah (Dec 01, 2007 5:20 am) Thanks for your reply
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Replying to: diy_1 (Dec 01, 2007 9:17 am) Why did you replace the temperature switch last year? What symptoms were you having, and how did you determine the switch was bad?
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Replying to: kiawah (Dec 01, 2007 1:24 pm) Regards DIY-1
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Replying to: diy_1 (Dec 01, 2007 1:43 pm) Assuming the fan is stil running after pulling the wire to the temperature switch, then pull the Radiator Fan Relay #3. If the fan doesn't turn off, the the problem is your Radiator Fan Relay #1. If the fan does go off when you pull Relay#3, let me know....as we'll have to figure out whether the problem is in Relay#2 or Relay#3.
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Replying to: kiawah (Dec 01, 2007 1:57 pm) I pulled the wire to temp' swith not directly at the switch, but on top of the rad, there is another connector, connecting with the wire to the temp' switch. 2 wire in, 2 wire out. The fan still run, i pulled Rad' Fan Relay # 3, fan still run, then pull Relay # 2, fan # 2 goes off, then pull Relay # 1, Fan # 1 goes off?? I tried the same with Dash fan turn off, defroster & A/C turn off, same result?? do you think there is a ground broken somewhere ??  Thanks you so much for your patient. DIY-1
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Replying to: diy_1 (Dec 02, 2007 1:16 pm) The primary coil is on pins 1&2. 12V on pin #1, ground on pin#2. The secondary switched contact points are on pins 3&4. With pin 2 grounded, apply 12volts to pin 1, and verify that contact points are working correctly. Do not swap relay#1 with either of the other two relays. They are different.
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Replying to: kiawah (Dec 03, 2007 3:48 am) How do i apply 12V to pin 1 ?? sorry i am a newbie at this. Thanks DIY-1
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Replying to: diy_1 (Dec 03, 2007 9:24 pm) When you are doing that, you want the continuity meter (measuring ohms), to be measuring across 3 to 4. You should see the meter change from infinite resistance, to no resistance, to infinite resistance as you connect and disconnect the voltage on the primary. I'm expecting you will find that your ohm meter never goes to infinite resistance across 3/4. |
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