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Old 05-02-2012, 12:54 PM   #1
SOLFOOD94
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Icon2 99 civic fan relay

My radiator fan wont turn on. Just replaced the fan and the relay under the hood. With a jumper wire jumping in the relay socket the fan came on a stayed on non stop even with the car off and key out. Anything else i should be checking? let me know HT!
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Old 05-03-2012, 05:16 AM   #2
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Default Re: 99 civic fan relay

???
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Old 05-03-2012, 05:40 AM   #3
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Default Re: 99 civic fan relay

did you check the fan switch?
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Old 05-03-2012, 06:05 AM   #4
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Default Re: 99 civic fan relay

The sender that is on the tstat housing? If so yes
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Old 05-03-2012, 06:28 AM   #5
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Default Re: 99 civic fan relay

Unplug the switch and then short the 2P connector with a jumper wire. Does the fan now run?
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Old 05-03-2012, 08:46 AM   #6
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Default Re: 99 civic fan relay

With the key on and the the sensor plug jumped no it does not run
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Old 05-03-2012, 08:49 AM   #7
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Default Re: 99 civic fan relay

Check whether fuse 17 or 57 is blown.
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Old 05-03-2012, 09:23 AM   #8
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Default Re: 99 civic fan relay

Is there a fuse diagram because i have the panel cover but no locator diagram
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Old 05-03-2012, 09:46 AM   #9
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Default Re: 99 civic fan relay

See FAQs sticky
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Old 05-03-2012, 10:55 AM   #10
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Default Re: 99 civic fan relay

What does that mean? Im new
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Old 05-03-2012, 10:56 AM   #11
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Default Re: 99 civic fan relay

Click FAQs in my signature.
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Old 05-03-2012, 11:17 AM   #12
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Default Re: 99 civic fan relay

Super helpful man. Unfortunately no blown fuses. How many sensors or switches are involved with the temp/fan. Because all of a suden my temp guage will work and then if i turn the key on again i wont. But this car has been like this forever. Im fixing alot of rigged up **** everyday. b20b in a 99hx ek coupe
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Old 05-03-2012, 11:41 AM   #13
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Default Re: 99 civic fan relay

Unplug the 2P connector on the fan switch. With the key in ON(II), does the green wire terminal have battery voltage to body ground?
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Old 05-03-2012, 11:43 AM   #14
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Default Re: 99 civic fan relay

Quote:
Originally Posted by SOLFOOD94 View Post
Because all of a suden my temp guage will work and then if i turn the key on again i wont. But this car has been like this forever.
The 1-wire temp sending unit is located below the distributor. Unplug it. Clean the connector and sending unit of oil and then fully seat the connector back on the unit.
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Old 05-03-2012, 03:04 PM   #15
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Default Re: 99 civic fan relay

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The 1-wire temp sending unit is located below the distributor. Unplug it. Clean the connector and sending unit of oil and then fully seat the connector back on the unit.
The casing around the end of the connector is torn back so i rewired it and cleaned it. Now when you say does it have power meaning turn the key on and test for power with a test light grounding it to the body??
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Old 05-03-2012, 03:37 PM   #16
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Default Re: 99 civic fan relay

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Originally Posted by SOLFOOD94 View Post
Now when you say does it have power meaning turn the key on and test for power with a test light grounding it to the body??
That will work.
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Old 05-03-2012, 05:47 PM   #17
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Default Re: 99 civic fan relay

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That will work.
Ok i will check the 2p connector in the morning i know that have jumped that connector and installed a new relay an the fan still wont come on by itself
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Old 05-04-2012, 08:34 AM   #18
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Default Re: 99 civic fan relay

Ok ron i grounded the test light to the body and turned the key on and no power to the green wire in the 2p connector. So just to be certian i grounded the test light to the negative on the battery and still no power?
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Old 05-04-2012, 08:54 AM   #19
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Default Re: 99 civic fan relay

With the key in ON(II), now test whether the both top test tabs of 7.5A dash fuse 17 have battery voltage to body ground. Click the fuses link in my signature.

Click the image to open in full size.
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Old 05-04-2012, 09:20 AM   #20
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Default Re: 99 civic fan relay

What do you mean by both? Like check the top of the fuse or the cavity that holds the fuse or both?
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Old 05-04-2012, 10:01 AM   #21
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Default Re: 99 civic fan relay

Quote:
Originally Posted by SOLFOOD94 View Post
What do you mean by both? Like check the top of the fuse or the cavity that holds the fuse or both?
Quote:
Originally Posted by RonJ@HT View Post
Click the Test Fuses link in my signature.
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Old 05-04-2012, 11:23 AM   #22
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Default Re: 99 civic fan relay

Ok i checked it out. The #17 fuse has a 20 amp fuse in its place. I checked the fuse itself and it has power through it. So i pulled the fuse and check the cavity that holds the fuse and the top slot does not have power but the bottom does wiht the key on.
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Old 05-04-2012, 11:33 AM   #23
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Default Re: 99 civic fan relay

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I checked the fuse itself and it has power through it.
Just to be clear, are you saying that both top test tabs of installed fuse 17 have battery voltage? If so, now check whether the fan relay in the hood fuse box gets voltage from the Blk/Yel wire via fuse 17.

Also install the proper 7.5A fuse in the #17 slot.
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Old 05-04-2012, 12:22 PM   #24
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Default Re: 99 civic fan relay

Fuse port 17 the top tob has no power only the bottom tab of port 17.
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Old 05-04-2012, 12:26 PM   #25
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Default Re: 99 civic fan relay

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Fuse port 17 the top tob has no power only the bottom tab of port 17.
If you did this^ voltage test with the fuse installed in the dash fuse box, then the fuse is blown. Did you click the link in my signature?
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