Electric radiator fan not turning on

JONNYB_2010

MEMBER
2000 JEEP GRAND CHEROKEE LAREDO
4.0L
6 CYL
4WD
AUTOMATIC
180,000 MILES

I have replace the relay once already and the coolant temperature sensor. The fan motor itself is turning on with direct power and its resistance is 2.6 ohms so its only drawing about 5 amps. I just recently replaced the pcm due to another issue but the fan didn't work before that anyways. Any ideas?

7 Replies

HMAC300

MECHANIC
48,601 POSTS

Check the ground and check if there is a good connection at relay. The pcm controls this so also check connection at ect. See if the relay is sending power to fan it may be a broken or chafed wire as well.

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Thursday, December 3rd, 2015 AT 6:25 AM

JONNYB_2010

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5 POSTS

Ground read.5 ohms. The grey power wire 12 Volts. The green wire to the pcm read 5-6 volts when car was running and a/c turned on. Is it possible for that control wire to be shorting out and that would be why I am not see the 12v it should have

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Thursday, December 3rd, 2015 AT 6:54 AM

HMAC300

MECHANIC
48,601 POSTS

I fyou looked at the drawing I sent it shows the green wire going to fan not pcm. It shold have 12 volts. It may be a chafed wire or a bad connection at relay, make sure they are good then put dielectric grease on it for a better connection.

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Thursday, December 3rd, 2015 AT 6:58 AM

JONNYB_2010

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5 POSTS

There are two green wires on the relay. The first one is the control wire and the second goes to the fan motor

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Thursday, December 3rd, 2015 AT 7:22 AM

JONNYB_2010

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5 POSTS

I just thought I should be seeing 12v from the control wire. I probably have a shorted wire somewhere I will just have to pull the battery tray and trace the wires.