Radiator fan won't shut off!?!

J

jared_blown5.0

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Dec 27, 2005

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Mar 30, 2009

#1

• Mar 30, 2009

• #1

Just started yesterday the radiator fan wont shut off unless I disconnect the battery. The keys can be out even and the high speed fan will still be on. All grounds are attached and fuses are checked. I am assuming the the CCRM is faulty and will need to be replaced or I am probably going to install a switch with led indicator to bypass it. Let me know if you have any other suggestions or ideas.
-Jared

 

lazy_stang

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Mar 22, 2009

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Mar 30, 2009

#2

• Mar 30, 2009

• #2

could the coolant temp sensor cause this

 

J

jared_blown5.0

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Dec 27, 2005

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Mar 30, 2009

#3

• Mar 30, 2009

• #3

I am not sure? It stays on high speed even when keys are out of the car and locked. Only shuts off if I pull the fuse or disconnect the battery.

 

ProKiller

Founding Member

Apr 26, 2002

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Mar 30, 2009

#4

• Mar 30, 2009

• #4

it started this all by itself or were you working on it then it started?

 

J

jared_blown5.0

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Dec 27, 2005

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Mar 30, 2009

#5

• Mar 30, 2009

• #5

MY regulator went on my old alternator at end of season last year. Pulled it out 2 days ago and when I started it the fan came on and stayed on, also the wipers turned on and washer fluid sprayed out without being commanded to do so. Replaced the alternator and charging system was good then but still the fan problem being on still persists and wipers dont work at all now but the sqirts do work tho.
-Jared

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Mar 31, 2009

#6

• Mar 31, 2009

• #6

The latched HEDF relay idea is a good one. The relays dont receive power to their coils unless the key is on.

Though not your issue, do be sure you reconnected the ECT (if it was disco'd for the alt swap).

At the CCRM, with the car off but fan running (be careful of the fan blade, moving parts, and all that) Check:

CCRM Pin 13 for twelve volts. You should NOT have it.
CCRM Pin 17 for continuity to ground. You should not have it.

CCRM pins 6,7, 3, and 4 will all probably show 12 volts as well.

If 13 and 17 are cold but the fan is on, the relay probably latched. If 13 and 17 are active, that's a new set of testing (your EEC relay might be latched). Post if that's so and we can run those pins.

Good luck.

 

J

jared_blown5.0

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Dec 27, 2005

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Apr 1, 2009

#7

• Apr 1, 2009

• #7

I will try that tommarow and keep you guys updated.. .Thanks especilly to hissin.

 

J

jared_blown5.0

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Apr 4, 2009

#8

• Apr 4, 2009

• #8

Update:

It urns out thanks to help from JT that the low speed fan is the one that comes on at all times. As it turns out it was in fact the CCRM low speed fan relay that lached and stuck closed running continous power through it. Just wanted to update you guys and thanks for all the help.
-Jared