Cascade Crew

GREG DAVIDSON · Posted: Sat Nov 21, 2009 1:43 pm Post subject: cooling fan question

my cooling fan can on lastnight while driving it and it wont shut off now i had to find the plug for it and unplug it to get it to shut off, any idea what i need to fix ? the temp gauge kinda worked when it wanted to so im thinking i may need a new sending unit ? would that cause the fan itself to stay on ?
oh and this is on my Daytona 2.2 btw

Twilightoptics · Posted: Sat Nov 21, 2009 1:57 pm Post subject:

Sounds like the relay stayed open. Fan gets battery power straight from the relay so if the relay stays on, the fan stays on.

Or the key on power/ecm power to the relay is staying on for some reason.

Sounds like relay

GREG DAVIDSON · Posted: Sat Nov 21, 2009 1:59 pm Post subject:

ok i'll have to see if i can find it , its been a few years since i've worked on one of these

Outlaw28 · Posted: Sat Nov 21, 2009 2:14 pm Post subject:

just go buy an aftermarket one off summit...i think the one i bought was 20bucks works great easy to install comes with all the hardware and its adjustable

aaron_sK · Posted: Sat Nov 21, 2009 2:14 pm Post subject:

Assuming it's a standard four-wire relay, you should be able to quickly test if the trigger has both 12V and ground. If not, it's a bad relay as Paul mentioned. If they do, then think faulty sending unit grounding out, or something along those lines. I'm not sure if Mopar ran switched 12V, or switched ground to trigger the relay.

GREG DAVIDSON · Posted: Sat Nov 21, 2009 4:19 pm Post subject:

whent out and plugged the fan back in, yep fan kicked on so i found the relays on the fender well, started tapping on them with a wrench one by on and magically the fan shut off Rolling Eyes

NAPA is the only one to have it on hand. seems to be there the place to go for relays, switches and sending units here in salem that was the situation for the firebird i had before, the parts houses down here are kinda full of idiots. Rolling Eyes

aaron_sK · Posted: Sat Nov 21, 2009 4:22 pm Post subject:

GREG DAVIDSON · Posted: Sat Nov 21, 2009 4:27 pm Post subject:

aaron_sK · Posted: Sat Nov 21, 2009 4:30 pm Post subject:

His car in particular, no. Razz

A good DSM should be able to handle the average 305 car pretty easily though.

GREG DAVIDSON · Posted: Sat Nov 21, 2009 4:34 pm Post subject:

not going to deny that.. i still kinda want a 1995-1999 tsi,gsx or even a gst , but im happy with the 4 cylinder i have its a nice slate to work with i hope once i get my bird done the daytona will be pushing some nice hp

iansane · Posted: Sat Nov 21, 2009 11:38 pm Post subject:

91camaro_rs · Posted: Sat Nov 21, 2009 11:50 pm Post subject:

after i did my timing chain my fan wouldnt go off either, funny thing is that once i replaced the CTS sensor, it turned off, idk if those two things are related at all but it worked

GREG DAVIDSON · Posted: Sat Nov 21, 2009 11:55 pm Post subject:

i'll get both when i get the cash to change them. i drove a bit today the fan seems to be turning on and off on its own hoping its good till weds.

oh and on a side note for the guys that go junk yard surfing could you please keep an eye out for a drivers side fender for me please. i cant find one down here sombody kicked it in just before i bought the car

aaron_sK · Posted: Sun Nov 22, 2009 1:11 am Post subject:

Twilightoptics · Posted: Sun Nov 22, 2009 11:48 am Post subject:

If the cts shorts to ground the fan will only come on when they key is on.

91camaro_rs · Posted: Sun Nov 22, 2009 12:29 pm Post subject:

or if you cant plug it in cause the plug on it snapped like mine Laughing

chevymad · Posted: Sun Nov 22, 2009 1:01 pm Post subject:

Greg was talking about his dodge. The ECM controls the cooling fan. An open in the CTS circuit or disconnecting the CTS will turn the cooling fan on. That shouldnt happen with the key off though. So if the fan continued to run after the key is off then its most likely the relay sticking.

Twilightoptics · Posted: Sun Nov 22, 2009 2:56 pm Post subject:

chevymad · Posted: Sun Nov 22, 2009 4:53 pm Post subject:

Heheh.. remember how you time one? You disconnect the cts.. and then the computer goes into limp mode, fan comes on, and you can set the timing. The fan coming on is what the texts tell you to listen for before trying to time it.

Twilightoptics · Posted: Sun Nov 22, 2009 5:37 pm Post subject:

Don't recall having timed one. And missed the Dodge bit in the first post. Razz