Question about Cars & Trucks
Have had long time problem w/fans not coming on in my 97 Malibu 3.1 v6. Followed suggestions here, relays tested good, motors good...decided to bypass w/switch to run fan manually..it works, but keeps setting P1652...Wired switch into lead wire of fan2, power direct from battery..What GETS me? If the PCM is SMART enough to catch the change in voltage in this circuit, WHY CANT IT KNOW ENGINE IS TOO HOT & TURN ON THE DARN FANS?!?! I love my car, but this is getting ridiculous!! Note: DID find strange problem w/fuse/relay center BEFORE installing switch...Fan MODE relay 'socket' has 5 pins..polarity is reversed in 2 or more pins...not sure HOW the heck THIS realistically COULD happen? Any suggestions?
U need a data stream run on car that displays values for a tech to decyfer--code scanners dont cut it--factory equip at a private shop does----like the magicmechanic online--send him this issue
Posted on Nov 20, 2013
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Posted on Jan 02, 2017
The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.
OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.
2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.
Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.
Thank you for use fixya....
Posted on Sep 25, 2008
SOURCE: cooling fan relay 1998 neon
on the left(driver's) side of the lower rad support. It's a small flat relay with a plug on the bottom and usually has a blue colored front. held on by two screws. Also, there may be more rad fan relays in the underhood fuse/relay box.
Posted on Feb 27, 2009
SOURCE: cooling fan
Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.
Posted on Jul 22, 2009
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