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Old 05-17-2017, 02:10 PM   #1
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Default Cooling fan isn't kicking on

Hey guys. First post here.

So I've done a bit of work by myself on my 99 Pontiac Bonneville SE. Had Bonnie about 6 months. Done a couple oil changes, oil filters, new fuel filter, new tires, brakes, and things.
The AC bearing went out so I bought a delete pulley and in the process of removing the compressor hit the starter wires with my wrench and got a burn on my finger and blew one of the relays and MY RADIATOR FANS DON'T WORK.... Bought a new relay for 23 bucks and the fans won't kick on. Checked the fuses and they're all good.. bought a code reader and it shows me P1651 and P1652. I pulled one of the relays and hot wired it for the mean time. Meaning I have to connect the wire and unplug it Everytime I drive it so it doesn't kill my battery. The other relays under the hood are good. How do I get my fans to work again without bypassing anything?
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Old 05-17-2017, 03:46 PM   #2
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Are you sure they are not turning on? Low speed turns on at 212 and high speed(both fans) turn on at 226.
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Old 05-19-2017, 02:12 PM   #3
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Are you sure they are not turning on? Low speed turns on at 212 and high speed(both fans) turn on at 226.
I will check this later. Should I disconnect and reconnect the battery to maybe reset anything? Or just use the old working relay instead of the hot wire? I thought they were supposed to turn on at 200... I'll get it up to 240 and see what happens. I don't know a lot about cars... Just don't want to blow it up.
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Old 05-19-2017, 04:09 PM   #4
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If you disconnect the engine temp sensor, this should default the PCM to turn the fans on. It'* a safety feature should it not see engine temp anymore. If the fans turn on, then they should be working fine.
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Old 05-19-2017, 10:51 PM   #5
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It'* possible the fiddling and manually forcing fans on may have set the code too. I would intervene at 230 myself if the fans don't come on, because that means it has blown past both fan setpoints. The extra 10* probably won't kill it, but nothing would be accomplished by letting it go that far. Also, if only one fanspeed is working, this will become apparent too.
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