Where would i find the relay for the blower moter. the fan dont shut off even with the key off 02 bonneville

i will now read the online service manual to you.
https://eautorepair.net/Marketing/Default.asp

blower fan located where. dash heater blower fails
or radiator fans of some odd kind added later.
coolant fan or dash? there are 2 coolant fans and 3 relays to run them and all 3 relays, can fail and coolant fans blow for ever and ever. fuse 6 kills the relay coils. only, so if relay is welded fans blow endlessly. even if bcm is removed from the car.
on the other and the heater blower is 100% controlled by the BCM

so car engine starts and runs and drives ok right.
when did car last run perfectly> , or seen ever ?
service manuals for 88 cars are not easy to find
means real oem manuals, best. 35 years old !
no digital then ,just a huge paper bound book, remember?
holy moly this 88' has a body controller here, bcm , relic amazing thing.
facts: 1988
here is proof

Hi. have a look in the owners manual and see if it lists the blower relay, You poss have burnt contacts in the relay wich will cause it to stick. Jon

More than likely it's the blower motor resistor. Gm's wonderful electrical engineers decided it was a good idea to run constant power to the high speed fan relay which is part of the resistor assembly. When the relay stick the fan stays on. The resistor is located under the dash on the passenger side ne'er the blower motor. There is a plastic trim pannel that will need to be removed from under the dash in order to see it. It is typically help in place with two screws that you will need a 5.5mm socket to remove (yes it's a 5.5mm socket). Lmk

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Hello leebarker
The blower moter switch or the blower moter controler can cause this
problem. Remove the plug from the switch, use a 12v test light to locate
the 12v power wire in the plug. Next with a small jumper wire bring power from the 12v contact to the low and medium speed contacts on
the plug if the blower changes speed replace the switch if it still only
has high replace the controler. The blower controler is located on the
passenger side end of the heat-a/c box near the blower moter.
By the way the key must be in the on position for this test.
I hope this helps. Good luck.

You replaced the blower control module or the blower control panel on the dash? This has automatic temp control right?

ther is a blower moter resisterthat controls speeds;that burns out that is comon

sounds just like the relay is stuck

check blower motor regulator for moisture and corrosion on connectors

it sounds to me like your blower moter resister or your blower moter switch are going bad both are right under the hood next to the blower moter one has 2 witers on it the other has 4 it usuley on the pass side right near the window

i know this can happen on hyundais and i suggest completly disconecting the battery for 5 minutes then reconnecting this resets the entire computer system