How do I replace the blower motor on a 89 olds 98

Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.

It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.

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For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

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These will help.

Thanks.

Column shift tilt wheel:

Ciera '89, '90
Buick Century '89, '90
Chevrolet Celebrity '89, '90
Pontiac 6000 '89, '98

Column shift w/o tilt

Olds Ciera '89, '90
Buick Century '89, '90
Chevrolet Celebrity '89, '90
Pontiac 6000 '89, '90

Floor shift...same options. Tilt and/or no tilt is a matter of preference as the wiring harness is the same, so either will work. Floor shift is floor shift only,'89 and '90 Ciera, Century, Celebrity, 6000.

Hope this helped.

if you haven't got your blower fan fixed yet, im sure it to be the same as mine, the blower motor relay which is out on the firewall under the big fuse block. take plastic cover off over the fuses and move the fuse block out of the way and you will see it staight under that. should be two screws holding it on.

fusebox

It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift. Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps. 

might be behind the glove box or under hood on firewall

There is a fusible link for the blower motor. Check that. Don't know where it is. Look up the wiring diagram at autozone.com. Also check the fuse in the fuse box. Could just be that.

replace the blower speed control module located near the blower motor

Check the blower motor resistor. It could have a broken connection in it.

i've replaced three heater cores on a mustang, the only way to get to them is to remove the dashboard i believe the only way to get to the blower motor is the same way, located behind the glove compartment.