Question about 2001 Oldsmobile Alero
My alero (192,220 Miles - Runs good) has been overheating for the past couple of weeks (at least that's what the tempeture gage indicates) one day as driving I saw the temp. gage go over the half mark and then I clean the radiator by draining the old antifreeze and adding water with cleaner/flush adictive and refill with GM-Dexcool antifreeze, also I replaced the thermostat, the temp. sensor, but still the temp. gage was going over the half mark and I'd turn the heater so make it go down and it will be going up and down, but not up to the 3qt mark. a friend told me about the radiator fan relay not working properly, I turned on the engine and disconected the temp. sensor and noticed the fan did not start till about 5 mins. later, so I replaced the relay and repeat the same step (disconnecting the temp. sensor) this time the fan started after 5 secs. and the engine light went on, but seemed to be working fine (new thermostat, antifreeze, temp. sensor & relay) next day I went to work and found my car was overheating, but it will go up and down as if the radiator fan had a delay to start. then I repeated the step about disconecting the temp. sensor and this time the fan wouldn't start till after 5 mins. again. could it be an electrical problem? or should I have to replace both the temp sensor and the relay at the same time for one could be damaging the other.
I have an 02 olds alero (142000) the radiator fans are not working, therefore overheating. I have replaced the thermostat, water pump, coolant, what causes the fans not to work?
Posted on Mar 09, 2010
I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.
I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.
I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.
If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.
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Posted on Jan 02, 2017
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