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96 geo metro. cooling fan don't work.
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Timthecarguy719
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Apr 1, 2011, 7:05 PM
Post #1 of 32
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96 geo metro. cooling fan don't work.
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The fan on this 96 metro doesn't come on.
The relay is fine, the fan motor is fine, ECT sensor new, fues fine.
If the unplug the ECT the fan comes rite on.
What could be the problem?
I was told it could be a ECM problem.
Thanks very much.
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Tom Greenleaf
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Apr 2, 2011, 2:15 AM
Post #2 of 32
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Re: 96 geo metro. cooling fan don't work.
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The fan can come on so that rules out the motor I hope. If this has A/C will fan just plain run. I think it should just stay on, on this car with A/C and possibly defrost request. Can you please spell out ECT so I don't make a mistake with the acronym? Not sure why it would run with that unplugged and what else it might impact to leave it out and fan running till we can nail this down?
T
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Hammer Time
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Apr 2, 2011, 4:21 AM
Post #3 of 32
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Re: 96 geo metro. cooling fan don't work.
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If the fan runs when the CTS is unplugged, that proves the PCM has control of the fan and the circuit is working. The fan isn't programmed to come on until 208 degrees so it may just not be hot enough for the fan to come on.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 1:05 PM
Post #4 of 32
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Re: 96 geo metro. cooling fan don't work.
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I have a 180 degree thermostat in it.
208 is kinda hot no?
I just thought about buying one of those aftermartket fan thermostat systems from JEGS performance.
You can adjust the temp setting on that too It's like $28 bucks.
I'll probably just do that.
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Hammer Time
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Apr 2, 2011, 1:12 PM
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Re: 96 geo metro. cooling fan don't work.
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That's one of the worst ideas I ever heard.
The car engineered to run at those temps and you're going to totally screw up the fuel mixture. The car is supposed to have a 195 T-stat and the fan isn't supposed to come on until 208. That's nothing. Some of the other GMs are 227 and higher. Stop screwing with what isn't broken.
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Timthecarguy719
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Apr 2, 2011, 1:17 PM
Post #6 of 32
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Re: 96 geo metro. cooling fan don't work.
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The car from the factory came with a 195 degree thermostat.
I like my cars to run as cool as they can.
the fricken car over heated and i had to rebuild the topend because of it not working. Rite now i just have it hard wired to a switch for now.
(This post was edited by Timthecarguy719 on Apr 3, 2011, 8:43 PM)
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Timthecarguy719
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Apr 2, 2011, 1:18 PM
Post #7 of 32
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Re: 96 geo metro. cooling fan don't work.
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E.C.T is Engine coolant temp sensor.
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Hammer Time
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Apr 2, 2011, 1:22 PM
Post #8 of 32
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Re: 96 geo metro. cooling fan don't work.
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That car is engineered to run between 195 and 210. If you try to change that, you are going to screw up a whole bunch on things in the computer. If you want your cars to run that cold, then go buy a 1970's car. This one is not supposed to run that cool.
If you have some other problem causing it to go higher than that, then find the cause of it but don't try to make it run below 190.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 1:28 PM
Post #9 of 32
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Re: 96 geo metro. cooling fan don't work.
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It has everything coolant related brand new.
I'm just scared to plug the Fan back in and have it not come on and over head the engine again.
What is i put the coolant temp sensor in a pot of water thats hot enough and turn the key on?
Will that tell me if it's working rite or not?
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Hammer Time
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Apr 2, 2011, 1:32 PM
Post #10 of 32
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Re: 96 geo metro. cooling fan don't work.
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You don't even need a fan if the car is moving. The only time it even needs one is when it has an extended period of idling or slow traffic and then is supposed to get a little hotter. You have a temp gauge. If it doesn't go in the red, it doesn't have a problem. As long as the fan kicks in by 210 and it's capable of bringing the temp down, all is OK. If the fan comes on and the temp continues to rise, then you have another issue somewhere.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 1:35 PM
Post #11 of 32
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Re: 96 geo metro. cooling fan don't work.
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Ok, But will what i said in the last message work for testing the system?
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Hammer Time
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Apr 2, 2011, 1:39 PM
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Re: 96 geo metro. cooling fan don't work.
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That's not going to tell you anything. You need a scan tool to see what the computer sees and a laser thermometer to see the actual engine temp. The scan tool will also tell you when the fan is requested.
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Timthecarguy719
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Apr 2, 2011, 1:43 PM
Post #13 of 32
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Re: 96 geo metro. cooling fan don't work.
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My scanner said 158 degrees after it running for probably close to an hour at 57mph.
My scanner isn't that fancy to tell me all the other stuff, It just does codes, monitor information and freeze frame information.
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Hammer Time
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Apr 2, 2011, 1:46 PM
Post #14 of 32
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Re: 96 geo metro. cooling fan don't work.
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Use a laser thermometer on the thermostat housing to verify the computer temp reading and see if the sensor is accurate.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 1:48 PM
Post #15 of 32
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Re: 96 geo metro. cooling fan don't work.
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I don't have one.
But i do have temp thingy on my multimeter will that work you think?
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Timthecarguy719
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Apr 2, 2011, 2:24 PM
Post #16 of 32
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Re: 96 geo metro. cooling fan don't work.
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I just got a reading of 106 degees on my multimeter.
My scan tool wont do a freeze frame unless i drive it.
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Timthecarguy719
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Apr 2, 2011, 2:52 PM
Post #17 of 32
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Re: 96 geo metro. cooling fan don't work.
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Just letting you know you were rite!
I guess i need to not be scared to let it get a little hot.
It got up around 3/4 the way on the temp gauge then it kicked on for a few seconds then off.
I'm very happy! Thanks a bunch!
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Tom Greenleaf
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Apr 2, 2011, 4:57 PM
Post #18 of 32
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Re: 96 geo metro. cooling fan don't work.
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If temp gauge fluctuated a lot I don't think that all right. If not done I'd consider flushing it out and not to exceed 50/50 antifreeze. Some will on some cars and be normal but most don't much.
You can get a clue if you really are overheating if the heater quits! It won't throw heat with boiling coolant, it must be a liquid,
T
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Hammer Time
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Apr 2, 2011, 5:36 PM
Post #19 of 32
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Re: 96 geo metro. cooling fan don't work.
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He doesn't have a problem Tom. He's thinking old school.
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Timthecarguy719
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Apr 2, 2011, 6:15 PM
Post #20 of 32
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Re: 96 geo metro. cooling fan don't work.
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Ya got that rite!
I'm very old school when it comes to cars.
I never had a car newer then a 96, everything i always had was 80's or older.
I just thought the cooler the better, but i guess the car needs to be that hot to run rite.
Thanks again man you talked me out of my car running to hot fear! 
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Hammer Time
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Apr 2, 2011, 6:18 PM
Post #21 of 32
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Re: 96 geo metro. cooling fan don't work.
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Your not the first one to think that. It needs that temp for a number of reasons.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 7:46 PM
Post #22 of 32
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Re: 96 geo metro. cooling fan don't work.
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Please tell me all the reasons!
I know that it will use more fuel cause the ECU thinks the engine is cold but, what are the others?
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Hammer Time
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Apr 2, 2011, 7:48 PM
Post #23 of 32
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Re: 96 geo metro. cooling fan don't work.
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The ECM is looking for that temp. It won't even go into closed loop if the temp is too low and that means it will ignore the sensor data because it thinks it's in "warm up" mode indefinitely. It also won't burn the fuel totally.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Timthecarguy719
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Apr 2, 2011, 7:49 PM
Post #24 of 32
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Re: 96 geo metro. cooling fan don't work.
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So.., will i get a little better MPG now?
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Hammer Time
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Apr 2, 2011, 7:52 PM
Post #25 of 32
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Re: 96 geo metro. cooling fan don't work.
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Possibly. It depends how it's driven. it's a gutless car to start with.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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