Fans...How much does it draw?
Fans...How much does it draw?
Happy Holidays Everyone:
I'm curious. How much voltage does the fans draw after you shut off the car? My car's fans run for like 10 minutes after I shut off the car regardless on how long it has been on. Can anyone shed some light on this for me?
Thanks
I'm curious. How much voltage does the fans draw after you shut off the car? My car's fans run for like 10 minutes after I shut off the car regardless on how long it has been on. Can anyone shed some light on this for me?
Thanks
I'm not mechanically inclined...so could you explain why AMP is important to know?
Originally Posted by Monkman33
Voltage is easy... lol.
It's amperage that you need to worry about.
It's amperage that you need to worry about.
Joined: May 2005
Posts: 3,243
Likes: 42
From: Kennewick, Washington
No worries bro,
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
Originally Posted by Monkman33
No worries bro,
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
Joined: May 2005
Posts: 3,243
Likes: 42
From: Kennewick, Washington
An easy way to check the Maximum draw is to see what fuse rating they are under. If you want to check teh exact amp draw, use an ammeter. I am not familiar enought with the FD electrical system to know this right off hand.
10 minutes and running fans sounds scary to me, but that's because I am used to my current crappy car that will kill a battery if i leave the dome light on... lol
10 minutes and running fans sounds scary to me, but that's because I am used to my current crappy car that will kill a battery if i leave the dome light on... lol
Originally Posted by Monkman33
No worries bro,
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
I'll give you a quick rundown, since you were willing to be tasteful and admit not knowing something. That was cool!
Cars are a 12v closed system. meaning that the componenst and accessories will run off of 12v (or 14.4v when the vehicle is running due to the alternator). Think of a battery as a water storage device (for metaphorical reasons). now think of electrical wires as pipes for the water to run in. voltage would be the water pressure and amperage would be the flow (gallons per hour) The pressure is constant, however if the accessory only needs a little power, then it will not draw very much amperage (water) . So basically, voltage is constant, amperage (current draw) is different for each accessory, depending on how much power they need to function. A battery will only store a certain amount of power, measured in amp-hours. so if an item draws a lot of amperage, then it will drain the battery faster.
If this is not worded right le me know. kinda in a rush to get to x-mas dinner. I am willing to help anyone out with learning Ohm's law and basic electronics as I feel it is good knowledge to have.
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Current draw at various speeds, according to the Factory Service Manual: This is from page 174 of the PDF file that can be downloaded here: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/94-fsms-available-download-449950/
10.6-16.6A at high speed,
06.5-12.5A at medium speed,
05.8-11.8A at low speed.
The fan 'speed' is determined by the cooling fan relays. More info about that here: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/2-trigger-cooling-fans-462760/
Monkman33's explanation of current and voltage was good, but www.howstuffworks.com should have nice diagrams and illustrations for those wanting to know more about how electricity works.
-s-
10.6-16.6A at high speed,
06.5-12.5A at medium speed,
05.8-11.8A at low speed.
The fan 'speed' is determined by the cooling fan relays. More info about that here: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/2-trigger-cooling-fans-462760/
Monkman33's explanation of current and voltage was good, but www.howstuffworks.com should have nice diagrams and illustrations for those wanting to know more about how electricity works.
-s-
Last edited by scotty305; Dec 26, 2005 at 12:12 PM.
Full Member
Joined: Aug 2001
Posts: 225
Likes: 0
From: Columbia,SC
Just curious why the fans run everytime when the car is off? Did you perform the cooling fan mods? This mod will allowed the used to do this and on top of that, a switched (on/off) was an option too so you could turn fans off if per say the engine was cool. I hope this is the case.... if this mod has not been performed then your engine is running HOT. Just a thought... I am sure it's okay since you mentioned the fans come on regardless of drive time.
I had this fan mod but did not like my fans running say in the winter with a mini battery for 10 minutes so I did away with this mod and installed an FC thermoswitch. Not my engine is running 20 degrees F cooler and the fan come on around 192 instead of a higher speed.
I had this fan mod but did not like my fans running say in the winter with a mini battery for 10 minutes so I did away with this mod and installed an FC thermoswitch. Not my engine is running 20 degrees F cooler and the fan come on around 192 instead of a higher speed.
Originally Posted by superfastrx7
Just curious why the fans run everytime when the car is off? Did you perform the cooling fan mods? This mod will allowed the used to do this and on top of that, a switched (on/off) was an option too so you could turn fans off if per say the engine was cool. I hope this is the case.... if this mod has not been performed then your engine is running HOT. Just a thought... I am sure it's okay since you mentioned the fans come on regardless of drive time.
I had this fan mod but did not like my fans running say in the winter with a mini battery for 10 minutes so I did away with this mod and installed an FC thermoswitch. Not my engine is running 20 degrees F cooler and the fan come on around 192 instead of a higher speed.
I had this fan mod but did not like my fans running say in the winter with a mini battery for 10 minutes so I did away with this mod and installed an FC thermoswitch. Not my engine is running 20 degrees F cooler and the fan come on around 192 instead of a higher speed.
Full Member
Joined: Aug 2001
Posts: 225
Likes: 0
From: Columbia,SC
Originally Posted by ranchan02
I'm not really sure why the fans runs for that long regardless on how long the cars on...I always thought it was normal for this car.
Now having said that, I believe when you bought the car someone had already done this to the car previously. I am guessing you have the stock ECU? If not, and you have a PFC then you can actually program in when to allow the fans to come on. That may just need to be re-program.
I will e-mail you the tread that explains how to make this fan mods to help you understand this mod.
What temps are you running your car at say on a summer day and after running it for a while?
Full Member
Joined: Aug 2001
Posts: 225
Likes: 0
From: Columbia,SC
Originally Posted by superfastrx7
I am guessing you have the stock ECU?
Originally Posted by superfastrx7
I will e-mail you the tread that explains how to make this fan mods to help you understand this mod.
Originally Posted by superfastrx7
What temps are you running your car at say on a summer day and after running it for a while?
Thanks for all the great info everyone!
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