radiator fan runs constantly engine off?
05-25-2023 | 04:12 PM
#1
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radiator fan runs constantly engine off?
2015 SRX the coolant fan runs constantly even after the engine if off. Runs the battery down.
I have replaced 2 relays in the fuse box in the engine compartment and the coolant fan resistor. Still runs. If disconnect the coolant fan resistor it stops. Can I use the car without the coolant fan resistor ?
Need help what else can I can check. the temperature does not get hot and the AC works fine.
Thank you for the assistance.
I have replaced 2 relays in the fuse box in the engine compartment and the coolant fan resistor. Still runs. If disconnect the coolant fan resistor it stops. Can I use the car without the coolant fan resistor ?
Need help what else can I can check. the temperature does not get hot and the AC works fine.
Thank you for the assistance.
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CathedralCub (05-26-2023)
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CathedralCub (05-26-2023)
05-25-2023 | 09:03 PM
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Thank you for your reply.
I am not sure what you mean, is it getting any power. The car stars and runs fine once I disconnected the fan and charged the battery.
By running fine, I am not driving it just trying to diagnose and repair it.
Like I stated , I have replaced the 2 relays in the engine compartment fuse box, Fan rely #1 and #2 and the coolant fan resistor that is in mounted on the radiator.
i am at a stand still at this point.
While the engine is running all the gauges seem to work fine, I have a cheap OBD II unit and it has no codes and the live readings show the temp rises to a normal reading but does not over heat. Fuel usage and other info seems to be fine as well. The AC is cooling as normal. I have not checked or unplugged the MASS sensor or anything yet.
I am not sure what you mean, is it getting any power. The car stars and runs fine once I disconnected the fan and charged the battery.
By running fine, I am not driving it just trying to diagnose and repair it.
Like I stated , I have replaced the 2 relays in the engine compartment fuse box, Fan rely #1 and #2 and the coolant fan resistor that is in mounted on the radiator.
i am at a stand still at this point.
While the engine is running all the gauges seem to work fine, I have a cheap OBD II unit and it has no codes and the live readings show the temp rises to a normal reading but does not over heat. Fuel usage and other info seems to be fine as well. The AC is cooling as normal. I have not checked or unplugged the MASS sensor or anything yet.
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CathedralCub (05-26-2023)
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CathedralCub (05-26-2023)
05-26-2023 | 12:35 AM
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There is always high-amperage power at the relays. When a relay is closed, it passes through to the fans and they turn on. Next step, is there power coming to the control side of the relays? Sounds like there is, but I'm curious about something:
When you pull one of your new relays, does one fan stop? When you unplug the other relay, does the other fan stop?
Next we need to figure out what is supplying control voltage to the control side of the relays.
While I'm here:
Is the coolant full?
Are there any trouble lights on the dash?
Confirming: there are zero codes stored in the OBD2, right?
Has the car suffered any recent trauma such as accidents and/or major repairs?
How many miles on the car?
How many miles have you owned the car?
What does the dash board say the ambient temperature is?
When you pull one of your new relays, does one fan stop? When you unplug the other relay, does the other fan stop?
Next we need to figure out what is supplying control voltage to the control side of the relays.
While I'm here:
Is the coolant full?
Are there any trouble lights on the dash?
Confirming: there are zero codes stored in the OBD2, right?
Has the car suffered any recent trauma such as accidents and/or major repairs?
How many miles on the car?
How many miles have you owned the car?
What does the dash board say the ambient temperature is?
05-26-2023 | 10:25 AM
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There is always high-amperage power at the relays. When a relay is closed, it passes through to the fans and they turn on. Next step, is there power coming to the control side of the relays? Sounds like there is, but I'm curious about something:
When you pull one of your new relays, does one fan stop? When you unplug the other relay, does the other fan stop?
Next we need to figure out what is supplying control voltage to the control side of the relays.
While I'm here:
Is the coolant full? Yes
Are there any trouble lights on the dash? No trouble lights
Confirming: there are zero codes stored in the OBD2, right? Zero codes
Has the car suffered any recent trauma such as accidents and/or major repairs?
No trama. No repairs
How many miles on the car? 25000k
How many miles have you owned the car? 25000 miles
What does the dash board say the ambient temperature is?
When you pull one of your new relays, does one fan stop? When you unplug the other relay, does the other fan stop?
Next we need to figure out what is supplying control voltage to the control side of the relays.
While I'm here:
Is the coolant full? Yes
Are there any trouble lights on the dash? No trouble lights
Confirming: there are zero codes stored in the OBD2, right? Zero codes
Has the car suffered any recent trauma such as accidents and/or major repairs?
No trama. No repairs
How many miles on the car? 25000k
How many miles have you owned the car? 25000 miles
What does the dash board say the ambient temperature is?
This car only has one fan. It stops when I unplug the fan resistor unit.
Or relay.
I not sure how to test where the power is coming from.
I have turned off the AC but no difference.
if I connect HVAC hoses while run what should the pressures be?
I hate to just add refrigerate and over charge the system
Thank you for your help on this
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CathedralCub (05-26-2023)
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CathedralCub (05-26-2023)
05-27-2023 | 09:47 PM
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Thank you, I had just read that low freon and high pressure would make the fan still on.. (didn't make sense me but wanted to check)
I will look for a schematic. Not sure where but will check online.
Thank you agin for you patience and help.
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CathedralCub (05-28-2023)
05-28-2023 | 12:32 AM
#10
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