Coolant Fans won't switch off
#1
Coolant Fans won't switch off
Hi
I installed 2 eBay 80W slim fans a couple of years back and ran the car for a while then put it off the road for 2 years. I got it back out in March this year and since the. When the car geta warm the fans come on and stay on and don't go back off.
I had a coolant leak on the coolant reroute so as good practise I took it off changed the gaskets and put a brand new genuine Mazda thermostat in. Put it all back together and it's made no difference.
Ive also changed the green thermo sensor at the back for another one I had and changed the black fan switch at the front of the car.
The only other things I can think now are the relay controlling the fans or an ecu setup issue.
I'm running a DIY PNP supplied by Brain and haven't had any issues with it.
Please help it's frustrating me to death
Regards
Ronnie
I installed 2 eBay 80W slim fans a couple of years back and ran the car for a while then put it off the road for 2 years. I got it back out in March this year and since the. When the car geta warm the fans come on and stay on and don't go back off.
I had a coolant leak on the coolant reroute so as good practise I took it off changed the gaskets and put a brand new genuine Mazda thermostat in. Put it all back together and it's made no difference.
Ive also changed the green thermo sensor at the back for another one I had and changed the black fan switch at the front of the car.
The only other things I can think now are the relay controlling the fans or an ecu setup issue.
I'm running a DIY PNP supplied by Brain and haven't had any issues with it.
Please help it's frustrating me to death
Regards
Ronnie
#4
Tweaking Enginerd
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Pretty sure there is also a fan relay somewhere. These can operate in one direction and stick. If your fans are wited in parallel, this is another place to look. If they are switched from dedicated relays, then check your switch point in TS.
#8
I tried to change the relay for another 30A relay and initially the fans went off which was great. but I revd the car again to get them to come back on and they never switched off again.
What ampage relay should be used?
Tried to check auto tune and I can't see any settings to switch the fans off.
What ampage relay should be used?
Tried to check auto tune and I can't see any settings to switch the fans off.
#9
Tweaking Enginerd
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P = VI
V = 12V
P = 80W x 2 = 160W
160W/12V = 13.33A
Is the coolant temp dropping below the setpoint in TS? If it is not, the fans will stay on.
If the coolant temperature reading in TS is mucked (scale is off) that could hose you as well. Check out the online MS guides, make sure your sensors are working as expected in TS ...
V = 12V
P = 80W x 2 = 160W
160W/12V = 13.33A
Is the coolant temp dropping below the setpoint in TS? If it is not, the fans will stay on.
If the coolant temperature reading in TS is mucked (scale is off) that could hose you as well. Check out the online MS guides, make sure your sensors are working as expected in TS ...
#10
based on how he refers to it (autotune) I'm guessing he has not a single clue how to even use megasquirt and would rather replace half the hardware on the car than open up tunerstudio, connect to the ecu, and go into fan settings to see what it's set at, which would take 5 seconds.
It should be under basic settings if you're on MS3
It should be under basic settings if you're on MS3
#15
mkturbo.com
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I don't know if MS2 have a fan outputs section, or you have to use a generic output. I know somewhere it is there though. What I assume is happening is you have a 90C thermostat and temps are hovering right above that, and so once the fans trip they never go off because it does not cool much below 90C.