Cooling fan/cooling issue
#1
Cooling fan/cooling issue
Okay I'm in the middle of troubleshooting my cooling system.
First with the cooling system itself, I just replaced thermostat because old one was being slow. We're in the process of burping it and car was getting too hot so we shut it off. Upper radiator hose is hot, lower one not so much. Car only ran for 4 mins or so. Thinking clogged radiator? Idk.
Big reason the car getting hot is my fans. They won't activate. I checked fuse and relays and all are good. Fans turn on when A/C is switched on but looks like not reacting to thermoswitch or ecu temp sensor.
I just had my harness redone so maybe they messed up on wiring, but I can't imagine them messing up on both sensors.
Im running a 16 psi pressure cap, a upgraded radiator(not sure what brand came with car), stock everything, other than catback.
First with the cooling system itself, I just replaced thermostat because old one was being slow. We're in the process of burping it and car was getting too hot so we shut it off. Upper radiator hose is hot, lower one not so much. Car only ran for 4 mins or so. Thinking clogged radiator? Idk.
Big reason the car getting hot is my fans. They won't activate. I checked fuse and relays and all are good. Fans turn on when A/C is switched on but looks like not reacting to thermoswitch or ecu temp sensor.
I just had my harness redone so maybe they messed up on wiring, but I can't imagine them messing up on both sensors.
Im running a 16 psi pressure cap, a upgraded radiator(not sure what brand came with car), stock everything, other than catback.
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#8
Rotary Freak
iTrader: (24)
Sounds like your fan is not turning on.
I would personally try and activate the fan manually by supplying power and ground to it to MAKE sure the fan is not toasted itself. Then if it does, the problem is within either the harness itself, faulty sensor or faulty ECU.
Did you turn your HEAT on HIGH and fan on LOW while trying to burp the system? It will get the coolant to start circulating by turning the HEAT on HIGH.
I hope this helps.
-AzEKnightz
I would personally try and activate the fan manually by supplying power and ground to it to MAKE sure the fan is not toasted itself. Then if it does, the problem is within either the harness itself, faulty sensor or faulty ECU.
Did you turn your HEAT on HIGH and fan on LOW while trying to burp the system? It will get the coolant to start circulating by turning the HEAT on HIGH.
I hope this helps.
-AzEKnightz
#9
Haha Eric I was about to call you for your opinion too lol. We supplied power to fans and ones working great, other is kind of getting tired but still runs. The fans come on when a/c switch is on so their not toast. A cel recently went up so I have to check that, I'm pretty sure it's cuz of a missing egr solenoid, but can possibly be ecu coolant sensor.
#10
Rotary Freak
iTrader: (24)
Haha Eric I was about to call you for your opinion too lol. We supplied power to fans and ones working great, other is kind of getting tired but still runs. The fans come on when a/c switch is on so their not toast. A cel recently went up so I have to check that, I'm pretty sure it's cuz of a missing egr solenoid, but can possibly be ecu coolant sensor.
I personally DONT see the ECU being the culprit, its either the harness OR the fan switch itself.
I'll check continuity from the fan switch side to the ECU pin side to make sure you are getting a good continuity. If so, then your problem is your fan switch. Make sense?
-Eric
#14
Urban Combat Vet
iTrader: (16)
Personally I fill, replace cap, squeeze hose, remove cap and repeat.
As far as checking fans...... Cooling Fan Test Proecdure and FAQ
As far as checking fans...... Cooling Fan Test Proecdure and FAQ
#16
Full Member
iTrader: (5)
after a flush, i drive it easy until it cycles a couple times. usually takes care of the air in the system.
if you aren't able to do that, its most likely the fans or radiator.
do you get different results at speed? versus traffic? or same issue all the time?
fyi, heater switch moves a blend door, not a valve. having the heat on will just make you very uncomfortable.
if you aren't able to do that, its most likely the fans or radiator.
do you get different results at speed? versus traffic? or same issue all the time?
fyi, heater switch moves a blend door, not a valve. having the heat on will just make you very uncomfortable.
#17
haven't done any driving yet, never mentioned anything about the heater.
I only had time for one test, I grounded the TFA connector and the fans came on at low speed, and according to that guide its not ECU or the switch. still have to test medium and high.
I only had time for one test, I grounded the TFA connector and the fans came on at low speed, and according to that guide its not ECU or the switch. still have to test medium and high.
#18
Rotary Freak
iTrader: (24)
after a flush, i drive it easy until it cycles a couple times. usually takes care of the air in the system.
if you aren't able to do that, its most likely the fans or radiator.
do you get different results at speed? versus traffic? or same issue all the time?
fyi, heater switch moves a blend door, not a valve. having the heat on will just make you very uncomfortable.
if you aren't able to do that, its most likely the fans or radiator.
do you get different results at speed? versus traffic? or same issue all the time?
fyi, heater switch moves a blend door, not a valve. having the heat on will just make you very uncomfortable.
Thank you for the pointing this out, I totally forgotten that I am dealing with a FD here. Was thinking of a modern vehicle that uses water valves that flows coolant...
I also do not know about this Fan Testing method. Great info here.
-AzEKnightz
Last edited by AzEKnightz; 08-18-12 at 11:52 PM.
#19
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The thermoswitch and ECU temp sensor are in fairly high points in the system. Could it be that the coolant level in the system wasn't sufficient for them to get a good temperature reading and request the fans?
#23
93 Touring
Are you SURE that both fans are working correctly?
We had one bad fan motor and it caused us all sorts of problems including not just overheating and it's coolant issues BUT an a/c that did not cool properly. We replaced the bad fan an What a difference, car ran cooler plus a/c worked better.
We had one bad fan motor and it caused us all sorts of problems including not just overheating and it's coolant issues BUT an a/c that did not cool properly. We replaced the bad fan an What a difference, car ran cooler plus a/c worked better.
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