High temp when Aircon/Fan is off on Civic'10

[Liana]

Good day po, Help po on what parts to be replaced or fixed. Pag naka-Off po aircon nataas po temp, pero pag naka-On nabalik sa normal gauge.. Civic'10 po.

[travajante]

Good day po, Help po on what parts to be replaced or fixed. Pag naka-Off po aircon nataas po temp, pero pag naka-On nabalik sa normal gauge.. Civic'10 po.

If yours is a dual-fanned system, check your coolant temp triggered 1. It may be gone. The AC cooling fan activates w/ the AC, hence your engine temp drops w/ AC on.
If it's a single multi-speed fan, some older ones are speed-control-resistor equipped...that part may be toast. AC triggers high speed which bypasses that resistor.
Other items to check...Coolant temp sensor & thermostat. Has the car ever overheated? If so, check your oil condition via the dipstick & the oil cap....mayo looking oil will require head gasket job. Let's pray against that.

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[Liana]

If yours is a dual-fanned system, check your coolant temp triggered 1. It may be gone. The AC cooling fan activates w/ the AC, hence your engine temp drops w/ AC on.
If it's a single multi-speed fan, some older ones are speed-control-resistor equipped...that part may be toast. AC triggers high speed which bypasses that resistor.
Other items to check...Coolant temp sensor & thermostat. Has the car ever overheated? If so, check your oil condition via the dipstick & the oil cap....mayo looking oil will require head gasket job. Let's pray against that.

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Sorry sir, di ko magets. Okay naman po ung coolant ko clear green pati ung sa takip ok naman. Yung oil clear din po. Pag naka off lang talaga ung AC dun lang nataas, balak ko sana palit radiator.. Dinala ko kasi sa casa, after dalhin saka naglabasan mga sira.. haays...

[travajante]

Sorry sir, di ko magets. Okay naman po ung coolant ko clear green pati ung sa takip ok naman. Yung oil clear din po. Pag naka off lang talaga ung AC dun lang nataas, balak ko sana palit radiator.. Dinala ko kasi sa casa, after dalhin saka naglabasan mga sira.. haays...

Check the fan/s 1st before digging further. 1 might be dead. Don't jump into replacing the radiator just yet.
Guesswork is good for mysteries....yours should be a simple huntdown.

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[Liana]

Check the fan/s 1st before digging further. 1 might be dead. Don't jump into replacing the radiator just yet.
Guesswork is good for mysteries....yours should be a simple huntdown.

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Thank you sir! Will do a check mamaya po.

[dr. d]

Good day po, Help po on what parts to be replaced or fixed. Pag naka-Off po aircon nataas po temp, pero pag naka-On nabalik sa normal gauge.. Civic'10 po.

i heard of this before.
the cooling aux fan would work, only because the aircon was turned on.
the "other switch" or other fan, if dual, was malfunctioning.
the radiator was fine, as i recall.

[travajante]

i heard of this before.
the cooling aux fan would work, only because the aircon was turned on.
the "other switch" or other fan, if dual, was malfunctioning.
the radiator was fine, as i recall.

There are 2 fan triggers. AC & Coolant temp sensor. The latter is 1 of the usual suspects.

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[oj88]

The Civic FD has two fans AND two fan speeds; Low and High. They both operate simultaneously.... so both are either OFF, Low Speed, or High Speed.... no in-between.

The Low speed is triggered whenever the engine coolant reaches operating temp.

The High speed is triggered whenever the A/C is switched on, regardless of coolant temp.

The High speed will also be triggered if the coolant temp is close to overheating, regardless of whether the A/C is on or off. In fact, to preserve itself, the ECU will disable the A/C when the engine becomes in danger of overheating.

That said, the first thing to check is if both fans are spinning normally as I've explained above. If one is spinning slower than the other or is not spinning at all, it will likely need replacement. These DC motors uses carbon brushes that wear out over time. If both fans are NOT spinning even if the coolant temp is well beyond normal operating temp, you will need to check the Low speed fuse.

This is just to give you an idea of how you can approach the problem and do the diagnosing by yourself. Of course, it is still recommended to have it looked at by a reputable technician.

[StockEngine]

Please dont crack your engine. Set that ac to max...

[travajante]

The Civic FD has two fans AND two fan speeds; Low and High. They both operate simultaneously.... so both are either OFF, Low Speed, or High Speed.... no in-between.

The Low speed is triggered whenever the engine coolant reaches operating temp.

The High speed is triggered whenever the A/C is switched on, regardless of coolant temp.

The High speed will also be triggered if the coolant temp is close to overheating, regardless of whether the A/C is on or off. In fact, to preserve itself, the ECU will disable the A/C when the engine becomes in danger of overheating.

That said, the first thing to check is if both fans are spinning normally as I've explained above. If one is spinning slower than the other or is not spinning at all, it will likely need replacement. These DC motors uses carbon brushes that wear out over time. If both fans are NOT spinning even if the coolant temp is well beyond normal operating temp, you will need to check the Low speed fuse.

This is just to give you an idea of how you can approach the problem and do the diagnosing by yourself. Of course, it is still recommended to have it looked at by a reputable technician.

Good FDspecific guidance![emoji106]

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