Civic Thermo Switch Issue?

**yojstamaria** · June 4th, 2013 11:00 PM

Hi Sirs,
Napapansin ko lang sa Civic 2003 Lxi ko, yung Radiator fan Hindi umaandar pag hindi bukas yung Aircon. Tinest ko sya, start, 10 minutes Idle, 5 minute run, then open ko yung hood hindi talaga umaandar yung rad fan pag naka off ang Aircon. Mga 5 mins ko inantay hindi nag-oon. Pag binuksan ko yung aircon, ayun, umaandar yung dalawang rad fan, tapos sumasabay sya sa automatic On-off ng aircon.

Nakarekta kaya ito sa linya ng Aircon or ganito lang talaga to? Alam ko kasi sa Thermo switch bubukas ang Rad fan pag mainit.

Kung may problema sa ganito, san kaya makapagtitiwalaang mapatingin to sa Bulacan or Quezon City area?

Hindi naman ako nag-ooverheat pero napapraning lang parang hindi tama na sumasabay sa aircon yung Radiator fans. Hehe BTW, 2nd hand ko kasi nabili to kaya wala ako history ng mga problema nito.

Thanks!

**ans_lim168** · June 5th, 2013 08:15 AM

Originally Posted by yojstamaria

Hi Sirs,
Napapansin ko lang sa Civic 2003 Lxi ko, yung Radiator fan Hindi umaandar pag hindi bukas yung Aircon. Tinest ko sya, start, 10 minutes Idle, 5 minute run, then open ko yung hood hindi talaga umaandar yung rad fan pag naka off ang Aircon. Mga 5 mins ko inantay hindi nag-oon. Pag binuksan ko yung aircon, ayun, umaandar yung dalawang rad fan, tapos sumasabay sya sa automatic On-off ng aircon.

Nakarekta kaya ito sa linya ng Aircon or ganito lang talaga to? Alam ko kasi sa Thermo switch bubukas ang Rad fan pag mainit.

Kung may problema sa ganito, san kaya makapagtitiwalaang mapatingin to sa Bulacan or Quezon City area?

Hindi naman ako nag-ooverheat pero napapraning lang parang hindi tama na sumasabay sa aircon yung Radiator fans. Hehe BTW, 2nd hand ko kasi nabili to kaya wala ako history ng mga problema nito.

Thanks!

If you turn the key to "on" position, does the radiator fan engage? If yes then the thermo switch has been bypassed, if not then try to turn on the aircon and rev your engine for 3 minutes till the auxiliary fans disengage, repeat the steps until such a time the radiator fan will engage first before the condenser fan. You may try this first before bringing your car to a trusted mechanic, hopefully this is the scenario since your car is not overheating.

**yojstamaria** · June 5th, 2013 11:34 AM

Originally Posted by ans_lim168

If you turn the key to "on" position, does the radiator fan engage? If yes then the thermo switch has been bypassed, if not then try to turn on the aircon and rev your engine for 3 minutes till the auxiliary fans disengage, repeat the steps until such a time the radiator fan will engage first before the condenser fan. You may try this first before bringing your car to a trusted mechanic, hopefully this is the scenario since your car is not overheating.

no, rad fan does not engage if I turn the key to On position. I'll try your steps as soon as I get home. What I observed is when the aircon is on, the fans turn on also, but yes, there are times rad fan engages first before condenser fan, I'm just not sure why they just engage whenever I turn on the aircon, natatakot lang baka if I decide to drive without aircon, I will overheat, I'll try your steps later and observe longer. thanks!

**ans_lim168** · June 5th, 2013 04:42 PM

Originally Posted by yojstamaria

no, rad fan does not engage if I turn the key to On position. I'll try your steps as soon as I get home. What I observed is when the aircon is on, the fans turn on also, but yes, there are times rad fan engages first before condenser fan, I'm just not sure why they just engage whenever I turn on the aircon, natatakot lang baka if I decide to drive without aircon, I will overheat, I'll try your steps later and observe longer. thanks!

Then it's okay, no cause for alarm since there are times the rad fan turns first before the condenser fan, that means the water temp has reached the maximum allowed that's why the fan turns. Try to drive without aircon and sense if the rad fan also turns, my hunch is your cooling system is just fine.

**ans_lim168** · June 5th, 2013 04:42 PM

Originally Posted by yojstamaria

no, rad fan does not engage if I turn the key to On position. I'll try your steps as soon as I get home. What I observed is when the aircon is on, the fans turn on also, but yes, there are times rad fan engages first before condenser fan, I'm just not sure why they just engage whenever I turn on the aircon, natatakot lang baka if I decide to drive without aircon, I will overheat, I'll try your steps later and observe longer. thanks!

Then it's okay, no cause for alarm since there are times the rad fan turns first before the condenser fan, that means the water temp has reached the maximum allowed that's why the fan turns. Try to drive without aircon and sense if the rad fan also turns, my hunch is your cooling system is just fine.

**ans_lim168** · June 5th, 2013 04:43 PM

Originally Posted by yojstamaria

no, rad fan does not engage if I turn the key to On position. I'll try your steps as soon as I get home. What I observed is when the aircon is on, the fans turn on also, but yes, there are times rad fan engages first before condenser fan, I'm just not sure why they just engage whenever I turn on the aircon, natatakot lang baka if I decide to drive without aircon, I will overheat, I'll try your steps later and observe longer. thanks!

double post.

**yojstamaria** · June 7th, 2013 12:40 AM

Just updating this thread, I got to test them, and oo nga, nag-on sya after 15 minutes. Tagal ko rin inintay and I was about to close the hood then the rad fan came alive without the Aircon on, then shut off again after a while. Lol! hehe Paranoid lang talaga siguro ako, I think the engine is not hot enough for it to activate hehe.

I got a manual downloaded from PDF and I saw other problems from my car but I'll post it in a proper thread.

Thanks Sir hehe.