Hello ,I have a 2003 honda accord ua cl7. My issue is overheating and i noticed fans dont come on when engine gets hot. This problem started when battery died and i used a different battery to start car then put my onld one back in. When the key is on the on position or when you start the car both fans come on for about 5 seconds then off. When the car overheats the fans dont come on. I cheam think if fans come on on cold start or on then that rules out fuse, relay n wiring issues? Also the fan switch connector is getting 12v with tester so i kno power is coming to it and i chnged the fan switch in the lower bottom of the radiator still nothing works. My ac compressor doesnt work i kno that and heat doesnt work i know that as well.

 

Do both come on on just 1

 

yes both fans come on...my ac compressor hasnt been good for months av been going without it as weel *** without heat am in the tropics. But this overheating all started that night when battery died and again yes both fans come on initially when car is on "on" or when car starts then after abt 5 seconds they stop

 

Hope this helps

 

I'd unplug the electrical connector to the fan switch on the radiator. Use a volt meter and test for 12V on the green wire. Use the - battery post for your ground. Also inspect the wiring for any signs of damage or corrosion as that connector can get exposed to the elements.

 

Yes I did all that only thing i have not tried to do is to bridge the fan switch connector to see if fans would come on because i know buying a new fan switch it might not be good too

 

I have volt tester and yes am getting 12 volts from fam switch connector plug as well as from the connector plug to the fan itself. But remember both fans com on when car is on "on" or if engine starts but they stop spinning after 5 secs. So i kno the fuse and relay do work n that the fans are getting the power they need. Its just that when it gets hot and the needle passes the halfway mark the fans dont come on to cool the coolant in the radiator. Which my guess isnthe fan switch doesnt work even tho its new. 2marow i will bridge the fan switch connecting plug while the engine is hot to see if its that the new fan switch isnt good.

 

Bridged fan switch connector and both fans run. Still no heat i hear a sound in the dash when i turn heater on. If i go uphill car starts to overheat needle moving towards H quickly. I have to pull over and turn of engine then turn car to ON and allowed bridged fans to cool down the engine b4 I can move again. But if fans are on constantly y does it still overheat. Gonna visit mechanic and technician.

Again i have a 2003 ua cl7 but with 2.4l k24 engine. Overheating started one night when car battery died i was playing music all day. Removed my battery allowing another battery to be used then placed back my battery after car started. Thats when i first heard the gurgling or boiling . at this point am wondering if its the radiator that needs to be cleaned or thermostat not good or water pump bad. Water pump looks great tho no leaks or shakiness....lower hose gets warm and even hot but upper hose gets hot first. Am thinking coolant isnt circulating. Last time i tried with radiator cap off n it sucked in water i had to refill. Not sire whats happening now again if i go over a hill car overheats fans bridged running constantly still no heat tho