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Alright, I'm still having a problem with my cooling fan working intermittently. I've already replaced thermoswitch and temp sensor with geniune honda parts. Does anyone have any other possibilities to suggest? This issue is getting under my skin pretty bad and I would like to get it resolved.

 
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This is a good one for you service techs out there...The only other thing that I think it could be is a relay of some sort, but dont know which one. The guy at the parts desk at the dealer didnt know which relay controlled what under the hood. Or he just didnt want to tell me. Anyway, besides all that, I'm out of ideas...

 
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is it working intermintly or working properly? The fans cut on and off while the car is on. explain this a bit more.

 
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The fan, although works most of the time properly, sometimes does not turn on when it is supposed to causing the car to overheat.

 
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so your car does overheat. I would check the relay because the basic purpose of a relay is to turn high current devices on and off. It probably has an internal short and needs to be replaced, but you need to check it first.

 
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Is there only one relay for the cooling system? If so, what do you mean "check it"?

 
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Radiator fan relay is top left in the under hood fuse box. They can and do go bad.

 
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Thanks a lot^^

 
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wat i would do if u cant fix the problem jus wire the fan straight to an ignition power that way ur car always runs cold and its also better for racing if its hooked up that way,doing so ur fan will always be on,so u dont have 2 worry bout over heatong

 
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You dont want the fan to run all the time. The ECU needs certain temps to register based off the cooling temp sensor readings. For instance, if the CTS stays cold, it'll never drop the idle down.

 
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The saga continues...

Ok, I havent had time to mess with anything until today, but I did find out a few new things that have me even more fustrated. Assuming that the problem is more than likely related to the relays, I opened up the fuse box. There are a total of 3 relays for both the condenser fan and the radiator fan. There are also 2 relays for each headlight and there is one for the horn. They are all identical. When experiencing the problem, I tried swapping out each relay that is related to the fans with the horn relay. This did not fix the problem. Also I do notice that when I am experiencing the problem, that if I turn on the a/c, both fans turn on immediately so therefore this proves that the fan is not the issue which means, I either have more than one relay bad, or I have a short in the wiring somewhere. Does anyone have anymore ideas? I hope I didnt confuse any of you reading this. I'm almost about ready to take it into the dealer to get this fixed but I sooooo do not wanna do that because for one reason, its a huge hassle and secondly my extended warranty may not cover it and at the very least I'll be stuck paying a $90 diagnostic fee according to what the dealer says.

 
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Oh and another thing you guys should know. I just thought of something... When I told you that when I turn on the a/c and both fans turn on immediately...I also noticed another strange thing that I forgot to mention as well. Right when I do this, I look back at the temp gauge in my factory gauge cluster and I see the temperature reading start to rise even higher! As funny as it may sound, do you think there is a possibility that there isnt anything wrong with my cooling fan/system at all and that there could be a temp. sending unit or gauge messed up or something causing a wrong reading on the gauge??

 
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I can't tell you where to begin to diagnose your problem. But here's what I would do in your situation. Replace the cheapest part that MIGHT
be the culprit. Keep adding to the list and cross out from the list if problem has not been solved.

• Radiator cap - believe it or not it could be as simple as a priceless cap. Maybe this is affecting your temp gauge.
• Thermostat
• O2 sensor
• Make sure you have enough coolant
• Make sure your wires are connected properly.

 
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^^Thermostat has been changed and I could have sworn I made sure the coolant was topped off when I replaced both the temperature sensor and the thermoswitch...also keep in mind that the entire symptom...the fans are sometimes not turning on when the gauge on the dash is indicating a rising temperature above normal. I'll check the coolant level again after my car cools down.

 
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OK this is weird...I opened the radiator cap and and it needed a little water...maybe theres an air pocket reaching the thermostat housing causing the fans to not turn on. Where is the air pocket coming from though? I must me losing coolant somehow. I dont know how though because I've been checking for leaks and dont see any and my tail pipe isnt blowing any white smoke.

 
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I think I'm going to try replacing my cap tomorrow. I noticed after topping off the radiator with water and running it for a while, there was still no pressure in the hoses. I think maybe a leak from the cap is causing the air pocket thats reaching the thermostat housing . Now that I think about it, the problem doesnt occurr at all right after topping the system off with coolant. Only two weeks or longer later.

 
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do you have no pressure at the cap or no pressure in the system? No pressure at the cap means your cap is bad. No pressure in the system or slowly losing pressure means you have a leak.

 
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^^When I had it running earlier, I pulled the cap off and I didnt hear any hiss like what you might normally hear from the vaccum. Also I'm not seeing any leakage under the car and I'm not noticing any steam rising out of the engine compartment like you might see if the coolant is burning off the side of the block.

 
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well pressure test your cap to see if it holds pressure. if it does, it is good, if it slowly loses pressure or has none or little pressure, replace it.

 
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I dont have a tool to do that.

 
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go by any auto shop and hand them the cap and see if they will test it, takes 5 sec. Have you also checked your coolant condition? this and the cap are the first things you check when overheating. Well the level of the coolant and then to see if you have a 50/50 mixture or close to it. Having one way off will overheat the car.

 
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I replaced the cap today and ran it for a while just checking on things. The no signs of trouble yet. I tried squeezing the radiator hoses again while the engine was running and there is pressure inside now which is a good sign compared to yesterday. I think it may be fixed now, but time will tell.

 
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If your not to sure about your coolant level, I would do a coolant flush. Before I did one, my temp. needle was like right in the middle. After my flush, its in between the middle and the bottom. Runs a lot better.

 
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I havent had any problems since I replaced the cap. I also flushed it, but I dont think it was the condition of my coolant that was causing a problem. I'm still monitoring things though to see if the problem has actually been fixed or not.

 
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OK guys, unfortunately I think I got my verdict yesterday. I went out and checked under my hood. and noticed the resevoir had over flowed again so I think I blew my headgasket. I already have a HG that my dad bought me a while back when I was planning to have headwork done but its made by ishnu, not nippon. Should I use it anyway?