I have a '02 TL-S. I have searched several times and not finding any thread with a similar situation.
I just had the timing belt, water pump, thermostat & coolant flush in the past 3,000 miles.

Here is the situation that I have noticed even before the work was done. When I turn on the a/c, both fans run. But the fans go from running normal to high speed every 5 seconds then back to normal and then back to high speed a few seconds later. Then occasionally they running normal for 30 seconds or so and then back to high/low. Both fans are running. I am not sure if both fans are doing this. I notice this when I am stopped or parked. I am not noticing this when the a/c is off.

Is this normal or a issue with a sensor or relay?

 

The driver-side fan is for the radiator, while the passenger-side fan is actually for the a/c condenser, which is basically a radiator as well. It is the a/c condenser fan that is going on-and-off. When the car is moving, normal air flow is enough to cool the condenser, but when stopped, the fan kicks on to cool it. The fan will cycle on-and-off as the compressor cycles. Totally normal.

 

ummmm.... but with that cycling speed though, it does not sound normal though (kinda fast)

anyways you might have a bad radiator fan control module, funny things happen when that goes out (especially common for it to go out on older honda's, where the dealer will actually keep one in stock), but i have not heard much of them going bad on our cars though

but it might also just be that you are on the tempeture threshold though, of the cycling between the high and low speeds though idk

 

After a drive or start you car and let it warm up, leave the A/C off.
When the cooling fan kicks in (low speed), press the A/C button and turn it on.
If the fan speeds up (high speed) then everything should be okay.
If it goes back to low speed, turn off the A/C and see if the fan shuts off, if it does it's normal.

Also, when A/C is on check to make sure the clutch is engaged. You could be low on refrigerant thus making the clutch disengage and then fan going back to low speed.

Any other questions let me know.

 

Yes, low refrigerant will cause it to cycle on-and-off more often.

 

So the suggestion I am getting here is to have the refrigerant check and add any if needed to the suggested level?

 

I 3rd the motion- get the ac freon topped off- diy if you have skills and knowledge of the system
When its low the compressor cycles constantly- thats often how tech knows its low

everyone be sure to use ac at least once a month for 15 minutes- keeps the seals lubed so you dont lose freon~

 

Shouldn't be a problem for the next several months
Now if you could remind us in December...

 

Turning the defrost on cycles the AC

 

x2, with defrost


but here there are times that the ac will kick on in the middle of december though, especially when you just have it on full auto (especially when the car has baked in the sun a little bit

 

but most people will overcharge it though, so probably better to just let a good shop do it

 

Got the car back from the shop. They stated they added some refrigerant to the system. I will check to see if this improves with the fan later on.

 

you have to understand the relationship between pressure reading and ambient temp
then consider what temp the air is supposed to be coming out the vents-ck with a guage
When its full it will crank out 40 degree air easily- havent ckd mine, but summer is near and 100-110f is common--ugh'

When you only need a few oz and the can holds 12...yes easy to overfill if no guages especially- those cans with a hose are dangerous IMO
if you own a set of ac guages you would probably be ok with diy top off.
If not, ck out your local ziner meets, ac and obdi code readers often accompany members- bring a can of freon

bring your own seafoam to events I attend lol

 

Well I had the shop near my office checkout the A/C today since I don't own a set of A/C guages. It seems to have improved tonight with the fan and now the A/C is a lot colder then before. I will continue to monitor it. Thanks for your suggestion.

 

Oh, I know. The cooling process takes humidity as well as heat out of the air, so the drier air helps remove moisture from the windshield.

 

first time i noticed that was when i was like 16 (2002 btw), in my 94 accord, when the green light on the button for the a/c, would come on (dimly though) when i would push the defrost button lol

and learned wounders what outside air does for defrosting a windshield then it does on recirc (mine was like the only one fogging up )

 

Overcharge it and your A/C will go hot cause the pump won't run. Learn't that the hard way

 

Yep, there is a pressure switch in the receiver/drier, and if the pressure is too low OR too high, it won't let the compressor run, thus no cooling

 

hence the reason for guages-
at least a low side, but both high and low guages preferred so you really know whats going on inside