Hello,

I am very sorry if my question has been answered before, I've searched using the terms "engine" and "fan" but get litterally thousands of results and none seem to match.

Here is my question, I just noted that everytime I put the AC compressor on in the car, a couple of seconds afterwards the engine cooling fan comes on, and this happens even with a stone-cold engine. The Engine cooling fan seems to remain on until I shut off the AC. Is this normal ? I thought that the engine cooling fan was triggered by engine coolant reaching a certain temperature...

Now of course, I do not know if the fan runs also when the car is rolling, for obvious reasons....but everytime I come to a stop with the AC on that engine fan is running and doesn't seem to ever stop....

If I don't use the AC, I get the engine fan only after sitting in Traffic for a while or a lot of town stop-and-go driving, which seems normal to me.

Any thoughts/suggestions appreciated.

Thanks in advance and cheers,

Manu

 

This is normal. The AC coil in front of the radiator needs air moving over it to be efficient.

 

Cool that's good to know.

Thanks a lot for the info man, I appreciate it !

Cheers,

Manu

 

AC on, fan on

AC off, fan dependent on coolant temp

 

While on the AC subject, any quick reply as to why the AC goes on when I start my car even in the snow? Fan related?

 

if your mode setting is on defrost or floor/defrost the ac compressor will turn on. in any other mode it shouldn't turn on unless you have the auto button selected or you have it manually turned on.

 

Thank you! That means if must serve a function for defrosting even if it's cold. I guess I always associated AC with cooling the air rather than 'conditioning'.

 

First ---yes on that fan being on, and it goes beyond efficiency, if u didnt cool the freon traveling through the condenser, it would heat/expand to the point of blowing ur pressure valve and u would lose all ur freon.

Also, keep in mind that an A/C is also a Dehumidifier, thats why it will run sometimes during defrost/defog-----so the air is dry.

 

not really because the high pressure switch would turn off the compressor before it blows through the pressure relief valve.

 

Thats true on vehicles that do have HP switchs, most of the older vehicles just ran LP switchs. I have had them blow when Iv been under the hood and its not a pleasent experience. But u are correct, the Z has both LP and HP switchs but none the less , pushin ur pressure to the 500 PSI + or - that the switch is set at is a little hard on ----- Well----everything.

 

that's kinda more like a side effect... but true

 

Well ---Kind of a side affect----In Industrial Plants and even nice Paint Shops, Refrigerant Driers are used to remove moisture from air. ( EXPENSIVE but highly efficient) Its the nature of the beast, and is taken advantage of for that reason to remove moisture from air that is being used in a car to dry/defog/demoisturize a window