Hoping I can get others here to inform me if there truck acts the same as mine...

I have a K&N filter on my HO V-8, I have reciently noticed that as I listen to the engine I hear an audable click then the water pump starts turning, in about 15 or so seconds another click and the waterpump stops, fair enough as its temp sensor controledI assume, but at the same time I can hear the engine intake (throttle body) open up as the sucking sound increases, then when the water pump shuts off the sucking sound goes back to normal. is this just from the added load on the engine? Does your K&N equipped truck do the samer thing?

Thanks in advance! Glider

 

I have the K&N Air induction system too. I also changed the thermastat but that shouldn't make any difference. But, even before the change, I did not and still do not hear the water pump kick in. I do hear the air intake sucking up that air! And when it rpm's down you hear it exhail.

Safari-Rick

 

I think you mean the A/C pump. Or is the water pump on a clutch? That would be a new one to me.....

 

I assumed it was a water pump, its located on top on the passanger side, its a pump of some kind.... I still don't have a service manual, money is real tight right now.

 

To all, please do me a favor if ya have a V-8 and the K&N, go fire it up (when you can) and listen to the intake and let me know if you can distinguish a difference in the sound about every 15 seconds or so that coensides with a click sound. I would be extreamly greatfull! Thanks!!

 

It sounds to me like it is your A/C clutch kicking the A/C compressor on and off. The clicking noise is the clutch engaging and disengaging.The water pump is in the front center of the engine right behind the fan and is always turning. Do you always hear the noise? If your heater is set on defrost it will kick on your A/C compressor. Change your heater setting to vent at your feet or face, just make sure it isn't on defrost. If you still hear the noise you might want to check on if you need to recharge the A/C.

Oh, and just so you know, the load that the A/C compressor adds to the engine when it is turned onwill give a noticable change in RPM like the one you are saying.

 

Thanks for the reply, I admitedly didn't look deeper into the engine compartment, I feel stupid now, so our waterpump is located behind the fan just like every other v-8, Chev 350, Mopar 318 ect... I confess this is my first vehicle with AC so when I noticed the hoses comming off the pump and heading to the fire wallI just assumed it was a new fandangled water pump... <stupid me>

I noticed the clicking was coenciding with the clutch on the pully, just didn't convey that bit of info.

I do beleve the drfrost was on but I also think the fan was off, I will check that out hopefully tommrow.

It sounds like the AC then adds a good amount of load to the engine, enough to load it down and have the throttle body open up a little more to keep the RPM the same, Thanks for your help!