Rx7TyreBurna

iTrader: (1)

So, I finally got an e-fan in. My stock fan never turned off, so the temperature only went partially above cold.

Now that I can reach half way through the full range. What should i re-check? I will check TPS.... anything else?

HAILERS

See if you have a thermostat in the thermostat housing. The stock elect fan in front of the radiator can't stop an engine from getting up to full temperature.

The stock fan in will run continuously if the green/black wire is not plugged onto the water temperature switch on top of the thermostat housing.

Rx7TyreBurna

iTrader: (1)

Thanks HAILERS. I do have a thermostat.

Isn't the stock fan controlled purely by the temp of the engine? I.E. It gets too hot and the clutch engages, cools the car, and then when cool, the fan disengages?

I checked my connection on the back of the thermostat housing and it is ok. I did however replace the connections on the bottom of the radiator. Now that I think of it. Is this the temp sensor that sends to the dash? The old ones were barely on there, cracked and broken looking.

g14novak

iTrader: (1)

Aren't the stock elec fans in the engine bay for cooling the condenser for the A/C system?

And you have a S4 correct? Isn't the S4 temp gauge only suppose to go 1/4-1/3 of the way up for full operating temp? And S5 goes 1/2 way?

I was under the impression that the clutch fan was always on and the clutch was to actually slow it down at high rpm.

And the connection on the radiator is for your coolant buzzer. The one that goes to the gauge in the cluster is located below the oil pressure sending unit.

Rx7TyreBurna

iTrader: (1)

Hmmm, i thought the sensor on the top of the radiator, single wire, was the sensor for the coolant buzzer. I'll have to double check the FSM.

My car had no electric fans stock. And i had A/C. Maybe on a different model they came with electric fans?

Malikai229

iTrader: (4)

No electric fans stock on any model...and yes the s4 temp gauge is only supposed to go about a 1/3 of the way while the s5 is halfway...

HAILERS

There is a stock electric fan located in front of the radiator/oil cooler on some cars. It uses a water temperature switch on top of the thermostat housing to trigger it on or off. IF that wire is left off the temperature switch, then the electric fan runs all the time.

I use the word STOCK meaning made by MAZDA vs the AFTERMARKET fans.

I mentioned that temperature switch is on top of the thermostat housing, not the radiator.

When you said your stock fan never turned off, I ASSuMEd that it was the electric fan in front of the radiator. What other fan won't turn off is beyond my limited knowledge. Well I guess the stock mechanical fan could be a problem that sense, maybe.

The stock electrical fans function can be found in the online FSM and its wiring in the wiring section of the FSM. Page called COOLING FAN SYSTEM.

Rx7TyreBurna

iTrader: (1)

Thank you!

g14novak

iTrader: (1)

I just re-read your original post. You took the stock fan off because it was keeping the car too COLD?

Why would you want the car to run hotter? Hotter = power loss...

Rx7TyreBurna

iTrader: (1)

There are a couple reasons. And, cold doesn't = more power.

First, the drain caused when accelerating by a mechanical fan which is always on, is terrible. Not dramatic, but it does suck.

Also, vehicles are made to work at a specific operating temp. You don't want your car to always be "cold".

danielson

you know that the thermostat controls the engine temp not the fan. the fan is there to move air when the car is stopped through the radiator. whenever the engine goes above a certain temp the thermostat opens and lets in the cooled coolant through the engine to cool it down. oh and the fan is free wheeling for the most part until the engine temp reaches a certain point. it just spins kind of like spinners do when the clutch fan is not engaged, you can actually stop it by hand. i have done it and lightly revved the engine ( i would not recommend trying this)

g14novak

iTrader: (1)

Just a side note, removing the clutch fan doesn't make the car have more power, it just frees up power that was previously being used to spin the clutch fan.

And you interpreted what I said wrong. A car that is running below op temp but still a reasonable range (140-170) IS going to produce more power than the same motor at operating temp (180-200). Why do you think turbo guys try to keep the motor and air going into it as cool as possible? At or lower than OP temp = higher #'s.

You ever been to the track and see supercharged/turbo'd cars with icebags on the motor and SC/turbo before they even make their first pass? Theirs a reason.

Rx7TyreBurna

iTrader: (1)

Interesting. I figured people made their air charges cooler because the O2 density is higher when colder. Didn't know it was to make the engine colder. I have seen people put ice on their intercoolers. Though, never on their engine.

I must have mis-stated. I know it doesn't add power. But, did free up power from my fan which was stuck on.

Thanks for all the replies. Though a bit off topic. Informative non the less.

Rx7TyreBurna

iTrader: (1)

I had read that the clutch fan only really kicked in when at a certain temp, and at higher RPM's it would disengage or slow down slightly. Mine, was always engaged. After removing it, grasping the fan, and the place where it bolts up, it would barely spin. Almost completely stuck. I know what it should feel like, I have felt a working one, which spins mostly freely, with a little bit of resistance.

I knew about the thermostat. Had to replace it about 2 years ago when the old one failed. One of the first things I look at when the vehicle starts to overheat. Old one would never open. Replaced with OEM (mazdatrix) thermostat, no more overheating.

HAILERS

*********Replaced with OEM (mazdatrix) thermostat, no more overheating.
************************************************** **********************

Ah, Ha! Says I. I've bought Mazdatrix thermostats in the past. Both opened at 160*F. Pissed me off and still pisses me off. Should be opening at 180*F. There was no number on the two thermostats I bought from them stating they were 160*thermostats. Ugggh.

Rx7TyreBurna

iTrader: (1)

Better place to buy them?