How the Auto Cool controllers operate:

The sensor is measuring the OUTFLOW temperature of your radiator

and then sets the fan RPM to regulate the OUTFLOW temperature you have dialed with the black knob. So if you have set the OUTFLOW temperature 10 to 20 degrees F. below your thermostat temperature you will have rock solid engine temperature. Use a laser temperature gun at the OUTFLOW to

check your regulation. Check it parked and motor at an idle.

Also keep in mind, that three things are going to effect the fan RPM.

First is your speed, second is motor loading, and outside air temperature.

Starting your engine for the first time you will NOT see the fans start.

I do not want to hear the BS term "KICKING ON." When the radiator has reached about 140 F, +/-, the fan or fans will start to turn slowly. The fan(s) will increase RPM and reach the point of regulation that you have set with the black knob. For A/C fan speed control, there is a small pot on the side of the controller that sets this fan speed. The radiator control will over ride this fan speed.

Brushless fans: If you have this type of fan, it will fibrate at low RPM unless your purchase our 7Khz HF-125 controller.

Our controllers have Soft Start that limits inrush current from starting a dc fan motor from a dead stop. This is what brand X controller boys fail to realize and why their controllers keep burning out. Auto Cool also has a cool down timer, so when you turn off the ignition, the fans will operate for under a minute.

YOU CAN REACH US VIA THE PHONE OR

EMAIL JUST ABOUT 7 DAYS A WEEK.

DARRYL THE AUTO COOL GUY

562-367-3225

If you return a controller for test or repair, please put your full information in the package with name, address, email and phone number! It really helps us getting it back to you fast!

The On Line Store Page 1 below. . . .

Hey Auto Cool Guy,

Returning customer here. I bought one of your boxes for a project car a few years back but I have a new project I need your help with. I have a Jaguar V12 and I recently replaced the radiator with a Wizard cooling unit with two 13" high performance fans. Each fan is rated about 20 amps.

ATTENTION:
YOU WILL NEED THE HF-125 FAN CONTROLLER @ 7,000 HZ IF YOU HAVE A BRUSHLESS FAN MOTOR.

If your run a brushless fan on a low frequency controller, the fan will vibrate out of control at low RPM.

ATTENTION PLEASE:

BE SURE YOU HAVE FULL, COMPLETE, AND CORRECT SHIPPING ADDRESS ON PAY PAL WHEN YOU PLACE YOUR ORDER! IF YOU MAKE A MISTAKE YOUR CONTROLLER WILL BE RETURNED. IF NO ADDRESS PROVIDED, WE WILL HAVE TO EMAIL YOU FOR IT. THIS CAN CAUSE DELAYS IN YOUR CONTROLLER SHIPPING.

I made this video of the DX-150 - how it works on the bench.

DIESEL RADIATOR TEMPERATURE CONTROL

Steve installed the DX-150 in his vehicle and made this video during the process.

US ARMY ORDINANCE

295TH FROM HASTINGS & GRAND ISLAND, NEBASKA 10-68 TO 10-69

We have been building the Auto Cool Controllers right here in the USA starting in 2011. We build what the customers wants.

The Auto Cool Guy supplies the Standard Brass Sensor with your controller. However, if you purchase a Brass Plug Sensor or one of the Copper Inline Sensors, we do not supply the Standard Brass Sensor as the default sensor with your order.

READ THIS BEFORE YOU PLACE AN ORDER!

Due to lost shipment outside the USA, we highly recommend that

your package be shipped via UPS with a tracking number. Please

email for an extra cost involved. We are having problems with the

USPS and over seas mail system and frankly getting fed up with the

covid excuse and short of employees. We do not want to have your package get LOST or STOLLEN in the mail.

Thanks for understanding, The Auto Cool Guy

The HF-125 is our new high frequency controller that operates at 7,000 Hz. This is the controller you want if you are going to power a BRUSHLESS fan motor. It will also power any brush type motor. It will prevent fan buzz found in some Asian fans. It has soft start and the cool down timer. We fixed the fail safe problem that now puts this controller to 100 percent RPM when pin 7 is grounded. This controller can run one or more fans. Two large 1/4 inch brass studs for fan and ground power. The top and bottom of the HF-125 is made from 1/8 inch aluminum plate for a heavy duty heat sink. The top case in powder coated.

HF-125 7 KHz PWM CONTROLLER

$245.00

HF-125 7 KHz PWM CONTROLLER

See our return policy data sheet