Dave, I am a “Big Fan” of your efforts and instructions. The thermal fan switch that is on or off has to be in the coolant jacket. PTFE pipe and thread sealant sold by GM, is now found in home improvement stores sold by “Permatex” and designed to provide ground as well as sealing. When fans turn on like other components (Fuel pump, blower fan, head lamps) are cold resistance circuits have what we call, “In-rush” current which drops quickly as they operate. It is peak current that does not last long, but also does not blow fuses. Wiring new circuits I use an amp clamp. Many are cheaper and with direct read out. Hook to a DVOM or Digital Multi Meter (DMM) with a “Min-Max” feature that shows maximum and minimum readings. Great product for a bolt in unit. Those using an “LS” swap, can have the PCM to provide GROUND to a relay using un-used ground drivers to ground relays at different on & off off temperatures creating two fan settings. If A/C is used, be warned that OEM 5Vdc circuits are used to run cooling fans. Either way, Brothers provide a great products to keep you cool. Thanks Dave! DK, ASE master since 78, retired.

Very timely video as I just bought this for installation on my Blazer. I would have liked to see a bit more about the different ways to wire up to the AC pressure switch and a possible dash switch to be able to turn on the fans at any time. The instructions that came with this are less than clear on exact situations but I think they do that because everyone's set up is a bit different and needs some customization. Keep the videos coming Dave!

Thanks I'm doing this on my 68 Impala. Very helpful.

The electric fan Upgrade on an older car or truck is a no brainer. Great video very helpful.

Nice job Dave , thanks

Another top notch video on this channel

Good information! 👍

Thanks Dave - I just Started installing this Same Dual fans System. Yesterday on My 72’ Chevy P/U- wiring Sometime Today . Your Video was very Helpful Thanks

Good video I would like to see how you installed the temperature switch though.

do you need to get an alternator that puts out more amps to handle the electric fans?

How about if im running a champion aluminum rad got a 72 k10 4x4 pick up qnd do they work well

Easy fan upgrade conversation install video does this work for a 2nd gen 55-59 GM truck aswell ohh yeahhh that 72 K5 Blazer is sharp has it been on (Sam's Garage) before.

Love these videos thank you. Are you guys ever going to do OBS Chevy trucks?

How many CFMs are these fans? I didn’t catch it if he mentioned it in the video.

Hello Dave, I am writing you from Mexico. I have a 1971 chevy truck, and I am restoring it. Now, I am installing the air conditioning with ac system; I have a question, ¿could you please advise me where is installed the "air conditioning compressor switch", as far as I know, this switch is located behind the glove box; but I don´t know where exactly it must be collocated. I akcnowledge you in advance. Best regards.

Can you leave out the temp switch and toggle switch and just ground it. Only rely on the ignition wire to power fans?

Question for LS engine: where does the temp sensor go in the engine? Doesn't look like I can replace the digital temp sensor... Do I just run to switch in dash?

What is the colour of the truck

This kit is for fools only is on sale for $400