One speed fan to 2 speedi
#1
Registered User
Thread Starter
One speed fan to 2 speedi
Last year, I fitted A/C to my 1991 1.4 Fiat Tipo, with the larger radiator and condenser from a 1.6 model, trinary switch added. The 2 wire fan was made to run at 2 speeds using 2 relays, a resistor and a three wire, 2 temp thermal radiator switch which are not currently fitted.
No wiring diagram is available for this setup, but I've drawn a diagram of the wiring taken from the donor car with two (Earth?) wires unaccounted for.
Until wiring sorted, fan cuts in at high speed only, to cool A/C condenser and or hot engine coolant.
I'd like the fan to work on slow speed as well.
No wiring diagram is available for this setup, but I've drawn a diagram of the wiring taken from the donor car with two (Earth?) wires unaccounted for.
Until wiring sorted, fan cuts in at high speed only, to cool A/C condenser and or hot engine coolant.
I'd like the fan to work on slow speed as well.
#2
Are you asking for help or just letting "us" know it can be done.? LOL
#5
Better to use a PWM controller. Will allow the fan to run at any speed you want. I have something similar on my fuel pump
https://www.summitracing.com/parts/d...jpORoC6mHw_wcB
https://www.summitracing.com/parts/d...jpORoC6mHw_wcB
#6
Depends on the fan you're using.
Here are two setups I've successfully wired on two different style s of 2-speed fans.
You can run a 2-relay, 2-speed setup with something like the Taurus fan where low speed activates 1 relay and high speed activates another relay. You just have to tune the PCM so that low speed is off when high speed is on.
Or you can run a 2-relay, 2-speed setup on a Derale fan where low speed activates 1 relay and high speed activates both relays. This is also adjusted via PCM tuning (This is the setup I'm currently running in my LS swapped Wagoneer and my friend's LS swapped Wrangler)
Here are two setups I've successfully wired on two different style s of 2-speed fans.
You can run a 2-relay, 2-speed setup with something like the Taurus fan where low speed activates 1 relay and high speed activates another relay. You just have to tune the PCM so that low speed is off when high speed is on.
Or you can run a 2-relay, 2-speed setup on a Derale fan where low speed activates 1 relay and high speed activates both relays. This is also adjusted via PCM tuning (This is the setup I'm currently running in my LS swapped Wagoneer and my friend's LS swapped Wrangler)