No AC with FAST?

[4C FED]

Summer's around the corner and I tried the AC today.
It no worky.
How can I set up the AC to turn on now?

 

[TurboManiacal]

E says in Raliegh, NC you don't need AC in a little black truck. I say he's nuts.

 

[4C FED]

Uh, doesn't it get quite humid there?

With numerous 100+ days here, it is not an option.

 

[TYPHOOL7]

i live in los angeles, i have a fast and no ac, i got windows. :lol: :lol: :lol:

 

[smeagol]

You need to check the AC turn on/off wiring.

I believe the way it works is that the stock ECM does not control the AC on/off, but can override and turn it off, as in when you are at WOT. Check to make sure that circuit is setup correctly. It may be that you have to ground or put 12v to a wire to have the AC come on.

Some people have used a Hobbs switch to turn the AC off in this circuit (so at x psi, the AC is off, similar to how the stock ECM can turn it off).

 

[keith455]

With the PTE harness my A/C works but it won't shut off at a certain RPM like the stock ECM would.
If i'm going to get on it i just turn the A/C off with the switch.

 

[protosy]

or use a hobbs switch that will shut off ur ac after like 3lbs of boost.

that is what i am going to do.

chad

 

[4C FED]

I guess I'll have to hot wire the clutch and make sure it still works, then go from there.

Thanks,

 

[myclone]

FWIW... Something to poss think about is the stock ECMs command to bump the idle up when the AC is switched on. I dunno if the FAST has the capability to accept an input/command like that but something to think about if you don want the eng to stall when the AC is switched on while in gear at idle.

Damn... Im learnin all kinda stuff about FAST in the last week or so.. Whoo Hoo. Keep the posts comin Rick

 

[nightdiver]

4C FED
What kind of harness do you have ?

 

[4C FED]

4C FED
What kind of harness do you have ?

I have the one from PTE.

 

[nightdiver]

is it a plug anD play ?

 

[4C FED]

Yes, for the most part.
I had to add the electric fan line and connect, of course, the 12V & ground wires.

 

[nightdiver]

For the A/C we must ground the 459 DK GREEN /WHITE THAT GOES to GF1 to the old ecm. This wire goes from the relay to the ecm and the ecm controls the A/C
For the fan history now i bought a fan from a mercedes 200 compresor that is very very powerfull, but id like to ask you first if yous is good like the stock fan ???????

 

[4C FED]

For the A/C we must ground the 459 DK GREEN /WHITE THAT GOES to GF1 to the old ecm. This wire goes from the relay to the ecm and the ecm controls the A/C
For the fan history now i bought a fan from a mercedes 200 compresor that is very very powerfull, but id like to ask you first if yous is good like the stock fan ???????

Thanks for the info.

I'm running 2, 11" SPAL fans with a Griffin radiator, Evans coolant & a 160 deg. thermostat.
So far cooling is not an issue, seems to stay right around 155-160, but then it has only been in the mid 70's so far. Not sure how it's going to do when it hits 100 & the AC is on.