Jdmsc5spd

I am stumped I supercharged my sc400 and it only overheats when the a/c is on I can drive 20-30 minutes it is fine any longer it gets hot and will throw a code 55...I replaced the radiator with a koyo 3 row 160 t stat 2 shrouded zirgo fans and water wetter still nothing.... Checked a/c pressures low 35psi / 250psi it does not idle up when the a/c is engaged...any help is appreciated pulling out my hair there is no white smoke or oil in the coolant vice verse only other thing I can think of is a dragging a/c compressor it was making lots of vibration months ago then all the sudden stopped a/c works still or a weak water pump

t2d2

iTrader: (8)

What makes you think it's overheating? Code 55 is knock sensor #2.

I had a lot of knock sensor problems a few months back, but they've subsided of late. It happened more frequently when the A/C was on, especially accelerating onto freeway on-ramps. I finally tested it out on the highway with A/C this week and had no issues, "knock" on wood...

The things I did that seemed to have the most impact on cutting back the knock sensor trips were replacing all the dry old vacuum hoses, and getting the bad gas (*$%#@! dealer) out of the system and using several bouts of fuel system cleaners.

Jdmsc5spd

I think it's overheating cause the needle will go past 3/4 and turn the a/c off will come back down....I'll take a look at the vac lines

t2d2

iTrader: (8)

Okay, that's sound reasoning.

One of the common causes of knock sensor codes, supposedly, is degradation of the sub-harness because of its location and getting cooked over the years. If your car is indeed overheating, maybe some worn wiring is sensitive enough to trip it?

Jdmsc5spd

Yeah I just replaced a knock sensor plug trying to fix this issue found it cracked and broken on the passenger side of the engine idk if this number 2 or not...still no dice I'm more worried about the over temping

SC4ME

maybe bad water temp sensor :/

Jdmsc5spd

It's been replaced before but I haven't done the sender

Rhoderman

iTrader: (1)

How is your fan clutch?

Jdmsc5spd

No fan clutch removed hyd fan and installed e fans on a relay if that's what you mean

Jdmsc5spd

Any ideas?

Rhoderman

iTrader: (1)

Missed that. Sorry.
Are those fans moving a lot of hot air when they're running?
Does a water spray on the radiator fins help any? Common t-shooting step.

Jdmsc5spd

Yeah they seem to be moving a fair amount of air they are rated at 2700cfm each, yeah when I spray water through the condenser to the radiator it seems to help cool it down I'm going to be adding a extra 8in condensor fan see if that helps it

aj007

It's crazy how many people don't come back to tell us if and how they resolved their problem.

Jdmsc5spd

Sry forgot I replaced zirgo fans with 18in the thinder bird fan and put one 10in pusher fan and cut a vent in the hood where the supercharger is and found a bunch of unseen leaks on heat lines and heater valve cracked. For the code I replace knock sensor plug so far so good a/c on in 115 here in Vegas I get as high as 230f im usuallly still around 210f-220f i usually run about 180f-200f with no a/c..if I start to get warm I installed a water sprayer for intercooler and condesor. Soon I'm going to get a vented cf hood should help a lot