93rx74lyfe

iTrader: (1)

when i run my ac the temp goes from 190ish to 210 or 220 in seconds. is this normal? also im very confused if, or how long i can run the defroster/heat because the guys at RP said i could over heat the engine! is there a way i can run my ac, because this 100+ weather is killing me!

93rx74lyfe

iTrader: (1)

anybody......

xblazinlv

When you turn on the a/c, the condenser puts out hot air in front of the radiator. That's why it gets hotter.

Turning on the a/c should turn your fans on hi-speed as well. Do you have the stock radiator still?

matty

my car does this as well.

GoodfellaFD3S

iTrader: (213)

Make sure your fans are working properly.

I removed my a/c back during the texas summer of 2001 and haven't looked back. My motor runs nice and cool with the fluidyne exposed to all that incoming air. Of course, I have a company car with rockin' a/c, so it's not really an issue for the FD be a/c-less

moehler

iTrader: (12)

Same here . Car runs much cooler and I hated the way it driived with the A/C anyways.

matty

yeah i dont liek having the ac on either. its a weekend car so i only need to drive it when conditions are nice. i will removes the ac one day. is hard to do?

adam c

iTrader: (2)

I love my AC. Wouldn't think of removing it. It would really suck to be driving in my nice car, and hate it because its too hot. Get a fan switch to keep the engine cool .

FYI, did you know that your car will get better gas mileage on the freeway with the AC on?? Thats right!!! The improved aerodynamics of the car, at freeway speeds with the windows up, more than makes up for the extra load of running the AC. That's a fact !!

matty

did u see that on myth busters? lol. i could have sworn they couldnt reach a definitive answer.

F0RSAKEN

Less drag = better fuel efficiency....

skotx

My car used to over heat with the A/C on. I discovered that the relay responsible for kicking the fans up to high speed was completely missing. You never know what goofy stuff the previous owner did to your car.

93rx74lyfe

iTrader: (1)

i have a big Koyo radiator, but have not done the fan mod yet. what about in the winter, is it okay to run the heat without messing with the engine because im sure this winter is going to be cold

matty

my car was stock with 15k miles when i bought it.

where is this relay?

matty

actully does anyone know how i could tell if my fan kicks onto high?

adam c

iTrader: (2)

You should be able to hear the change in speed, from outside the car. Pop the hood, and let the car idle until the fans come on. Have someone else turn on the AC. You should hear the fans go to a higher speed. You should also be able to feel more air pressure when they go higher.

xblazinlv

Running the heater actually makes the car run cooler

So no issue there

Have you tried running a little bit more water in the mix with a bottle of water wetter? Or do you run 50/50 antifreeze to water?

skotx

The fans relays are located on a bracket on the passenger firewall. There should be four of them.

Speed of light

iTrader: (8)

I use the A/C all the time and my '93 doesn't run significantly warmer [now] with the A/C on. This is with the STOCK radiator, thermostat and a 50/50 antifreeze/water mix. No tricks or fancy radiators and it works just fine, even 100+ days while going uphill. Seriously.

What did make a big--and surprising--difference in stablizing operating temps on this car was the relocation of the battery out of the engine compartment (to the bins). I suspect that it substaintially improved airflow through the radiator by getting some of the clutter out of the engine compartment. I have long contended, as have others, that it's not the size of the radiator that is responsible for the FD's cooling issues; rather, it is the lack of airflow over the radiator and condensor that has been problematic.