[Mr.Fixxit]

A guy pulls up too my shop, and it's my brother. He just bought a 1993 Chevrolet Cavalier with about 71,000 miles on it. He said he's been driving it for about 2 - 3 weeks. And, everything has been absolutley wonderful. But, today he says that it over heats ( the cooling fan is NOT coming on ), the ABS light is on, and none of the A/C or Heater controls under the stereo are working. So far we've swapped a few relays under the hood, and in the fuse panel. But too no luck. Can somebody possibly give me a tip to what might be the problem? Thnx.

[Rexnfx]

Have you checked fuses? Specificly the HTR-AC 25AMP fuse. This seems to be the main power feed for all of the complaints you list. Don't just test light it, pull it and check resistance too. Or unless you see, its blown, or spades have come apart.

When there are a few things that go wrong at the same time. You want to look at what could control all of those systems at the same time. The heater controls, cooling fan, ABS. But a wiring diagram is a must, to know what circuits run on same feed or grounds.

If you want to check the coolant fan relay voltage feed. Disconnect it and use a test light to see if you have power on two of the spades in fuse block, while the ignotion key is on.

I won't mention amps(current) at this time. I would think the fuse is out. But if the fuse is out. Then, one must figure out why the fuse blew. NOT, just put a bigger one in or use 22 bullets, tin foil, things like that Not that a bullet would fit here, but they do in older cars, and people use em, haha.

Cause/effect, a blown fuse is not the cause, its an effect of too much power(current) going through the circuit. Check that fuse

[Mr.Fixxit]

Thanks for the info. Will try to trace out that fuse, and go from there. I love the 22 cal bullet idea.

[Mr.Fixxit]

Checked Fuse, even replaced fuse, checked all connections. I even Checked on the relay connections. Now, the cooling fan works. But the ABS light is on, and A/C + Heat Controls still don't work.

[Rexnfx]

Bummer, was thinking the fuse would have been the silver bullet repair we all like Well, if the problems we're not related to the same supply power. Then it would be best to start off by pulling the ABS trouble code. And probably checking power to heater controls and blower motor.

[Mr.Fixxit]

well, after monkeying around the electrical system, checking for voltage at fuses, and ac controls, along with checking odd and end connections. the AC / Heat work when it wants too. along with the abs light, it goes in and out...,,