AdamMac

Hi I have a 1995 LT1 Camaro once the engine worms up the check engine light and cooling fan comes on and stays on (it takes about 5-6 minutes). What could be causing this I checked the fuses and relays the only thing I found was a burnt fuse for the air pump.
I also noticed that the alternator is over charging the battery causing the battery to boil over. Not sure if this is related????
I tried changing the computer but the same thing happens. And I tried to read the codes but the scene tool will not link up with the car.

Any thoughts

Thanks Adam

shoebox

You'll have to scan it to see what is causing the trouble code(s). The fans are supposed to come on when most codes are detected. Give more detail on what you are trying to scan with.

AdamMac

it has a OBD2 plug but no OBD2 scaner will link up i tried a mac tool and a snap on and a cheep one nothing if i use a the mac tool and the OBD1 plug and jumper the pins all i can get is a esa29 electrical falt thats it

shoebox

You can't use an OBD-II scanner. It must be an OBD-I scanner with the correct adapter cable or a normal 12 pin cable adapted like this.

If you are actually getting a code 29, that's for the AIR pump. Check the fuse. Check the link in my sig for a list of applicable trouble codes.

AdamMac

that the jumper that i used to read the computer and get that code i have replaced that fuse and still get the code even after clearing the codes.

Injuneer

Did you check the AIR pump fuse to make sure it didn't blow again after you put the new one in? Common problem. The AIR pump rusts and siezes up, drawing excessive amps. There is a factory recall on the AIR pump (95-97), so if that's the problem you should still be able to get a dealer to do the recall repairs for free.

If the alternator charging voltage is so high that its boiling the battery acid, you should also have a code for the system voltage being too high (DTC 53). Might want to fix the problem ASAP. The boiling acid generates hydrogen, which is explosive. Neighbor of mine had a fire in his garage when his brand new Infinity Q45 overcharged the battery, it expoded and set the car and the garage on fire.

AdamMac

the altinater is sending 75amps to the battery at 14.2 volts at a idel.

i am not getting a code for the altenater but only esa29 code

i am looking in to the fuse

shoebox

DTC 29 = Secondary Air Injection (AIR) pump circuit. I'll remind you again that you can view the proper code list linked in my sig.

AdamMac

thanks shoebox i look at that and took what the others were saying and this is what i have came up with

1 the altinater the regulater is done and i need a new one sence it is chargen at 75amps no mater what i try to do or what is running.

2 the ses light and the fans so i pulled the code DTC 29 and i found that the air pump fuse was blown. so i unpluged the air punp and put a new fuse in and now it runs fine with not fans on and no light. so i gusse that means that the pump is seized and i need a new one.

am i going in the right direction????

thanks

shoebox

Sounds reasonable.