WHEH AND ONLY WHEN I use my z/c my low water light comes on any idea why my water coolant is never low anyone eles had this problem

 

ya i have the same problem but it comes and goes with or without the a/c on. i had a gm tech take a look and he says its a common problem with the low coolant sensor on 93-97 gm vehicles. you can see if when looking at the radiiator from the top a little square box on the left side about 3 inchs down.

 

Are you sure about that? Go for a week without a/c and tell us what happens.

 

If it's anything like our Subaru the engine coolant temp sensor was not reading the correct resistance for the PCM. I also would turn on the AC and I would throw a coolant temp circuit code 0015. I checked the fans, relays all were good. I changed out the sensor and no problems since.

I did like shoebox suggested. I cleared the code the first time (Autozone will read and clear the codes for free) then drove around for about 4 days or so then hit the AC again and 5 minutes later she threw a code. If that is your problem there's a coolant temp sensor near the bottom of the waterpump housing, that is the one the PCM uses for engine management.

There are 3 coolant sensors on the LT1. The waterpump for engine management. The radiator for coolant level and the head for the temp gauge. I do not know if they are all connected on the same circuit.

 

i've gone for a month with the air off the first time i used it and never came on like i said only when i used the a/c. The temp sensor fell out on my once duno why and hasn't done it anymore so heck if i know

 

Next time try unplugging the RAP module and see what happens. Check the ground on the post under the LH kick panel also.