My friend inherited a 1994 Chevy 1500 4x4 with a 350 and four-speed automatic (700r4?). The truck runs well, but there are two problems.
First, the check engine light comes on every once in a while. It doesn't seem to affect the way the truck runs, but he would like to know why the light is on. Every pre-OBD2 vehicle I've owned has some way to pull the CEL codes with a key or paperclip or less. How can I make the CEL in this truck talk to me?
Second, when accelerating there is a gurgling sound in the dash and the heat doesn't get super hot. It doesn't leak coolant on the ground or on the carpets so I'm thinking there is an air bubble in the cooling system. How do we get rid of the air bubble?
TIA
jump pins A and B on the ALDL - a and b are the top right two terminals. there are only i think 4 wires hooked up to the connector so you'll be able to tell which ones a and b are by looking to see which holes have a terminal in them.
Thanks, but where is the ALDL?
If it come up vacuum leak, start with something in the intake manifold area... could be both problems at once
A lot of the chevy stuff the a/c controls are vaccuum operated. When stomping the gas, the vacuum presure is probably dropping enough that the heat door is closing some. You loose heat and the vacuum operators make a little noise when moving. Had a older chevy truck that used to so the same thing.
The ALDL is located under and at the edge of the dash. Usually at the left of the steering column.
Toyman01 wrote:
A lot of the chevy stuff the a/c controls are vaccuum operated. When stomping the gas, the vacuum presure is probably dropping enough that the heat door is closing some. You loose heat and the vacuum operators make a little noise when moving. Had a older chevy truck that used to so the same thing.
heh, was the opposite in my ford, sucks in the summer when you pull away from a light and the heat starts blasting you in the face. turned out to be a cracked vacuum hardline under the hood.
