Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
HelloCustomer Is the temp guage reading correctly?
Your JA Expert,
Ok, since you commented that the guage moves rapidly up and down and you have the engine and mileage that you indicated, I suspect a faulty headgasket is a strong possibility. It is very typical on these engines and is usually discovered after spending serious money trying to rectify the situation unsuccessfully. You need to confirm if exhaust gases are entering the cooling system. If they are they will displace coolant with air and very high temperaures. Once the air is introduced into the cooling system it pockets in the heatercore and causes a no heat condition. There are 2 methods for confirming this. When the vehicle is warm or running hot, the vapor emitting from the coolant bottle is sampled using a cylinder block tester. This is a cylinder that contains a blue fluid. A hand vacuum pump is used to draw the vapors through the cylinder and if exhaust gases are present, the blue fluid with change to green and then to yellow. Any change from blue at all is confirmation of exhaust gases entering the cooling system. The second method is using and emission analyzer. The exhaust probe is place above the coolant bottle and the sniffer will react to exhaust gases if present, with an increase in the hydrocarbons (HC) on the emission analyzer. This too would be confirmation. I suggest this because this is where you should start to avoid spending so much money that other spend only to find this is really where the problem was.
Yes, you will have no problem tackling this project yourself. Here is the procedure to remove the trim plate. Once off, just remove the 4 bolts that secure the cluster into the dash. Won't take you long at all.