Posts Tagged: engine overheats
Engine Overheating Causes You’re Probably Missing
The Real Causes of Engine Overheating Explained Quick Summary When an engine overheats, the root cause almost always falls into one of four categories: 1) Coolant level or flow problems 2) Airflow issues 3) Heat transfer failures 4) System pressure loss. The pattern of engine overheating—whether it happens at idle, under load, or both—is the fastest way to narrow it down. • If the engine overheats at idle, I immediately suspect low coolant levels or airflow problems, such as inoperative cooling fans or a restricted radiator (clogged fins). • If … Read More
Engine Overheats – GM vehicles
Engine Overheats No radiator fans on GM vehicles, Chevrolet, Impala, Pontiac, Buick, Cadillac GM uses a pretty nifty technique to control the radiator fans on late model vehicles. The system consists of two fans and three relays. When the powertrain control module (PCM) detects the need for cooling from the engine coolant temperature sensor (ECT) at 223 degrees or refrigerant pressure above 190-psi., it provides a ground signal to the low speed fan relay. Power flows to one fan, and the ground for that fan flows to the second fan. … Read More
Top Causes of Engine Overheating and How to Fix Them
The Real Causes of Engine Overheating Quick Summary When a car overheats, most drivers assume a catastrophic failure. In reality, most engine overheating problems stem from small issues—low coolant levels, restricted airflow, worn components, stuck thermostats, or failing fans—that gradually push the cooling system past its limits. If you know what to look for and how to fix an overheating engine early, you can avoid blown head gaskets, warped cylinder heads, and massive repair bills. Article When I encounter an overheating problem, I follow a strict diagnostic sequence. After decades … Read More