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Posts Tagged: engine overheats

Engine overheats — how to diagnose

Engine overheats — What to check Engine overheating can be caused by many things. But to diagnose it properly, we need a bit more information. • Is it overheating at highway speeds, or • Is it overheating in stop and go traffic, or • Does your car overheat only when stopped and idling? First things to check if your car is overheating in city driving or at stops. #1 Check your coolant level. If there’s no coolant in the reservoir, you’ve got a leak or a head gasket problem where … Read More

Mitsubishi Overheats

Fix a Mitsubishi that Overheats Many Mitsubishi vehicles use a variable speed setup for their radiator cooling fans. The computer monitors engine temperature, vehicle speed, and detects whether the A/C is on. The computer then tells the fan controller engine cooling needs and the fan controller drives the radiator fan and the condenser fan. If you’re having overheating problems, check the usual suspects. But also make sure BOTH fans are working properly. Because if the radiator cooling fan is not working, the fan controller will kick on the condenser fan … 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

Car overheats – Chrysler Vehicles

Car overheats – Chrysler products People always ask why their Chrysler car overheats. Aside from the mechanical reasons explained here, Chrysler products rely on a solid state radiator fan relay that can cause problems. The relay is usually mounted in the front of the vehicle on a frame rail. That’s great for cooling the relay, but it also exposes it to lots of water and salt. Since the relay is solid state and provides almost 40-amps to the radiator cooling fans, it can get quite hot. The frame rail is … Read More

Car overheats – most common causes

Car overheats— most common causes There’s no simple answer as to why your car overheats. It can be a mechanical issue like a failed water pump, a plumbing issue like a clogged radiator, an electrical issue like a bad radiator fan, or an internal engine failure like a bad head gasket. Here’s what to check when you have an engine overheats condition. . What to check when you car overheats Check coolant level first if your car overheats Low coolant makes the car overheat at idle but the temp gauge … Read More

AC blows warm air on GM vehicle

AC blows warm air on GM vehicle How to diagnose an AC blows warm air condition on a GM vehicle I’m using a 2004 Chevrolet Malibu for this article. But other car makers use similar systems. Start by opening the PDF to the right. It’s a typical wiring diagram for a GM AC system. If you have an older vehicle or your vehicle is overheating, skip down to the EXCEPTIONS at the bottom of this article. After you’ve read this, get your hands on the diagram for your particular vehicle … Read More

P1489 and overheating 300M

 Fix code P1489 and overheating 300M Owners who have an P1489 and overheating 300M with trouble code  High Speed Fan CTRL Relay Circuit, here’s what to do. Remove the high speed fan relay and use a digital multimeter to check for power on the two terminals of the electrical connector. If you show power, reinstall the relay. Then ground the dark blue/light green wire at pin 69 of the PCM. The relay should click. If it doesn’t try swapping in a new relay or run a continuity test on the … Read More

Why does my engine overheat

How to diagnose and fix an engine that overheats I can’t tell you how many times I see forum participants write in and say their Engine overheats and they drive. Sure, they pulled over and let it cool down along the way. But now they’ve got a car in their driveway that won’t crank, or will crank but not start, or now has coolant in the oil. With aluminum engines and heads, the Number One Rule when it comes to overheating is PULL OVER. TURN IT OFF. CALL A TOW … Read More

Chevrolet Cobalt Overheats

My Chevrolet Cobalt Overheats There’s quite a bit of overheating chatter about this vehicle on tech forums about Chevrolet Cobalt Overheats. If the cooling fans come on, try bypassing the heater core with a length of heater hose. If the problem goes away, you’ve got a plugged heater core. Also, check the hose from the engine to the overflow (surge) tank to make sure it’s not plugged. If the cooling fan doesn’t come on, check the #1 (30A) fuse in the underhood fuse box. If that’s good, move on to … Read More


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