![]() Yes, I said this twice, but it's important. Obviously, you should never attempt this DIY auto repair operation on a warm engine. On the V6 models it's a little further back. On the V-8 Chevrolet models it's next to the number one spark plug wire boot. On both the V6 4.3 L Vortec engine and the 4.8 L, 5.3 L and 6.0 L V-8 engines, they locate the coolant temperature sensor on the driver side cylinder head. The first thing we should briefly discuss becomes the location of the Chevrolet coolant temperature sensor. Replacing the Chevrolet Coolant Temperature Sending Unit This is one of those defective computer monitored sensors that can lead you down the wrong path of diagnosis with a misleading symptom list. The root cause of the issue pointed back to the Chevrolet coolant temperature sensor. The owner also stated the engine cooling fan ran all the time on some days. On the second vehicle a 1999 Chevrolet Tahoe, the driver's complaint became a air conditioning system not cooling properly. In fact, when the customer called me to set up the appointment they said they thought the crank sensor was going bad again. The driver felt the symptoms of the coolant temperature issue and that of the crank sensor problem remained similar in nature. This Chevrolet truck had a bad crankshaft sensor six months ago. Here's the point I wanted to make on this particular problem. If you can imagine the difference in the fuel mixture required to run an engine at -30☏ than at 80☏ then you can understand why this truck ran poorly and stalled. The current outside temperature remained in the low 80s. When I pulled the data stream up on my automotive scanner the coolant temperature read -30☏. This is the vehicle that set the P0128 for the engine coolant temperature below threshold. The customer complained the check engine light was on, the truck ran poorly and stalled occasionally at idle. The first Chevy truck was a 2003 Silverado with a 5.3 L V-8 engine. Let me use the first and second vehicles that helped me discover this common malfunction as prime examples of the varied symptoms. What we also need to make clear is the symptoms associated with the bad Chevrolet coolant temperature sensor can vary greatly. This doesn't mean that every vehicle that has one needs one replaced, but it appears that very few of these trucks will make it through its natural life cycle with the original coolant temperature sender installed. Chevrolet Coolant Temperature Sensor Symptomsįirst, let's clear the air and state that this particular Chevrolet coolant temperature sensor is not known for its extreme reliability. With that said, the coolant temperature sensor discussed in this post finds its way into many other Chevrolet, Buick and GMC truck engines. This includes the 4.8 L, 5.3 L and the 6.0 L workhorse engines. You'll need a 19 mm deep socket, but a 3/4 standard size also works.Īnother thing to mention, in this article we're concentrating on the Chevrolet V-8 engine. With the radiator cap removed it flows like a tidal wave. If you leave the radiator cap on it comes out slowly. Also remember if you do uninstall it that coolant will come out. Obviously, only remove the sensor on a cold engine. If you can find the number one spark plug boot you'll find the sending unit. In this article we'll talk about how to determine the coolant temperature sensor is actually the problem with the vehicle and not the other possibilities that exist.Ībove you'll see the component location diagram for the coolant sensor. Sensor, replacing the thermostat and water pump becomes a for sure waste However, if the failure is with the Chevrolet coolant temperature ![]() Especially since, problems with the water pump and finding it necessary to replace the thermostat on vehicles with over 100,000 miles remain a real possibility. It's easy to buy into this type of quick diagnosis. With that said, a quick search on the Internet might lead one to believe replacing the water pump will take car of the issue. This allows them to enjoy better reliability than the parts of the past. I think they improved the manufacturing process on these moving parts. However, it's usually on high mileage vehicles or ones with neglected coolant systems. Sure cars and trucks still need thermostats replaced once in a while. This was a common repair back in the day, but not any more. Retrieving this trouble code might lead you to believe it's time to replace the thermostat. That's the official definition from my OBD II diagnostic code book. The trouble code stands for coolant temperature below thermostat regulating temperature. The perfect example is when this part sets a code P0128 in memory. The Chevrolet coolant temperature sensor problem remains one of those issues that can mimic or lead you to believe other problems exist with the vehicle.
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