![]() There's a leak somewhere in the engine coolant system causing the radiator fluid to leak out.Ģ. There are basically two possible causes I can think ofġ. A few owners have actually lost that belt (due to excessive wear of the belt or the pump bearing failing) and had no idea it was gone - then wondered why the engine was overheating. While looking at the engine coolant pump bearing, inspect the serpentine drive belt which spins the pump pulley. ![]() If the cabin heater produces good heat, at least the coolant loop through the cabin heater core does not have air in it.Ħ. The leak is the main problem that needs to be immediately fixed or permanent engine damage will result (if it has not already happened).ĥ. The engine coolant valve is not causing the leak or the overheating issue. Each time you allow the engine head to reach 245 degrees F (due to lack of coolant at the temp sensor), you are causing engine damage.Ĥ. 212 degrees F is boiling temp for pure water. The correct engine temperature is near 82 degrees C or 180 degrees F, which is the temp where the engine thermostat opens. The next most likely place for a leak is at the engine radiator due to debris impact or other damage.ģ. Look at the inside of the pump pulley for signs of dried antifreeze which will be pinkish or whitish if the correct Toyota coolant is being used. The most likely place for an engine coolant leak is at the engine coolant pump bearing. If you do not see this, yet the engine coolant level drops so much, then it is guaranteed that a leak exists. When accelerating hard, if you see white smoke, the problem is that engine coolant is leaking through the cylinder head gasket and is being burnt in the combustion chambers.Ģ. Should I shell out the money to replace this valve? Do you think the problem might be elsewhere? I'm interested to hear your opinions!Įdit: Oh, and one final thing worth noting-after only a few minutes, we can still get very good temperatures from the heat in the cabin, which doesn't seem to be the case for many people who have similar issues. I don't know the first thing about car maintenance, so I don't see myself doing any of the repairs myself without causing more problems than I solve. You folks know a lot more about these things than I do, so I wanted to throw it out there and get some opinions. Sure enough, according to the reader, the coolant temperature peaks at around 245 degrees while she's on the interstate. My wife drives the car to work about 15 miles in the morning without trouble (peaking at about 70 mph on the interstate), but on the drive home (after sitting in 95+ degree humid weather all day), it gives her the warning at about the same place on the interstate every time. I got myself a bluetooth OBD reader that connects to my phone (I can't afford a Scangauge), just so that I could see for myself the actual coolant temperature. They also told me that if that was indeed the problem, I probably wouldn't ruin the engine if I just drove on the problem without fixing it, though I'm not entirely confident in that assessment. They quoted me 500 dollars to replace that particular part, but said to hold off, because they couldn't be sure that was the problem. They said the problem may be with a particular sticky valve (they didn't actually tell me which, and unfortunately, but I think they're referring to the coolant control valve), but they couldn't actually get it to stick. Took it back to Toyota, and they couldn't find anything wrong. Once or twice during that week (though not constantly), I heard sloshing from behind the dashboard when starting the car up. After receiving the car back, everything was fine for about a week, and then we started receiving the same high coolant temperature warning. We took it to the service department of the nearest dealership, and they flushed the coolant system, added new coolant (replacing the 3/4 gallons of water we added on our drive home), and presumably bled the air out of the system. We actually managed to make it to our destination, and then another 350 miles home, simply by continuing to add water to the radiator every time we received the warning light (it took about a quarter gallon every time before filling to the top).īy the time we got home, we also had a CEL for code P1150. They couldn't see any problems, added some water to the radiator, and sent us on our way. We pulled it over to the nearest mechanic, who took a quick look at it just to see if they could find any leaks. A few weeks ago, after driving a few hundred miles on a road trip, my wife and I received the red triangle warning light, along with a high coolant temperature warning.
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