Home » Cooling Perfomance » What Could Happen With Thermostat Stuck Open What Could Happen With Thermostat Stuck Open My thermostat in my radiator hanging wide open, and my car never gets very hot. Could any problems arise from this? Tags:Could, Happen, Open, Stuck, Thermostat Related Questions How Do You Change A Thermostat I’ve got a 1990 Pontiac Sunbird. How do I change the thermostat? Do I need to flush the system? Restore or buy a new car I am wondering what would be a better car and investment. I was debating whether to buy a brand new 350z convertable and put twin turbo’s on it or Answers for The Question man_with_koolaid_smile yes the car will run rich and burn too much fuel Ron B Yes, decreased fuel mileage from an overrich fuel mixture because the computer uses the ECT reading to control fuel mixture. Cold engines require more fuel to run properly. duce Your engine will never reach or take a very long time to reach proper operating temperature, this may be ok when it’s hot out but in the winter you will get lousy fuel economy and the car won’t run well, have it changed skwonripken You’ll only have problems in very cold weather. The engine will not get to proper operating temperature for a long time, the heater will not work well and you’ll freeze your fanny off. Nothing will be damaged, but why not change it? It is a very simple repair that costs very little. 3DDD Fuel mileage would be the biggest problem and that might not be that bad. most69s your car wont store heat and the heat would not be warm but good thing its not stuck shut u would over heat u got any more questions Mike Fuel has nothing to do with it, Everybody is making it sound complicated. With your thermostat stuck open you are going to have lousy heat in the cold weather. They cost about $7 at your nearest AutoZone or Oreillys and is very simple to replace. Make sure you purchase the gasket if it doesn’t come supplied with one. BitburgerPilsMan The above answerer is correct about heat, but he knows nothing about the way newer electronically controlled engines work if he thinks gas use isn’t an issue. jcann17_2002 I pretty much agree with all of the other answers. But don’t forget that a stuck thermostat can lead to major problems down the road that a simple fix can and will solve right now. Incoming search terms: Car Thermostat Stuck Open,Thermostat Stuck Open In Car,What Happens When The Thermostat Gets Stuck,Why Would The Thermostat Be Stuck Open,What Happens When You Car Thermostat Fails,What Happens When Truck Thermostat Stays Open,What Happens When Thermostats Remain Open,What Happens When Thermostat Sticks,What Happens When The Thermostat Stuck Open,What Happens When The Engine Thermostat Fails?