![]() ![]() ![]() When you flush your coolant, which is antifreeze, on your 2004, you are draining out all of the old dirty coolant and preventing costly radiator and cooling system repair down the road. Like the oil in your Jetta, coolant gets dirty over time and loses its ability to cool down your 2.0 liter engine. Turn off the engine and drain the water, fill up the radiator with antifreeze until you have a 50/50 coolant / distilled water mixture and burp the system. Fill up the radiator with distilled water and run the engine. This video shows where the radiator drain plug (petcock) is located on a 2004 Volkswagen Jetta. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. In addition to preventing your car from overheating, coolant / antifreeze also helps lubricate the seals in the water pump and hoses. Coolant / antifreeze also passes through the heater core under your cowl to provide heat to the cabin of your Jetta. Coolant / antifreeze circulates through Jetta radiator and engine to maintain the proper temperature. If so, the car’s safe to be back on the road.Learn how to flush the coolant (antifreeze) in your 2004 Volkswagen Jetta. Check if the temperature gauge is reading fine.Tighten the radiator cap and add the coolant back or replace it if it’s old.Replace the hose if it’s leaking or worn out. Clean and reassemble the radiator hose, hose clamp, and thermostat housing.Remove the old thermostat and install the new thermostat.Test the new thermostat by placing it in a bucket of boiling water.Ensure the new thermostat and gasket are similar to that of the old thermostat. Remove the radiator hose with the hose clamp and take apart the thermostat housing and gasket.Find the thermostat by locating the radiator hose.Drain enough to bring the coolant level below the thermostat housing. Drain the engine coolant (antifreeze) through the radiator cap.Ensure the vehicle has cooled down to prevent burns.Here’s a general guideline on how a mechanic would perform a thermostat replacement: So, it’s best to leave the replacement to a professional mechanic rather than attempt a DIY repair. Thermostat replacement requires a fair bit of knowledge and experience to ensure that the components and the cooling system work efficiently. This can include a radiator hose replacement, water heater installation, or air conditioner repair (AC repair). Īs a safety measure, you could replace your existing thermostat when your vehicle’s cooling system components are serviced. So, most mechanics recommend a thermostat replacement after 10 years. Here are the different types available for your car:Ī car thermostat does eventually wear down and fail. Vehicle thermostats may be either mechanical or digital. What Are The Different Types of Thermostats? This keeps the engine at an optimal temperature (between 195☏ to 225☏), preventing overheating. When the engine hits a certain temperature (usually around 195☏), the valve opens, allowing the radiator to cool the liquid coolant. This, in turn, promotes efficient fuel use and reduces engine deposits. ![]() It traps the engine heat, helping it quickly heat up to the right temperature. ![]() When you start your car, the thermostat valve is closed, preventing the coolant flow from reaching the radiator and cooling the engine. It’s an important part of your vehicle’s cooling or heating system or HVAC system, helping regulate the temperature setting of the vehicle. The thermostat helps keep your engine running at the right temperature. Here are quick answers to four questions about thermostats and their replacement: 1. ![]()
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