The post Thermostat Problems: Will Affect Your Engine’s Performance appeared first on Danny's Engineportal.

Did you know that your car can overheat even during winter when it’s cold outside? Nothing ruins an already trying day more than having your car’s engine overheat. If your vehicle’s cooling system is leaking coolant or you think there’s an issue with your auto radiator, keep reading for valuable information about common symptoms for your overheating engine.

Auto Cooling System Components

Auto Radiator

The auto radiator is an aluminum tank located just behind the front grill of your car. Inside the radiator, there are rows of narrow tubes filled with coolant, exposing a large surface area. This helps the heat dissipate quickly via the metal fins and the air flowing through the vehicle’s grille. If insufficient airflow comes through the grille (e.g., if the car is idling or stopped in traffic), a fan behind the radiator increases the airflow.

Engine Coolant

Engine coolant is a mix of distilled water and antifreeze in your radiator. The formula prevents it from freezing and contains chemical additives to absorb heat, reduce corrosion, and prevent scale buildup. The coolant moves continuously, pushed through the cooling system by the water pump. The engine has internal hollow structures called water jackets. The coolant flows inside the engine through these, absorbing the engine’s heat. It then travels through hoses to the radiator, where it cools down. From there, it’s back into the engine to repeat the process.

Radiator Pressure Cap

The radiator pressure cap is a neat device that maintains pressure in the cooling system until a certain point. Once the pressure is higher than the set pressure point, a spring-loaded valve, calibrated to the correct pounds per square inch (psi), releases the pressure.

Radiator Fans

These components are usually mounted on the back of the radiator, close to the engine. Either one or two electric fans reside inside a protective housing designed to safeguard fingers and direct airflow. These fans keep the airflow moving through the radiator when the vehicle slows down or stops while the engine is still running. If these fans stop working, the engine temperature will rise every time your car stops moving.

Water Pump

A water pump keeps the coolant moving as long as the engine runs. It is usually mounted on the front side of the engine and only functions while the engine is running. The water pump consists of a housing, usually cast iron or aluminum, and an impeller mounted on a spinning shaft. A pulley is attached to the shaft outside the pump body. The engine operates the water pump through one of three types of belts:

• • Fan Belt: This also operates additional components such as an alternator or the power steering pump.
  • Serpentine Belt: This may also provide power to the air conditioning compressor, alternator, and the power steering pump.
  • Timing Belt: This may also power one or more camshafts.

Thermostat

The thermostat is a valve that calculates the temperature of the engine coolant. It opens once it is hot enough, allowing the coolant to move through the radiator. When the coolant is not hot enough, the flow to the radiator is closed, so it enters the bypass system and returns to the engine. The bypass system helps keep the coolant moving through the engine to equalize the temperature.

Coolant Reservoir

A coolant reservoir stores the cooling system’s excess coolant. As the coolant temperature increases, it expands and overflows into the reservoir. It is directed back into the radiator as the engine cools down after shut-off.  

Hoses, Belts, Seals and Gaskets

Various rubber hoses, belts, seals, and gaskets keep the cooling system pressurized and prevent leaking gases, fluids, and air from spreading into surrounding components where they do not belong.

• • Hoses: Several rubber hoses connect the various components within the cooling system. These hoses withstand vast pressure, so they are subject to wear and tear. Eventually, they may require replacement as part of routine maintenance. If any hoses look dry and cracked or become soft and spongy, it is time to replace them.
  • Belts: The engine belts are under constant strain while driving and can wear out over time. Be sure to look for fraying, cracked, or worn belts and replace them when necessary. 
  • Head Gasket: The head gasket is a seal between the cylinder’s head and the engine block. Your engine uses the force of fuel combustion to power the piston. The gasket contains the combustion so your engine can direct its power more efficiently. It also acts as a barrier, preventing the fuel, oil, and coolant from mixing together.
  • Manifold Gasket: This automotive part prevents the heat generated by the engine block from seeping into the air intake manifold. Fuel ignites best with cool air, which is denser and generally contains more oxygen. The engine’s strength and power usually determine the manifold gasket’s thickness. 

Common Faulty Cooling System Symptoms

Below are a few common symptoms of a faulty cooling system. If you experience any of these symptoms, schedule a diagnostic service with your local auto shop to prevent an expensive engine rebuild or replacement.

Overheating Engine

When a vehicle’s thermostat remains closed, the hot coolant cannot flow to the radiator. If the hot fluid cannot cool down, the engine’s temperature stays higher than optimal, causing an overheating engine. Coolant must run through the radiator to cool down. Once this occurs, it returns to the engine and dissipates more heat. However, when the coolant remains stagnant with a stuck thermostat, more heat builds up, triggering the thermostat warning light.

Thermostat Warning Light

When your car’s coolant temperature warning light illuminates, it may indicate one of several common causes requiring immediate attention. Potential issues include:

• • Low engine coolant level: Insufficient coolant in the system can lead to engine overheating and trigger the warning light.

• • A malfunctioning thermostat: If it does not open or close properly, the engine’s temperature regulation is erratic.

Low or Leaking Coolant

Leaking coolant is particularly troublesome because it can lead to various severe problems, including overheating and internal engine damage. Inspect the coolant reservoir, hose connections, and radiator for leakage. One of the most obvious signs of leaking coolant is puddles under your vehicle. Unlike engine oil and most other fluids, coolant comes in various colors (neon green, red, orange, purple, etc.) and often smells sweet. Clean up spills to avoid poisoning pets, wildlife, and children who may be drawn to the attractive smell.

White Exhaust

When coolant seeps into your engine’s combustion chamber due to a faulty head gasket, it produces steam (water vapor and glycol) in your exhaust. Schedule a diagnostic service as soon as you notice white smoke or steam from your exhaust pipe or engine compartment.

Cooling System: Maintenance, Service & Repairs

Ron’s Garage specializes in routine maintenance, auto service and repairs on all vehicle makes and models in Ann Arbor, MI. Stop by our shop for all your cooling system needs, including leaking coolant, a damaged auto radiator, or to diagnose your overheating engine.

Schedule Cooling System Service in Ann Arbor, MI

Contact us at (734) 961-4701 or visit our website to make an appointment. We look forward to seeing you soon!

The post Auto Radiator and Cooling System: Symptoms & Repairs first appeared on Ron’s Garage | Auto Repair Ann Arbor MI | Brake Repair.

Summer is coming to a close. Before you know it, the weather will turn crisp and wet, heralding the return of pumpkin spice season. While I’m looking forward to cooler temperatures, I dread the idea of sitting in a chilly car waiting for my car heater to kick in. Did you know that scheduling routine auto maintenance can actually improve the performance of your car heater? Yep, it’s true. Your HVAC system (especially the heater core) relies on fresh engine coolant to operate the car heater effectively.

Cooling System Basics

A combustion engine generates an enormous amount of heat. If the engine isn’t cooled sufficiently, it can sustain serious damage. The majority of newer vehicles utilize liquid-cooled engines. They use engine coolant (water + antifreeze) to limit corrosion and maintain appropriate engine temperatures. The coolant moves through the engine and other cooling system components, absorbing heat. It eventually enters the radiator, where the super hot liquid cools down. This process repeats in a continuous cycle while the engine is running.

How Does My Car Heater Work?

For your car heater to provide warmed air into the cabin, some of the hot coolant diverts into the heater core. The heater core is a mini radiator in the HVAC system that circulates the hot coolant from the engine cooling system. When you turn on your car heater, the blower motor moves the warmed air across the heater core, through small ‘blend-doors’ and into the cabin.  

Blend-Doors

Cars with automatic climate control use sensors to monitor the cabin temperature and humidity. The sensors control when the blend-doors and outside air flaps open and close, maintaining the desired temperature inside the car. 

Dual-zone climate controls allow the driver and passengers to set different temperatures. These HVAC systems independently operate blend-doors on both sides of the dash (plus front and rear seating) based on the selected temperatures in each section of the car.

Car Heater & HVAC System Maintenance

Your car’s heater relies on a properly operating cooling system. Let’s review which components play the biggest role in maintaining this goal.

Engine Coolant

Old and dirty coolant can prevent the cooling system from operating correctly. Without adequate levels of clean coolant, the HVAC system may stop working. Simple auto maintenance, like a coolant fill or coolant flush, can help a struggling cooling and HVAC system.

Cooling System Thermostat

The thermostat in your vehicle’s cooling system mounts between the engine and the radiator. It works as a valve, opening and closing at specific temperatures, controlling the coolant flow. A faulty thermostat may cause your engine to run too hot or too cold. Temperature fluctuations in the engine are inefficient and may decrease fuel economy. Regular auto maintenance can spot a bad thermostat before it causes engine damage.

HVAC Heater Core

Your vehicle’s heater core transfers the heat from the hot coolant into the interior cabin. The heater core contains small channels or tubes, so it gets clogged with rust, scale, and particulates when the coolant is old or dirty. Even low coolant levels (resulting from a coolant leak) may create issues with your heater core. The heater core may have cracked if you smell a sweet aroma inside your car. Check near the floor mats for leaking coolant. In most cases, damaged or clogged heater cores are irreparable and require replacement.

Blower Motor & Fans

The blower motor controls the fan settings of your climate-control HVAC system. When you turn the dial in the dashboard for the heat or AC, the blower motor adjusts the air volume accordingly via a mechanical switch or electronic module. A broken blower motor will deliver weak airflow or even none at all. A service technician can track down if the airflow issues are due to a worn blower motor or another faulty component.

Blend-Doors, Actuators, Sensors

The HVAC system blend-door determines where the airflow comes from. Most newer climate control HVAC systems use an electric motor to control the blend-door’s position. When you change the climate control system temperature, the blend-door actuator moves to the appropriate position. The blend-door actuator may contain an electronic sensor that continuously monitors the door’s position.

Auto Maintenance in Ann Arbor, MI

While it may not feel like it right now, fall is right around the corner. Driving your vehicle in the chilly weather of Ann Arbor, MI, without a functioning heater can be miserable. At Ron’s Garage, you can trust our team of experienced service technicians to perform a detailed inspection of your car’s cooling system and HVAC. We can determine the condition of the heater core, coolant, and other car heater components. We will then recommend the necessary auto maintenance or repairs to get you back on the road. 

Schedule Your Car Heater Repairs

Call (734) 961-4701 or visit us online to schedule your car heater repairs today.

The post Your Car Heater: Why Is It Time For Fall Auto Maintenance? first appeared on Ron’s Garage | Auto Repair Ann Arbor MI | Brake Repair.

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