Engine Overheating & Auto Cooling System Repair & Service

Auto Service Experts Engine Cooling System Specialists in San Antonio, TX

Auto cooling system problems (such as a radiator leak, coolant leak, or car overheating) can not only leave you stranded on the side of the road, but they are also a common cause of poor engine performance and even engine failure. The cooling system is responsible for helping the engine to quickly reach, then maintain ideal operating temperature. Running above or below the proper operating temperature causes the engine to run less smoothly & efficiently, waste fuel, and create more pollution. The radiator, water pump, coolant, and thermostat work together to remove heat from the engine in order to prevent the vehicle from overheating. Overheating can cause major damage (such as cracked cylinder heads) which may require auto engine repairs or motor rebuilds. These components also work with the HVAC (heating, ventilation, & Air Conditioning) System to heat or cool cabin air allowing for increased passenger comfort. Have an Auto Service Experts ASE certified mechanic service and inspect your auto cooling system yearly to avoid major auto repairs such as a blown head gasket. 


Contact Auto Service Experts auto repair shop to schedule your annual auto cooling system service today before the San Antonio summer heat arrives!


Engine Overheating Repair on Auto Cooling System

Blown Head Gasket Repair due to Engine Overheating

Auto Service Experts Auto Cooling System Inspection Includes:

• Belts - inspect for corrosion and signs of cracking
• Coolant - ensure that it is uncontaminated and provides adequate protection against overheating.
• Cooling Fan - test performance
• Fan Clutches - (if applicable)
• Radiator Cap - pressure test 

Check for Cooling System leaks at: 

• Radiator
• Engine Heads
• Freeze Plugs
• Heater Core
• Hoses
• Intake Manifold
• Reservoir Tank
• Thermostat Housing
• Water Pump


Auto Cooling System Components:

Freeze Plugs - keep coolant from leaking out of engine (these may expand or rust without proper cooling system maintenance)
Heater Core - draws hot coolant from the water pump to heat the vehicle's interior, then returns coolant to the engine
Hoses - the "plumbing" which connects system components and transfers coolant through cooling system
Head Gaskets - seal the engine block to the cylinder heads, preventing liquids or gasses from escaping
Pressure Cap - maintains pressure within the cooling system
Radiator - lowers temperature of coolant
Radiator Fan - maintains air flow through radiator when vehicle is stopped or running slowly
Reservoir Tank - captures coolant released by pressure cap
Thermostat - regulates flow of coolant to reach and maintain optimum engine operating temperature
Transmission Cooler
Water Pump - circulates coolant


Automotive Cooling System Inspection San Antonio TX 78216

How Auto Cooling System Components Operate

Radiator - The coolant is heated as it flows through the engine. Hot coolant is drawn in through the top inlet of the radiator through a rubber hose (upper radiator hose). Many radiators consist of aluminum tubes with fins which zigzag across them. Coolant travels down these tubes as the cooling fans push hot air from the radiator out and away from the vehicle. Once the coolant has been cooled back down, it is released through an outlet to return to the engine. Have a bad radiator replaced immediately to avoid overheating and costly engine damage.


Coolant - Coolant expands as it heats, this increases pressure within the cooling system. Because of its high concentration of ethylene glycol, coolant boils at a higher temperature than water. When pressurized, coolant can reach temperatures of 250 degrees and higher before boiling.


Pressure Cap - The pressure cap is designed to regulate the pressure within the cooling system. It equalizes pressure and maintains it at a constant level, which keeps the coolant boiling point consistent. A special spring loaded valve releases excess pressure when it exceeds the preset pressure level. When this happens, some of the coolant drains out into a reservoir tank (coolant recovery tank), forming a partial vacuum in the cooling system. A secondary valve on the radiator cap allows this vacuum to pull coolant back out of the reservoir tank and into the radiator once it is cool.


Water Pump - The water pump circulates coolant through the auto cooling system. When the engine is running, the water pump is either gear operated, or powered by one of the following; the timing belt, the fan belt or the serpentine belt. A failing or leaking water pump requires replacement right away to avoid major engine damage from overheating.


Thermostat - The thermostat monitors coolant temperature. When the coolant reaches high temperatures, a valve opens letting the hot coolant pass into the radiator to be cooled. If it does not reach high enough temperatures, the valve remains closed. The coolant instead returns to the engine and helps to heat the engine. Thermostats fail over time and prevent the cooling system from operating as it needs to. Thermostat replacements are minor repairs which prevent major engine overheating damage, so always have it checked at the first sign of a problem.


*** If your vehicle is in need of a water pump replacement or thermostat replacement you may also notice heating system problems. See our article on heater repair to learn how the cooling and heating systems are related.  


The Heater Core - The heater core is attached to the cooling system by two hoses. Hot coolant enters the heater core through one of the hoses and flows back into the engine through another hose. The blower is a fan which pulls air through the heater core into heater ducts and ultimately, into your vehicle to warm cabin air.


Blend Door - A blend door controls the temperature by allowing this hot air to mix with cold air from your auto AC system or outside. This lets you adjust the inside cabin air temperature making it hotter or colder to your preference.

Cooling System Repair Avoids Engine Overheating

How your vehicle's radiator, thermostat, coolant, heater core, and engine work together, and why cooling system service can prevent engine repair down the road. 

Auto AC Repair

AC Repair on 04 Lamborghini Gallardo


Get your ride ready for the summer (and occasional mid-winter) heat! Auto Service Experts offers FREE AC checks by San Antonio HVAC specialists! Our mechanics are professionally certified in automotive air conditioning system repair & service, and are Experts in Diagnostics - We Save You Time & Money!

ASE master technician Carlos Rodriguez

(210) 495-6688
Auto Service Experts

13050 San Pedro Ave. San Antonio, TX 78216

Mon-Fri 8:00am - 6:00pm