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Cooling System

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Symptoms of a Bad or Failing EGR Cooler
Common signs include engine overheating, exhaust leaking, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Radiator Hose
Common signs include leaking coolant, engine overheating, the Low Coolant Light coming on, and radiator hose damage or collapse.
Symptoms of a Bad or Failing Radiator
Common signs include leaking coolant, vehicle overheating, sludge, and low coolant.
How To Keep Your Car From Overheating
Monitoring your coolant level, turning the A/C off in very hot weather, and regular inspections will help you avoid having an overheating car.
How to Quickly Cool Down a Hot Car
Knowing how to cool off a hot car that has been sitting in the heat and sun can save you the discomfort of having to sit in...
How Long Does a Cooling Fan Relay Last?
The purpose of the cooling fan relay is to pull air through the A/C condenser and the radiator. Most vehicles have two fans, one for the radiator and one for the...
How Long Does a Cooling Fan Resistor Last?
The purpose of the cooling fan resistor is to remove heat from the engine’s coolant and from the A/C refrigerant. The resistor does this by drawing air through the radiator and...
Symptoms of a Bad or Failing Water Pump (Auxiliary)
Common signs include no warm air or fluctuating heat coming from the heater, the window defroster not working, and high pitched buzzing sounds.
How Long Does a Coolant Reservoir Last?
The coolant reservoir is a tank located in your vehicle that holds the overflowing coolant that comes from your cooling system. The reservoir is a clear plastic container located near the radiator....
How Long Does a Connector Hose Heater Control Valve Last?
The hose heater control valve opens and allows hot coolant from the engine to blow into the heater core. After the vehicle gets to the correct temperature, the thermostat...
How Long Does a Coolant Recovery Reservoir Last?
The coolant recovery reservoir is both an expansion tank as well as a coolant recovery tank. In modern vehicles, the radiator has no cap so it has no upper tank for...
How Long Does a Coolant Tube Last?
The coolant tube, or hose, carries coolant to and from the engine in your vehicle. First, the coolant tube removes the hot coolant from the engine and brings it to the radiator...
Symptoms of a Bad or Failing Water Pump
Common signs include coolant leaks at the front-center of the car, loose water pump pulley, overheating engine, and steam coming from the radiator.
How to Replace a Cooling Fan Resistor
The cooling fan may not work at all speeds if the resistor is broken. If the engine overheats or the fan never turns off, the resistor may be faulty.
How Do I Prepare My Car for Summer?
Summer's heat, dust, and stop-and-go traffic will take their tolls on your vehicle. Follow these tips to ensure optimum wellness of your car: Air Conditioning: Have your air...
How to Flush Your Cooling System
Flushing the cooling system is part of every vehicle's scheduled maintenance. This procedure is usually required every two to four years, depending on the vehicle. It is important...
How to Calculate the Concentration of Coolant in a Car
A vehicle's cooling system helps transfer heat away from the engine, allowing the vehicle to function at a normal operating temperature. Without the coolant system, your vehicle would soon...
Why Cooling System Repairs on a European Car Can Be Tricky
Repairing a cooling system, such as if there is a leak, can pose different obstacles. Many repairs may involve finding the radiator of the system.
How to Replace a Cooling Fan Relay on Most Vehicles
Cooling fan relays fail when the radiator cooling fan no longer receives an electrical signal. A broken fan relay means the radiator cannot cool down.
How to Remove and Replace a Heater Control Valve
The heater valve is integral to a vehicle’s cooling system. Replacing one requires a new valve, some basic tools, and fresh coolant.

Related questions

Where is the cooling fan relay located?
For the Kia Soul, the low and high fan relays are located in the engine compartment fuse relay panel box. There is also a 30 amp fuse in the same location that powers both relays. The 2008 Hyundai Elantra cooling...
Car is still overheating - 2006 Acura TL
There is no bleed screw on the 2nd generation TLs. Bleed the cooling system with the nose of the car higher than the rear if possible let it heat up at an idle until the thermostat opens and allow all...
Where is the coolant leak coming from?
For an issue like this, you would need to do a cooling system and pressure test so the actual leak can be found. Once the test is done by a mechanic then you would get a quote for the exact...
Truck starts to overheat and blows cool from the heater but fixes itself after hitting a bump.
The overheating may also be caused by other issues such as a bad heater core. This is a small radiator used to warm up the interior of the vehicle making the heater operational. A valve controls the flow of hot...
Car gets hot sometimes. I unplugged the temperature sensor, turned on my air, and switched relays, and my radiator fans still don't work
Hey there. You should have the cooling fans checked to see if the cooling fans are getting power from the control system. The overheating diagnosis may show the system fan relays are not being turned on by the computer. Only...
Can a gasket leak from the intake leak air into the cooling system?
Hi there. An intake gasket leak would allow unmeasured air into the intake and create a lean condition, not an overheating issue. Base on what you've described, it sounds like you may have a leaking cylinder head gasket. Adding sealants...
My heater blows a lot of air it just doesn't get very hot
Hello there, a few common faults will cause your vehicle to have air that is not very hot. Without knowing the year, make and model of the vehicle I can only provide a broad answer. The most likely faults are...
The HVAC is not cooling the air in the car. Fan works, but no cooling. Can this be fixed by YourMechanic?
This can happen for a number of reasons such as being low on Freon, a faulty AC thermostat switch or a failing AC compressor. We do currently offer services for repairs/inspections of air conditioning systems.
How do I know if my water pump has went out?
Hello, a coolant pump can fail three different ways: leaking, noise, or low to no flow of coolant. Leaking would be associated with a loss of coolant and needing to add coolant back into the system. This could also be...
My car overheats and loses water quickly. What should I do?
Your car may have a leaking water pump. Try to keep the coolant level full until you can get the cooling system pressure tested to see where the leak is and get the leak repaired. If the engine is...
When should I get my coolant flushed?
Most auto manufacturers and coolant manufacturers recommend flushing and replacing the coolant once every two years. This is more a reflection of the number of "heating the engine and cooling it back down" cycles occurring in your vehicle than mileage....
Tools to replace a radiator and fan
Hey there. You will need mostly basic hand tools - a ratchet, sockets, wrenches, pliers, screw drivers. The only problem you might run into is bleeding the cooling system of air after performing the replacement. Since this radiator does not...
How do I fix this issue on my 1993 Subaru Impreza?
Hi there. If the engine overheated, then it is more than likely that a head gasket is leaking now. This engine has weak head gaskets, so if it gets hot at all, these will fail. I usually pressure test the...
Check Engine Light is on - 2003 Honda Accord
Hello. If the issues appeared when using the AC and defroster, then they are likely related to that system. In most cases, the AC / Heater does not use vacuum lines as a part of it's operation, so a vacuum...
The driver's side block is getting hotter than the other side
Hi and thank you for contacting YourMechanic. Most likely what is happening here is that the water jacket in your engine on the right side is obstructed and not allowing sufficient coolant to circulate causing the left side to become...
Electric cooling fan problem after repairing my water pump and thermostat
The water pump and thermostat was replaced for what I can only assume was a leaking water pump. Once this work was done then the mechanic should have run the vehicle until the thermostat opens to completely fill the cooling...
A/C will not put out cold air.
Hi and thank you for contacting YourMechanic. These AC system are very sensitive and if the pressure isn't tested with the correct gauge and gives and incorrect reading, this will affect how well the system works. I highly recommend that...
Coolant fan runs continuously? What can it be?
Hello. Most of the time on this vehicle the issue is caused by a failure in the fan control module. It typically has an internal short that causes this. I usually test the circuit to make sure that the computer...
The high temperature cooling fan keeps coming on when the car is in park or driving. The temp rises until I start driving then it decreases.
This could reflect a circumstance where the radiator has slowly developed a partial blockage over time due to sediment and corrosion. Other possibilities include a defective radiator cap and partially collapsed radiator hose (typically lower). It is possible for a...
replaced the engine temp sensor and now the cooling fans wont turn on
Hello there, a few common faults will cause your cooling fans to not work after the temperature sensor was replaced on your 2003 Subaru Impreza. If the problems started right after the repair was made the replacement coolant temperature sensor...

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