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Cooling System

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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.
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 car cooling system works to transfer heat from the engine. Check antifreeze level and condition, and mix coolant with water to prevent overheating.
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.
How to Replace a Car Air Conditioning (AC) Compressor
If the AC compressor fails, it can cause the air conditioning system not to work. This article covers how to locate, remove, and install a compressor.
How to Replace a Condenser Fan Relay
A condenser fan relay operates the fan that removes heat from the engine. If faulty, it will not allow the A/C to blow cool air or function at all.

Related questions

Question
Looking at a private seller's 97 Kia Sportage. Seller states there is a leak in the thermostat housing gasket. Is this a major iss
I would not purchase a vehicle with a coolant leak without first having the vehicle inspected by a mechanic before I purchased it. You may have an engine that has been overheated and continues to overheat. It may already have...
Question
Overheat leaking antifreeze
Anytime you have a leak you notice as soon as you try and pour in any coolant then this is considered a major coolant leak and should not be driven until the leak is repaired. The coolant system water pump...
Question
Upper radiator hose keeps building up a lot of pressure and popping off. Car loses coolant and over heats.
Hello, thank you for writing in. The radiator hoses can pop off for several reasons. Typically it is because the hose or the plastic neck that connects it to the radiator/component has failed. You will want to inspect both sides...
Question
Do i need to reset my vehicle after replacing my coolant sensor
If you have a check engine light that is still on then you may need to have the computer scanned to make sure that there was no other codes or damaged from the overheating situation you had. You may need...
Question
replace radiator hose
If you have sensors in the upper and lower hoses then I suggest checking to make sure you can remove them and cut the new hose? Otherwise you will need to get factory hose with sensors installed in them. The...
Question
2004 infiniti overheating. Can the water pump be bad even if its not leaking. Changed every thing else.
In the old days, if the water pump was turning, it was working. But many modern cars have plastic impellers in the water pump and they can lose their grip on the shaft when they get old. It's hard to...
Question
Is a coolant leak a byproduct of redlining a car for an extended amount of time?
Wow! You'd better check the oil too! Driving the car this way is about the same as taking it out on the racetrack for about an hour. The racetrack always brings out any weakness that a car has so If...
Question
Excessive use of coolant
Hello, and thank you for writing in. Without any signs of exterior coolant leaks, the leak will likely be interior. Most commonly this is a result of a failed head gasket. It will allow the coolant into the combustion chamber,...
Question
Gurgling sound from dash. No over heating. Runs great. Just concerned about why the sound is made.
The gurgling noise is most likely caused by a heater core that is partly clogged. You can try to have the cooling system flushed and the heater core flushed also to see if the noise goes away. If not then...
Question
Hi I am changing the top Radiator Hose to my mothers 94 Oldsmobile.. I see 2 clamps and the shorter hose.. That's what I bought an
Hello, and thank you for writing in. Bleeding the cooling system is a process of removing the air from the system by allowing the thermostat to open and flush any air out. There is a bleeder screw located next to...
Question
What would cause the temperature gauge in a 1993 geo prism to work fine when idling but when driving it drops to cold ?
Assuming that the temperature gauge and sending unit are in good shape, what may be happening is the engine cooling thermostat may be sticking in the open position causing engine temperature to fall below normal once you are at speed....
Question
My ford contour 2.5 litre v6 1998 model is losing coolant, When the engine is hot steam rises from the right hand front of the en
Hello, thank you for writing in. While the head gasket is a common place for older vehicles to leak coolant, there are some places you will want to check first. For example, the water pump which is the heart of...
Question
My 1998 Buick Park Avenue only runs hot when in traffic or just idling. What's the cause of it running hot?
Either the cooling fans on the radiator are not working properly or the radiator is plugged up to where there is a restriction when the engine's water pump is running at a slow speed. If you suspect that the radiator...
Question
Heat turns cold after I drive for awhile. Got the water pump changed and the thermostat. Still having issues
If the cooling system gets low at all, usually the first thing you notice is that the heat goes away. The system could seem to be full, but have air pockets causing your problem. That can be solved by bleeding...
Question
coolant leak yesterday, shop tested today with 15lbs press no leak, no repair made, after leaving shop lukewarm heat. whats up?
A special dye can be added to the cooling system to detect the leak point. The dye is visible with a UV light source. Common causes of no, or inadequate, cabin heat include malfunctioning blend door(s) (part of the in-dash...
Question
Hi, I have a 2003 pontiac sunfire that is getting water in my engine. It looks like water is leaking from somewhere between my eng
Engine coolant can leak externally through a hose, radiator, water pump, etc. or internally due to a leaking head gasket and sometimes a leaking intake manifold gasket depending on the engine design. External leaks are typically found by simple pressure...
Question
Why is my 2009 Ford Taurus still running hot after I put new water pump, new thermostat on and flush radiator twice but it still runs hot.
You may still have air pockets in the cooling system. If you do not bleed out the air it will still overheat. After bleeding all the air out of the engine and heater core then see if it still overheats....
Question
My car overheats
Hello, thank you for writing in. The cooling system does not always rely on the overflow reservoir that you can see into. Most of the coolant is stored in the radiator when it is off. This is also known as...
Question
2006 Xterra 4x4, 4.0L V6. Engine is overheating. No coolant leaks. Replaced thermostat. Flushed radiator. Fans work. What to do?
Hello, thank you for writing in. Overheating issues are very frustrating. When in this situation, you will want to go ahead and test the radiator cap and make sure it is regulating pressure correctly. Secondly, the water pump needs to...
Question
Hi man.. I own a 2007 VW Passat 2.0, I got check engine light showing code p2181 cooling system error. Should I change only the th
Hello. A P2181 cooling system code is really generic, and all it means is that the cooling system is too hot or too cold. Unfortunately that does not give you much to work with. Check the level of your coolant,...

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