I own a 2004 Land rover Discovery SE7 the heat works when \i drive it however when it is \idle the air blows cold I noticed my coo
I own a 2004 Land rover Discovery SE7 the heat works when \i drive it however when it is \idle the air blows cold I noticed my coolant was low so I topped it up. But it still blows cold on idle.
My car has 185 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hello. Thank you for writing in. The heating system depends heavily on the function of the cooling system. What is likely happening is a lack of coolant circulation when the car is idling. This is causing the coolant to sit stagnant and the heater has no supply of hot coolant coming into the heater core in order to heat the air coming in. It may be due to the water pump, which is tied into the drive belts. When the engine is running at a higher RPM the water pump may be functioning, and when the engine idles, there may not be enough power to work the pump. The pump is responsible for the flow of coolant, and is also a common place for leaks. Find the source of the leak, and test the pressure coming from the water pump.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
The most common reasons a Land Rover Discovery heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
The 3,948 cc V8 petrol version from the Discovery 1 was replaced with the Range Rover P38 Thor 4.0-litre, Rover-derived V8. There was no actual increase in capacity over the previous 3.9-litre engine.
The 2004 Land Rover Discovery II came standard with a 217-hp 4.6-liter V-8 and four-speed automatic transmission.
The most common reason for heat pumps refusing to go into heating mode is because of a faulty reversing valve. This is a valve that`s located along the refrigerant line, and it`s responsible for changing the direction of the way the refrigerant flows.
In some cases, a fuse might have blown which means your central heating will not work until you replace it. If the switches and fuse are in order, you could have a loose wire. This will require an electrician to fix. If none of the above are the problem, check your boiler to see if the pilot light is on.
The Rover V8 is one of those engines that keeps on going even when it`s in dire need of repair. It`s often neglected, sometimes derided, but in general it is solidly reliable if maintained properly.
Land Rovers have an average lifespan of 200,000 miles or 13 years when kept to a routine car maintenance schedule.
The Discovery has more than 520 miles of driving range on a single tank of gas.
If the heating system isn`t working at all (no hot or cold air is being blown into the car), this is likely due to a faulty blower motor or an issue stopping power from reaching the blower motor, but that`s not the only possible reason. In general, car heater issues can be caused by the following: Low antifreeze.
The 2004 Land Rover Discovery Series II 2.5 Td5 top speed is 157 Km/h / 98 mph.
If the heating system isn`t working at all (no hot or cold air is being blown into the car), this is likely due to a faulty blower motor or an issue stopping power from reaching the blower motor, but that`s not the only possible reason. In general, car heater issues can be caused by the following: Low antifreeze.
Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
I own a 2004 Land rover Discovery SE7 the heat works when \i drive it however when it is \idle the air blows cold I noticed my coo
ANSWER : Hello. Thank you for writing in. The heating system depends heavily on the function of the cooling system. What is likely happening is a lack of coolant circulation when the car is idling. This is causing the coolant to sit stagnant and the heater has no supply of hot coolant coming into the heater core in order to heat the air coming in. It may be due to the water pump, which is tied into the drive belts. When the engine is running at a higher RPM the water pump may be functioning, and when the engine idles, there may not be enough power to work the pump. The pump is responsible for the flow of coolant, and is also a common place for leaks. Find the source of the leak, and test the pressure coming from the water pump.
Air conditioning blowing mildly cold air on the coldest setting, turned off/on again, now blowing cold air, should it be checked?
ANSWER : If you are getting ready for a long trip and suspect the cooling fan may be not coming on for the radiator and a/c then you should have the a/c and cooling system performanced checked before trip. Nothing worse than breaking down when out of town in a strange area.
While driving defroster set to hot blows hot air as it should, while idling it is blowing cold air.
ANSWER : First, the coolant level should be checked to make sure the radiator is full. While the overflow tank may be full, the radiator cap must be taken off to check the level inside the radiator. If you find the level is very low, you have a coolant leak that must be fixed. If coolant levels are normal, an engine thermostat or heater control problem may be what you’re experiencing. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at your lack of heat concern to offer a more personal diagnosis.
My heat and air turns on without a problem but does not blow very hard (heat blows harder than air). Rattling noise.
ANSWER : The heater and the air conditioner both use the same blower motor. However, Nissan does have two separate fuses for the same unit. One of them can be blown. There are also resistors in the system that can fail. There are several electrical tests that can be done, but depending on the condition, it may be more practice to change the entire unit. Due to the age of your vehicle, and the Juke’s history of blower motor issues, it’s very likely a simple fuse issue. These can (for the most part) be visually inspected, and are cheap.
A/C and heat are not working properly. Car blows heat in summer and cool air in winter.
ANSWER : Common causes of no cabin heat include malfunctioning blend door(s) (part of the in-dash ventilation network), a faulty or stuck heater control valve, a plugged heater core, stuck open engine cooling thermostat, collapsed hoses, and low coolant level. The cost to resolve the problem depends on which of the foregoing faults is the cause. If you desire a diagnostic to determine exactly why there is no cabin heat, please request a non functioning cabin heater diagnostic and the responding mechanic will come right to your location and get this resolved for you promptly.
With regard to your air conditioning system, if merely re-charging the system restored normal operation but the a/c ceased to function after a month or so, that scenario typically suggests a leak. Some leaks are really cheap to repair, like if a couple o-rings need to be replaced in system piping but if the leak is at the compressor shaft seal, that repair is more costly. It is not expensive to find the leak and diagnose the system and once the leak is found the mechanic can let you know of the exact cost to repair the leak and re-charge the system. If you desire that service please request an a/c system diagnostic – suspected refrigerant leak and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you
In a 2003 Cadillac CTS at idle position, it does blow hot air but once driving, I only feel cold air coming through the vents.
ANSWER : Hi there. It is possible that you have an obstruction of engine sludge or debris inside the heater core. This typically will cause elevated engine temperature and heaters to not work as well during operation; or specifically – when the heater control valve is opened during operation. It’s also possible that the heater control valve is not working as intended; which might explain the cooler air during engine operation. I would first suggest reading this article which explains some of the common symptoms of a failing heater control valve. If these are common with your issue, it’s probably best to have a professional mobile mechanic come to your location and complete a heater is not working inspection to determine the source of this issue.
My vehicle occasionally heats up and blows cold air out of the heater vents.
ANSWER : If you are getting the heater to work sometimes and other times not then it is due to the engine cooling system has air in it. You should have the cooling system purged of air and then retest system. As long as the engine is full and good flow of coolant through the heater core then you will have heat.
Car will blow cold air but will not blow heat
ANSWER : The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. When the cooling system is not properly circulating coolant through the motor, this results in the warm coolant not being pumped through the heater core properly in order to warm the inside of the vehicle.
Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. As mentioned above, this also restricts the warm coolant from flowing through the heater core which uses this to blow warm air into the cab of the vehicle. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.
