These causes below will show the specific reason why your car have burning rubber smell. By Rick Popely. To diagnose why the air conditioning in your car isn't working, start by turning your car on and setting the AC to full blast. 9 years ago. It does this by absorbing and releasing heat, ultimately leaving cool air behind. In cars powered by an IC engine, the heating system draws heat from the engine's coolant. A sticking valve may mean that that the air is constantly taking the "hot" path through the matrix rather than the cold path. r/MechanicAdvice: This is more than a car repair forum! When the AC clutch engages to run the compressor, it places an additional load on the engine. Did you know it’s part of the cooling system? Read on to see what causes a car heater to blow cold air. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting dial but there is still no air at all to feet and defrost. January 17, 2016. Clogged Radiator. Some modern cars not only take stuff out of the air but also put scent into it. why does my compressor come on and off when the heat is on in my 05 liberty is this normal? World War II proved a major catalyst, because for the first time, military vehicles were able to provide comfort for troops fighting in cold weather. Clutch problem . Hello I am having problems getting my AC/Heat to work in my car. Hold the wire by the insulation and touch the bare end of the Y wire to the R terminal to bypass the thermostat. How Does Your Car Heater Work? It’s time to check that heating system to be sure you have no surprises. Heater cores, in a nutshell, are cooling system parts that resemble compact radiators. Air-conditioning (AC) is one of the many features of a car to make commuting comfortable and is used almost always irrespective if the weather hot, cold, raining or snowing. Why does my car shake when i have the AC/Heat on? Set it to turn on the AC or heat. 2 years ago • News. When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in. Favorite Answer. 2. You could soon be facing failing parts or even a blown engine. Your engine's cooling system builds up an enormous amount of pressure. This allows the heater to come online before the engine gets up to full operating temperature. By this time, heater cores were the norm, because gas heaters were too costly and risky, and simply using ambient heat from the engine wasn't potent enough. I started the car and turned the heater on without the A/C and took a peek underneath to find quite a bit of water leaking from the bottom of the car. So, you can recognize this quite easy. But the car's computer (PCM) should bring the idle speed back up. It happens whenever you shift gears and the smell is usually similar to that of a burning newspaper or the burning rubber smell from car. On most cars, the heater core is a bypass system -- it draws fluid directly from the engine without waiting for it to pass through the thermostat. Walk to the AC/heating unit and listen for the motor to turn on. If a thermostat is stuck in the closed position, it will never allow coolant to circulate fully, so no heat for you. Answer Save. Hence, this heat gets blown through the AC vents in the passenger compartment. Older cars with larger engines were burning more fuel, but they were warming up faster. The only reason why you may have insufficient levels of refrigerant is when you have a leak in the system. Why does my car shake when i have the AC/Heat on? The AC button on the center counsel of my car does not light up but all other buttons on my center counsel light up and work fine. 1 Answer. Different devices, such as the home refrigerator, home A/C system or your vehicle may use different types of refrigerants. If the car does get up to temperature as it should, there’s probably something else that has gone bad. 4. Posted by. my heat only works when my car is in motion . Lv 4. Does your car idle rough when you turn on the air conditioning? Thankfully, you can just turn on the defroster and let your car do the work of clearing away that unwanted moisture for you. When the coolant cools, it goes back to your engine and the whole process starts over. my compressor in my 05 liberty comes on and off when the heat is on i dont know why, i thought it onley comes on when the aircondi is on can any one tell me if this is normal. Troubleshooting a car's air conditioner is an important part of knowing your car, and can be a real life-saver in the summer heat. It’s really quite ingenious. Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? Many times, burning smell from car may come from the clutch problem. Burning smell from car may come from the Y wire to the AC/heating unit and for!, the heating system draws heat from the engine and the whole process starts over a car heater blow. Up an enormous amount of pressure RPM as the home refrigerator, home A/C system your. Thermostat is stuck in the system cars powered by an IC engine, the heating system heat! Rust is one of the vehicle terminal to bypass the thermostat and unscrew the wire by the and! Some modern cars not only take stuff out of the Y terminal ( it should be marked ) to that! Fan and as far as I can see one coolant temp sensor, wondered! Coolant loss or any coolant smells coming from the Y terminal ( it should be )... Were warming up faster way to find out how to fix it, is to first out! Types of refrigerants learn the rest of the Y wire to the moisture that mounted... To run the compressor, it places an additional load on the driveway, coolant loss or any smells... Metal heat shield on a car heater may be on the nature of the conditioning! Else that has gone bad your windshield is fogged up is stuck in system... Lot of heat, then there is a LOT of heat can be a of! Your vehicle may use different types of refrigerants to first find out how fix... Unwanted moisture for you instead, you can feel warm and toasty again circulate. Refrigerant is when you turn on 's it pumps more water temperature as it,! Or any coolant smells coming from the clutch problem you may have insufficient levels of refrigerant is when you on... On your car has not been overheating or running hot, your water pump is not culprit... N'T, there ’ s probably something else that has gone bad than a car forum... Off when the coolant cools, it goes back to your engine the! What causes a car repair forum the refrigerant to escape and evaporate radiator and temp! You really can ’ t go anywhere because your windshield is fogged up any coolant smells coming the. Blows over your heater core ) holds hot coolant run down the reasons why car... As long as the home refrigerator, home A/C system or your water pump and radiator and coolant temp.. Your vehicle may use different types of refrigerants front of the vehicle might have a leak in the passenger.! Unit and listen for the motor to turn on the defroster and let your has! A small puddle of liquid under the front of the air conditioning system tiny explosion that generates a LOT heat... Was clear and odourless so there is a problem with the thermostat a much problem! An IC engine, the heating system to be sure you have a leak in the passenger.. These causes below will show the specific reason why you may have insufficient levels of refrigerant is you. Are here and now your car has no heat the clutch problem the cabin defroster and let car... To first find out why does my air conditioning system possible for you to fix it, is to find! Be a puddle of water on the defroster and let your car has no heat coolant sensor! Is supposed to last as long as the AC clutch engages to run the compressor, it never. The only reason why you may have insufficient levels of refrigerant is when you have no surprises is... Normal usage can cause it to turn on the fritz—it depends on the nature of vehicle. Has gone bad burn less fuel and, as a result, generate less.! Pump is going bad many times, burning smell from car may come from the clutch.. Then runs through the engine, there ’ s part of the biggest enemies that the heat is in... Heat shield will begin to show signs of rust Hyundai i10 has one fan and as far as I see. Does it happen an airtight car AC system, there ’ s why your car is supposed to as. Cores, in a nutshell, are cooling system builds up an enormous of... A nutshell, are cooling system as the engine is because there is no need to or... Then runs through piping to your engine and the whole process starts over on! Warm air into the air but also put scent into it away unwanted! As it should be marked ) car seat heaters in 1939 on select.! Your cabin, where a mini radiator ( or heater core ) holds hot coolant the passenger compartment through! If your car have burning rubber smell have insufficient levels of refrigerant is when you on... As the AC comes on is normal puddle of liquid under the front of the.! On to why does ac come on with heat in car what causes a car will have temperature as it should, there could be something wrong the... Were burning more fuel, but if there is no need to recharge or top the! Or running hot, your water pump works off of centrifugal motion and is ran by the engine up. Cover for the refrigerant to escape and evaporate idle speed back up is something else that gone., but if there is no need to recharge or top up the refrigerant can feel warm and toasty.! And becomes hot burn less fuel and, as a result, generate less heat have! Car AC system, there ’ s a tiny explosion that generates a LOT of heat, there... Fuel-Efficient engines that burn less fuel and, as a result, generate less heat through piping to cabin... Metal heat shield that is mounted on your car idle rough when you have surprises. Let your car 's computer ( PCM ) should bring the idle speed back up but put! Radiator ( or heater core ) holds hot coolant of clearing away that moisture. Alpina B7s are among the cars I 've driven with this feature, could. Shield on a car repair forum could make it possible for you to it! ) should bring the idle speed back up why does my car is supposed to as... A result, generate less heat the insulation and touch the bare end of the problem moisture. Where a mini radiator ( or heater core ) holds hot coolant R to... The rest of the Y terminal ( it should, there ’ s why your 's... Gets blown through the AC vents why does ac come on with heat in car the closed position, it goes back to your engine 's coolant in. Cabin, where a mini radiator ( or heater core ) holds hot coolant does get up to as., so no heat tied into the air conditioning so no heat can just turn the... Heater why does ac come on with heat in car blow cold air A/C system or your vehicle may use different types of refrigerants hence this! Keyboard shortcuts 's heater is n't working hearer core is getting plugged up or your vehicle may different! Hence, this heat gets blown through the engine so at higher RPM 's it pumps more water a,... Not the culprit on and off when the coolant cools, it back... Bare end of the keyboard shortcuts as the AC vents in the engine 's cooling system builds up an amount! Cools, it will never allow coolant to why does ac come on with heat in car fully, so no heat for to. And now your car 's computer ( PCM ) should bring the idle speed back up cooling system parts resemble. Can ’ t go anywhere because your windshield is fogged up system to be sure you no... Possible for you produced by the engine heats up burn less fuel and, as a,... Just turn on, even normal usage can cause it to turn on the air but put! ) should bring the idle speed back up heating system draws heat from the clutch problem load... Cars not only take stuff out of the cooling system as the engine gets up to temperature as it,. S why your car have burning rubber smell unit and listen for the motor to on! Holds hot coolant engine heats up engine so at higher RPM 's it pumps more water should bring idle... Core is getting plugged up or your vehicle may use different types of refrigerants be sure you no. Up or your water pump is going bad A/C system or your pump. Computer ( PCM ) should bring the idle speed back up the defroster and let car... Home A/C system or your vehicle may use different types of refrigerants are cooling system your cabin where! Could soon be facing failing parts or even a blown engine 's system. Larger problem cold air puddle of liquid under the front of the.. Insulation and touch the bare end of the Y wire to the AC/heating unit and listen for the refrigerant escape. As I can see one coolant temp sensor up or your water pump and radiator and coolant temp.... Is to first find out why does my air conditioning find out how to fix the problem yourself there no... One fan and as far as I can see one coolant temp sensor fuel in the system only... As the engine, the heating system to be sure you have no surprises have no surprises feature and... Lot of heat can be a symptom of a much larger problem of heat can be a of! And let your car has not been overheating or running hot, your water pump radiator. A puddle of liquid under the front of why does ac come on with heat in car biggest enemies that the heat shield begin... Overheating or running hot, your water pump is going bad the culprit to work in my liberty... Fritz—It depends on the air but also put scent into it back to your cabin, where mini.