can a bad car thermostat cause ac not to work

When you turn the heater on, a valve opens in the heater core line and allows hot [engine coolant]( to flow into the core. While some car guys would scoff at the idea of a thermostat interacting with an AC system, the fact is that the modern automobile is a collection of systems working together. The components inside the thermostat … If the thermostat is stuck open, not allowing the engine to warm up properly, there won’t much, if any, heat in the passenger compartment. I have read online that if the hoses leading to the radiator from the thermostat are cold then that means the thermostat is bad, but would that be the reason why my defrost doesn't work properly? Can A Bad Thermostat Cause The Cooling Fan To Not Kick In In My 91 Honda Civic Sedan I tested the cooling fan away from the car and it works. If your thermostat is level, try adjusting the anticipator. Air conditioning compressors put a fair amount of stress on the engine, generally sucking up between 10 and 15 horsepower when active. document.write(new Date().getFullYear()) costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive The first thing to check is the settings. HOW TO KNOW IF THERMOSTAT IS BADIn this video we will explain what are the symptoms of a bad thermostat. Question: Would a bad thermostate cause … All metals expand as they heat, and different metals -- and different thicknesses of metals -- expand at different rates and by different amounts. I think if I just let it keep going, it wouldn't have opened while the car was running. The average engine maintains internal component clearances often less than 1/100th of an inch, which doesn't leave much room for metal expansion. Is this my thermostat not working? If a thermostat … A bad thermostat can cause the car to swelter, as the thermostat is a heat-sensitive control device situated at the radiator hose. The air conditioning is a completely separate system.They are not related. Second (and … You pause to flip your jacket collar up, and you walk briskly to your car door and slide into the driver's seat. A thermostat that is stuck open will keep the motor from reaching operating temperature and the heat inside the car seems to take forever to get hot. Let Ambient Edge help you. Your car's AC system puts... Hey there. Engineers must design an engine with the clearances at a specific temperature in mind, and that's usually somewhere around the boiling point of its coolant. Replacing this part does not require a lot of knowledge of cars, but you do need to have some mechanical experience to keep you from damaging anything. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. Anyway, a blown fuse between an AC and your thermostat is kind of like a bad battery in your car. Solution: Your mechanic can test the thermostat and replace it if necessary. The thermostat is the nerve center of your home’s cooling system. A faulty thermostat can also make your temperature gauge read lower than normal and turn your check engine light on. There are a number of problems that the AC thermostat can cause, including refusing to allow the air conditioner to turn on at all and not letting it reach the programmed setting. The AC system is a completely separate entity; the only connection it has to the engine is at the compressor pulley, which derives its power from the crankshaft. Thermostat - A faulty thermostat can cause too much or to little cooling. When I start the vehicle I smell what could be antifreeze, just not sure if I should jump to replacing the heater core or hope the thermostat dose the trick. In such cases, although you will need repair technicians to fix the thermostat, you shouldn’t have damage to the AC itself that will need work. Please see our. Was this done while you were at the mechanic? Other than that, the AC system could care less what the engine is doing. I'm pretty sure I installed the thermostat … If the engine overheats for any reason, this can cause the thermostat to fail. This can be caused for a variety of reasons such as a malfunctioning thermostat, a radiator not flowing properly, a faulty coolant temp sensor or AC refrigerant not properly being supplied to the AC compressor. Under most circumstances, a bad thermostat will not have any effect whatsoever on the air conditioning system. Car engines work best when kept at a certain temperature, typically between 160 and 240 degrees Fahrenheit. I would recommend a heater inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, confirm this diagnosis, and give you an accurate assessment of damage and cost estimate for repairs. If the engine is overheating, then the coolant level should be checked. When your thermostat does not respond properly to the temperature conditions in your cooling system, you can have a problem. With the cover off, … The thermostat senses the heat of the engine, and then uses that heat to open and close a valve. While the AC and cooling system are mechanically independent, that doesn't necessarily mean that a malfunction in one can't affect the other. The system may be low or may have an air bubble trapped in the system. If your thermostat still isn’t working, there’s a good chance it’s a bigger problem—possibly something with the wiring, or an issue with the heat/AC itself. A car's heater core is like a second radiator. Thus, if this happens, one of the possible c… Please note that the cooling system should never be opened or checked while... A coolant leak can come from leaking hoses, a bad head gasket, an intake gasket, or a number of possible locations. This thermostat is responsible for monitoring and regulating the coolant temperature in your vehicle's engine. However, if you are smelling coolant in the passenger area, chances are the heater core is leaking as well - not … Filter – The most common cause … If the thermostat is stuck open, not allowing the engine to warm up properly, there won’t much, if any, heat in the passenger compartment. SYMPTOMS OF A BAD THERMOSTAT ON CAR. An AC system works by compressing a refrigerant gas into a liquid (thus increasing its heat), passing it through a radiator (the condenser) to bring it down to ambient air temperature and then releasing that pressurized liquid into a low-pressure chamber to turn it back into a gas. In the high heat of summer, and in the slightly cooler days of fall, we still get the call. technicians, Trusted mechanics, rated by thousands of happy car If you’re facing air conditioner not cooling problems, continue reading to see your options. The Air Conditioner Suddenly Stops Working. Replace the heater core and/or fan and you will have heat. Corrosion in the connectors is also a known problem here. Clean and spray … With this many miles, most cars would have been completely worn out. 7 Most Common Causes for A/C Not Blowing Cold Air. Check whether the thermostat’s display is lit. If you can write back in with the exact Diagnostic Trouble Code (DTC) that Autozone downloaded for you, we can give you a more precise answer. The last thing you need is to set your thermostat only to realize your A/C system isn’t working as it should. It could also mean a problem with the sender or gauge. Of course, if your car's engine overheats by that much, then odds are that you've got bigger problems than liquefied Butter Pecan. Cabin air blows through the hot core and into your car to warm the occupants. Settings can inadvertently get changed, or … Rowe studied engineering, philosophy and American literature at Central Florida Community College. There are a few things that might cause your furnace to “ignore” a call for heat from the thermostat. Testing the Thermostat in Hot Water Drain the coolant from the radiator. At the very least, the thermostat should be changed since it really isn't an expensive or intensive repair. If left unattended however, your vehicle could run out of coolant and subsequently overheat. The heater core looks a lot like the radiator in miniature scale. That super-chilled gas cools another heat exchanger (the evaporator); air passing through the evaporator picks up some of its coolness, flows into your car and keeps your ice cream from melting. A thermostat is a valve in the cooling system that closes when coolant temperatures are low, in order to recycle coolant through the motor and bring it up to the ideal temperature. However, thermostat problem affect your ability to control the HVAC system, and as a result are just as bad as having a problem with … If your car has not been overheating or running hot, your water pump is not the culprit. Actually, you might have blown two fuses: the literal fuse connected to your thermostat and, if you're angry about your AC not working, an internal "fuse." There are other times the thermostat malfunctions and can cause big issues with the AC. When an air conditioner or furnace does not work properly, the problem may actually be with the thermostat. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. The first thing that can … The AC system is a completely separate entity; the only connection it has to the engine is at … Heater Core. If you're a physics geek interested in such things, that's an extra 424 to 636 British Thermal Units of heat energy per minute that the cooling system must dispose of in order to maintain equilibrium. There are a few common causes for the AC blowing hot air, the most common is that the vehicle is low on refrigerant, other causes could be the blend motor has failed or the compressor is not working properly. In fact, the inside of the … This would certainly solve the temp gauge and engine temp. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, "Maximum Boost: Designing, Testing, and Installing Turbocharger Systems"; Corky Bell; 2003, "Fundamentals of Engineering Thermodynamics"; Michael Moran; 2007, "Automotive Heating and Air Conditioning, 3rd Edition"; Haynes Publishers; 2000. If the thermostat is stuck partially open, you will have heat inside the car but you may overheat the motor, especially when not … Instead, you might have a failed thermostat, which opens and closes circuits in the cooling system as the engine heats up. When the temperature of the engine reaches its normal operating temperature, this device should open to allow coolant to flow into the engine to regulate the heat. A defective thermostat that is stuck in the open position will delay warm-up and hinder heat production. The first being to power the display so that you see the current settings on the stat and to just them accordingly. Depending upon your particular engine/compressor combo, the AC system could add 10 percent or more thermal load to the cooling system. the problem is that it does not kick in while it’s in the car. YourMechanic All rights reserved. A broken knob or completely worn out electrical contact inside of the switch may cause one … Once you start your car, it’s only moments... No No matter what kind of car or truck you drive, it has a thermostat in it. In In the dead of winter, when the cold air is nipping at your heels, nothing is better than climbing into a nice, toasty warm car. If your thermostat sticks closed and the engine begins to overheat, your car's computer may well shut the AC compressor down in a last-ditch effort to reduce the thermal load on the system. Adjust the Anticipator. When coolant temperature rises to the engine's ideal, the thermostat valve opens to send coolant through the radiator in order to maintain that temperature. This can be noticeable in a variety of locations, but most commonly around the thermostat housing.

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