Why does the temperature gauge on my AC not work?

The temperature gauge dropping should not matter to the AC system as it only cares that the coolant temperature is below 253 degrees. However it could be a symptom of the problem.

What causes an engine temperature gauge to stay on cold?

Reasons Why your Engine Temperature Gauge Stays on Cold 1. Faulty Engine Coolant Temperature Sensor 2. Faulty Gauge/Cluster 3. Broken wires to the sensor or to the gauge 4. Bad Thermostat 5. Corrosion in connectors 6. Air in the coolant system 7. Broken engine control unit

Can a temperature gauge be replaced on a car?

However, most temperature gauges are integrated with the instrument cluster on modern cars. In some cases, you can replace the temperature gauge or repair any bad solderings if you find any. In other clusters, you may have to replace the instrument cluster.

What causes an engine temperature sensor to go off?

1. Faulty Engine Coolant Temperature Sensor. The most common problem when it comes to a faulty engine temperature readings is the coolant temperature sensor itself which is sending the information to the cluster.

The temperature gauge dropping should not matter to the AC system as it only cares that the coolant temperature is below 253 degrees. However it could be a symptom of the problem.

What happens when your coolant temperature sensor is bad?

The engine is very sensitive to wrong air-fuel mixtures at idle and this is a condition when you might notice that something is wrong with your engine coolant temperature sensor. The engine coolant temperature sensor can have a hard impact on the air-fuel mixture. A bad air-fuel mixture can also cause the engine performance to drop drastically.

What to do when your car a / C stops working?

Temperature gauge drops to 100 and A/C stops blowing cold air. I can do battery rest and it works again for a short time. I have changed the engine coolant sensor and the ECM and engine temperature sensor.

Why does my car take so long to get up to temperature?

The most likely scenario is that you only have a single malfunction: your thermostat. If it’s open all the time, the engine will take much longer to get up to temperature (as you’ve noticed), and some/most AC systems are completely paranoid when the engine isn’t at it’s operating temperature or isn’t cooling normally.

Why is the temperature gauge on my trailblazer not working?

My question is to Ken the Administrator. In a previous blog about 2008 Trailblazer with a temperature gauge intermittently not working and setting code 128, you stated that it traces back to the BCM. Could you kindly explain how the BCM controls this?

When does the a / C stop blowing cold air?

Drove it around for about 10 mins and the car stayed at 210 on the gauge (as it should) and the a/c worked fine. This lasted for 2 days and then it went back to dropping the water temp, killing the a/c.

What to do if your coolant gauge is not working?

Run the engine for about 20 minutes to get it up to temperature or until the gauge says you’re running hot. Open the hood and take a look at your coolant tank. Most tanks should have two lines marked on them, the top one reading as “full/hot” or something very much like that. Your coolant should be at that line after 20 minutes of running.

Why is my a / C off and engine temperature gauge not working?

A/c off and engine temperature gauge is a problem I have on my h3 hummer 2008 as well. I changed my coolant temperature sensor too but that didn’t work. I accidentally found out that when I play with the hvac knob the a.C light Engine temp. Gauge acts crazy causing my a.C to turn off.

Why does the AC on my car stop working?

Every now and then the temperature gauge drops to zero and “ac off” warning appears on screen and ac stops working. This has been going on since two months.

Why is the temp Gage not working on my 2008 Trailblazer?

I have the same problem with my 2008 trailblazer., Temp gage not working and A/C not working, Intermittent problem, any one have a fix? Any decently equipped auto repair shop can use a *professional quality scanner* set to functional test and check the signal to ALL GAUGES in the instrument cluster..

Using your coolant temperature gauge as an example, the diagnostic procedure involves locating and disconnecting the sending unit. With the ignition on, the gauge should register cold. If you connect the sending unit wire to ground, the gauge should switch to read hot.

Every now and then the temperature gauge drops to zero and “ac off” warning appears on screen and ac stops working. This has been going on since two months.

What to do if your a / C is not working?

Jesus S suggestion work. I had the same problem. A/c was blowing cold air for a few minutes then stopped blowing cold air but blow motor was blowing hot air. Next the temperature gage was not working. Disconnected battery for a few minutes and reconnected and the temperature gage is working and the a/c appears to be working.

What does it mean when gauges in your car stop working?

But when the gauges in your car stop working, it’s not a situation you can safely ignore. When one gauge stops working, the problem may be in the gauge itself or a bad sensor, while all the gauges cutting out at the same time often indicates a blown fuse or a defective instrument cluster.

Why does my car gauge read cold when I Turn on the ignition?

With the ignition on, the gauge should register cold. If you connect the sending unit wire to ground, the gauge should switch to read hot. If the gauge moves as expected, then you can suspect a bad sending unit. If the gauge doesn’t move when you ground out the sensor wire, then you can suspect a bad gauge.

What to do if your gas gauge does not move?

Check the gauge if the needle moves toward “Hot”, the wire from the gauge to the sending unit has an open or bad connection. If it does not move, connect a test light by grounding one end to a good known ground and the other end to positive side of the gauge (typically a pink wire). If it does not illuminate, ensure the gas gauge fuse is good.

Where is the temperature gauge on a car?

The part, which is normally located near a vehicle’s thermostat near the base of the radiator (consult your owner’s manual or repair guide) can get gunked up and fail. Using an OBD2 scanner, check to see if the CTS is providing live temperature readings.

What happens if you lower the AC temperature too much?

Lowering the temperature too much only makes your air conditioner run for longer, increasing wear and tear on your AC along with your bills. Reduce Wear and Tear on Your System with a Programmable Thermostat Lowering the temperature too much can ultimately reduce the lifespan of your AC system, and it raises your monthly bills.

Why does my car’s temperature get high when I turn the AC on?

Dashboard gauges are not very accurate. If the needle goes a little higher than normal when you have the A/C on and as long as it stays within the normal range (i.e not in the red) then that is normal. Particularly if you have a smaller engine like a 4 cylinder, it has to work harder when the A/c is on.

What should the temperature of the air conditioner be?

Most people have a specific preference for the temperature in their home. While some homeowners are perfectly comfortable keeping the thermostat set to 77 or 78 degrees Fahrenheit, others believe that their air conditioner should keep their home feeling like an icebox.

When does the coolant temperature warning light turn on?

The coolant temperature warning light turns on when your engine is sensed to be too hot and is at risk of damage from overheating. Is it safe to drive with the coolant temperature warning light on?

What are the symptoms of a bad coolant temperature sensor?

Hence, it is advised to have your car inspected right away to avoid any serious problems. Here is a more detailed list of the common symptoms of a bad coolant temperature sensor. One of the first symptoms you will notice is that the check engine light will activate.

How does a mechanical temp gauge work?

A mechanical temperature gauge uses a bulb submerged in the engine’s coolant with a capillary tube connecting it to the gauge. As the temperature increases, liquid in the tube expands, which causes a curved tube, called a Bourdon tube, to move the needle on the gauge.

How to check if your car cooling system is working?

Verify that the cooling system is filled to the proper level and using a Tech 2®, verify that the thermostat is opening at the proper temperature. If everything is functioning properly, reprogram the PCM with a new service calibration using the TIS2WEB Service Programming System (SPS) application.

Why does the coolant temperature gauge stay on cold?

The most common causes of a coolant temperature gauge which stays on cold are with the coolant temperature sensor itself. It’s recommended to check this component first. If you have more questions about this topic, you are welcome to leave a comment below, and I will try to answer your questions as fast as possible.

What are the symptoms of an intermittent AC?

Today, similar symptoms. Ice cold air for 20 miles this morning. Parked car for 1 hr. Ice cold air for next 10 miles. Parked for 1 hour. Ice cold air for 15 miles Parked all afternoon. Ice cold air for 30 miles on way home, but got hot air for last few miles. Chills so well, when it chills, hard to believe it could be low on freon.

Why does my AC take so long to cool down?

Solution: Well, you can’t change the weather. But if everything is working correctly in your AC, that means it’s just one of those 1%, super hot days. If your filter looks like the one on the right, it’s dirty and it’s time to replace it. Believe it or not, but even a dirty air filter can prevent your AC from cooling your home.

What to do when your air conditioner is intermittent?

As we approach the summer months, air conditioner use becomes a daily ritual; discovering that the AC functions intermittently could be devastating. When an air conditioner begins to fail, the most common thought is that the AC needs a refrigerant recharge.

What does low side gauge on air conditioner mean?

Then the low side gauge will climb back up to 45 psi as the high and low side equalize. At this point, he compressor will kick back on and the cycle will repeat itself. This is called short cycling. This rapid cycling of the compressor is a good indication that the system is low of refrigerant.

Why is my outdoor thermometer not reading the temperature?

The simplest approach to figuring out why the unit won’t read outdoor temperatures is to consider swapping out the batteries in the sensor for new batteries. As battery power fades, the sensor has trouble relaying info to the unit since the data has to “travel” through doors and windows.

Why is the outside temp display not working?

I have no idea on how it works mostly, but i do know that the temp control unit behind the HVAC knobs is the computer that calculates it, the display up top doesn’t do much else but show it. You may want to just unplug the HVAC section for a few minutes and plug it back in. Click to expand… I can try to umplug it..

What causes a temperature gauge to stop working?

However, there are other reasons, for example: A bad temperature sending unit (the second most common reason) A problem in the temperature gauge’s electrical circuit A fault in the control circuit from the car’s computer (depending on vehicle model) A bad temperature gauge

Why does temperature gauge not working?

There are many reasons your car’s heater isn’t working. Maybe the fan is malfunctioning. Perhaps your temperature gauge is running below normal. There could even be a puddle of liquid under the front of the vehicle. A lack of heat can be a symptom of a much larger problem.

Why is my temperature gauge in my car not moving?

Reasons Why Your Engine Temperature Gauge Stays on Cold Faulty Engine Coolant Temperature Sensor. The most common problem when it comes to a faulty engine temperature reading is the coolant temperature sensor itself which is sending the information Faulty Gauge/Cluster. The next most common problem is a faulty temperature gauge. Broken Wires to the Sensor Or to the Gauge. Bad Thermostat.

Why is the engine coolant temperature gauge not working?

Another common reason for a faulty temperature gauge is air making its way into the radiator hoses. Air can pool near the temperature sensor or the thermostat and cause faulty readings (or no readings at all). It can also affect the car’s overall cooling efficiency.

Why is my ambient air sensor not working?

The BCM provides the voltage source for the ambient air sensor so low system voltage would affect its accuracy as well. The SM clearly shows the ambient air sensor is involved in the compressor control logic. The OP also mentioned some other weird things happening which can be attributed to low system voltage.

Why does the temperature gauge on my AC not work?