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My central ac system occasionally runs too long and the temperature gets way too cold. The digital thermostat reads that the temperature is too high so the ac still runs. This doesn't happen all the time but last night we had the thermostat set on 74 and when my wife got up during the night it was 67 degrees in the house (another thermometer read 67, the thermostat read 78)

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  • Anonymous Mar 25, 2014

    Have a Liebert unit for a data center that is tripping on high head. Suction and Liquid readings are good, and it will run until we hit cold weather (Logs show it usually happens on a cold night) ... Tested electrical and everything is good there as well. Thinking it may be a problem masking an even bigger problem...

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I have seen this is many digital thermostats. The worst problems usually come from the touchscreen thermostats. I would suggest installing a new thermostat. Make sure that you read the instructions before you even remove the old one.

Posted on Jul 03, 2008

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Posted on Jan 02, 2017

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Changed out water pump and thermostat and vehicle runs high temperature what could be issue?


Reasons the Temperature Gauge Reads High

If the temperature gauge reads high, it could mean your engine is overheating. Another reason your reading might be high is you could be losing coolant. A small leak or evaporation may cause your radiator to slowly lose coolant. A third reason your temperature gauge reads high could be because the thermostat is broken. If this is the case, you may need a coolant temperature switch replacement. The last reason the temperature gauge could read high is because of a water pump, or water pump gasket failure. If the water pump is malfunctioning, it may need to be replaced by a professional.

What to Do If Your Temperature Gauge is High

If your temperature gauge is reading high, it means your car is overheating. This is a very serious matter and you should never drive an overheating car. If your car starts to overheat, shut off the air conditioner and open the windows immediately. If this does not reduce the overheating, turn on the heater as high as it can go. If this still doesn't work, pull over on the side of the road, turn off the engine, open the hood carefully, and wait until the vehicle cools down. Never open the radiator cap while the engine is hot - coolant can spray and burn you. Once the vehicle has cooled, take the car to a mechanic right away so they can diagnose the problem. Cars are especially susceptible to overheating in hot climates, like what's common in cities like Los Angeles, Phoenix, Las Vegas, or Atlanta.
The temperature gauge is an important tool in your vehicle that shows the temperature of your engine's coolant. Contact YourMechanic and have your car inspected for overheating if it reads too high, as this can cause serious problems...

Reasons the Temperature Gauge Reads Cold

On most vehicles, the temperature gauge reads cold until the engine has run for a few minutes. If the temperature gauge still reads cold after the engine has warmed up, the gauge may simply be broken. Another reason the temperature gauge could read cold is if the thermostat in the vehicle stays open. With the thermostat stuck open, the engine can be overcooled, causing a low temperature reading. If this is the case, the thermostat may need to be replaced.

Oct 28, 2017 | Cars & Trucks

2 Answers

If my freezon would be low then why is it very cold air when I'm going on the road


because the temp difference between the hi and low side will be greater faster than a normally charged system the reason it cycles off is the keep the evap. from freezing up, but running to low on Freon can cause poor lubrication in the compressor causing damage to the compressor, yes it will blow very cold for a short period of time with a low charge

Oct 14, 2015 | 2004 Dodge Neon

1 Answer

I changed my thermostat and temperature sensor with AC the temperature gauge max out, it takes 45 minutes to max out, now the same issue still exist. Thank you and God bless.


no engine size stated, so there will be no Exact answers ever...
for that one fact..... (most posters fail here)
ok engine temp gauge, so....
ambient temperature is what,
are you at high altitude, ? or cold outside? just a clue here...
it's 100F here, so...
where the parts Jeep parts or aftermarket, ?
the thermostat, is it 180F, or higher, its stamped on this part.
wed need to know that, for sure.

ok, you got the wrong parts.
the dash guages is only a toy , we use a real pyro gun to read temps. at the STAT housing !!!
is the fan for RAD kicking.
not using real tools and real temp guages, means you are just guessing...
consider this.
old stat was bad, (most old ones are, they are short lived)
say it reads too low all the time, so you learn and expect its bad habits,
then put in the correct stat, (not stated what)
and now it works correctly
or
you had the 180F stat then put in the 200f and it runs hotter.
did you know the stat temp is regulated by the EPA here
are you here, ?USA? or not.
they make this car in Europe too, so..... (laws there are diffr)

or
Stat put in upside down.
or not with bleed hole (jigglepin) not up hill.
or have air on top of loop, causing the stat to go nuts and the ECT to go nuts (buy the wrong ECT,?) no name or pn. stated. so...

my guess is that if the gauge does drop , with heater on max
then the cooling system does have issues.
is it full of 50% AF?
take of cap of rad, dead cold
is it full
and at the next hot to cold cycle? is it?

Jul 21, 2015 | 2004 Jeep Grand Cherokee

1 Answer

Find the actual temperature at the thermostat from my cell phone?


You don't say what kind of phone you have, but assuming it's an Android or Apple smartphone, you should understand a few things. First, your phone won't read outside temperatures by itself. You can use weather apps that download reports from local weather towers in your area, but these won't tell you how warm your home is.

How can you measure the actual temperature in your environment? You can purchase an sensor attachment that you plug in to your phone, or you can buy a thermometer/thermostat that transmits data to an app on your phone. I'm familiar with the Nest, a mobile-controlled house thermostat that works with central AC systems. It comes with an iPhone/Android app that reports on temperatures and allows a huge degree of customization in your home AC settings, but it's very expensive at over $300. Westinghouse probably makes cheaper wireless models too, but these thermostats aren't worth the money if you have a wall heater or room AC.

Me, I bought a $15 instant-read digital food thermometer from Amazon.com and take temperature readings by pushing it's on button. Cheaper, faster and easy.

Nov 18, 2014 | Cell Phones

1 Answer

Setting start temperature on central heating thermostat


It sounds like your heating system has to little capacity to heat the home properly. 21 degrees is a reasonable temperature to expect but if the unit is running all the time and can't reach 21 degrees the heater is too small.
As far as setting the thermostat here is a link to the instructions.
http://www.salus-controls.pl/data/product/attach/rt300rf_-_eng.pdf

Nov 22, 2013 | Heating & Cooling

1 Answer

Humidity thermostat


I suspect the walls are warm and fooling the thermometers.

Aug 07, 2013 | Heating & Cooling

1 Answer

Where is the coolant bleeder on a 1998 ford taurus 3.0 engine


You can bleed the system of air by removing the radiator cap while the engine is cold. Turn the heater on high and let the vehicle run until it reaches operating temperature. The thermostat will open several times and purge the system of air. Feel the top radiator hose occasionally until it heats up. Don't forget to replace the radiator cap.

Jan 02, 2013 | 1999 Ford Taurus

1 Answer

A/c recharge what is thew psi for refrigerant


Below are normal car AC pressure readings with 134A.

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience.

If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system.

Thank you for using fixya and be safe.

Jun 17, 2010 | 2002 Ford Expedition

1 Answer

My refrigerator constantly runs and is not cold enough. Could it be the control temp?


THE CAUSES FOR THE PROBLE4M OF LOW COOLING MAY BE
  • Freezer fan and its circuit problem.
  • Defective fan motor.
  • Defective defrost timer,defrost heater or defrost terminal thermostat.
  • Temperature control failure.
  • Compressor motor defective. Inefficient compressor (low wattage readings).
  • Condenser fan.AC circuit to fan open (high wattage reading). Defective fan (high wattage reading).

Aug 19, 2009 | GE Refrigerators

1 Answer

1997 Subaru Outback with temperarure problems


check the coolant level - you may have low coolant, causing the sensor to occasionally read an air pocket. If you don't correct this you will burn out your motor.
We had this problem & eventually replaced both the thermostat and radiator cap, being careful to bleed out any air pockets by running the engine form cold with the heater on hot and the radiator cap off - keep watching & topping up the coolant as the enigine heats & the thermostat opens.
Good luck!

Oct 26, 2008 | 1997 Subaru Outback

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