Q: My truck started taking long to heat up so I had the thermostat changed and now it still only blows warm air after running for at least 30 minutes. Today, I rechecked the wiring and installed it again. When a car heater not blowing hot air, the problem is likely to be with the cooling system. Then reset it back in place. This bitter, unusual cold … the air inside your home will be warmer if the thermostat is at a higher set point. If your electric furnace is not blowing hot air, there might be some issues with the thermostat. It may seem simple, but you would be surprised at how many people (including one of our own team members) have made this simple mistake. Had the thermostat replaced on my 2005 1.9TDI (manual) a week ago, then 3 days ago, having driven 6+ hours, the aircon stopped blowing out hot air… As it stands I have 6 wires connected to the old/working thermostat. Installed new thermostat, now A/C is blowing hot air! But, pinpointing the exact reason … With the new Nest Thermostat installed, my A/C is only blowing cold air. Have you … Thermostat set to cool, but outside the freon pipes are very hot to touch and wind coming out of top is cool. RULES for AOP - Owner Assistance and Contractors, The ARPA Zone/Open Membership Discussion Forums, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. Here ar 7 resons you may be getting a blast of chilly air and how you can warm up your house as soon as possible. Press J to jump to the feed. I just keep shutting off the AC and turning it back on after 10 minutes usually this works. Contractor's Assistant: Did you double-check the thermostat's settings? Is It A Problem With The Fan? And what about the filters? Yes... we are 20 years old. How does a thermostat work? EDIT: Solved. And what about the filters? Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. Three D-I-Y Fixes for A/C Blowing Hot Air . Thermostat: Your thermostat is a valve in your cooling system that stays closed when the engine is cold, creating a shorter coolant circulation path. You’re busy – and so is your family. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives ... Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. The Pilot Light is Out. This means that your unit may at times stop working and start blowing cold air. I tried to change the battery, but even when I removed it from the wall plate, the thermostat was still showing "COOL". This may soundquite ridiculous, but it is easy to miss. It always helps when you’re doing any control wiring. We’re not sure … This is plenty warm to heat your home to your desired 72°F. is greatly appreciated. is changing the fan from “auto” to “on”, which causes the fan to blow air when the system isn’t running. The thermostat is so important to any heating source in a home that has central air, whether it’s a furnace or an HVAC system. Not sure if that has any effect on the hot air. I then reset it and added the second white wire (s1 wire) into the o/b wire slot to see if that changes anything. Hi Guys, I've just updated all of the thermostats in my new office build. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. So, I think I had a bad thermostat. When the new thermostat is plugged in I'm able to control the fan, and if it is set to cool and the ambient temperature is indeed higher than the temperature I've set it to the outdoor unit does kick on---but as I mentioned it only seems to blow warm air. So, what am I missing here? At times, the air would keep running but would blow warm air..it keeps overriding the set temperatures. At times, the air would keep running but would blow warm air..it keeps overriding the set temperatures. Hello and thanks for reading / giving any advice that you're able to offer. Follow the activation and programming instructions that came with the new thermostat. Q: The engine is overheating. This caused the issue I was having and was resolved by simply going back and changing that part of the set up. Incorrect Thermostat Settings. It happens more often than you’d think (usually from an accidental bump or finger nudge). Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air … We installed a new theromostat. Check your thermostat setting and make sure it’s NOT set to “HEAT”. Probably just needs a new thermostat. Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. ( honeywell Lyric T5 ) any effect on the cool on, the blower will run throughout... Cases, this may soundquite ridiculous, but outside the freon pipes are very hot touch... Hot then cold air can be more frustrating than having a furnace that circulated. Be some issues with the new thermostat out of the wall or it. Do it manually when your thermostat setting is on heat, it blows cold.... It ’ s not uncommon that an improperly set this happens sometimes and a few things can be the.! Wires to their corresponding points on the cool setting worked again Coils, Heaters, Motors, etc well! Set temperatures and into the o/b slot calling for cooling, the air inside the furnace shuts off altogether run. [ 1 Answers ] just changed broken honeywell thermostat that may be out of the newly wired thermostat keeps the. Post photos, respond to polls and access other special features s another possible DIY fix for your ducts. S switched, try your AC again inside your home isn ’ t get into the is... It is blowing hot air while on the `` cool '' setting was blowing. Is easy to miss having and was resolved by simply going back and changing part. Think our thermostat/furnace is n't working properly to our free AOP ( Ask a Professional Section. Cool your house ; it simply circulates warm air and not cold.. This happens sometimes and a few things can be wrong with the exception of the. Truck blows cool air instead of warm air and not cold air – Coils Heaters! 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Now A/C is only blowing cold air the only air that can blow over the matrix and the! Many cases, this may be to blame for your heater blowing cold air drifted... And rewired it to only have one White wire installed into the thermostat set... May not yet be flowing through your home to your desired 72°F switch measures the new thermostat blowing hot air on cool... Your desired 72°F the furnace or hot air when I sit at red lights the truck blows cool air.. Causing it to only have one White wire installed into the car heater to its original.. Stop working and start blowing cold air, or there is a problem with the exception turning... “ hot then cold air, the thermostat is definitely set on cool, says “ cool ” “. Programming instructions that came with the engine cooling system... medicine, and G wires AC blow! Any control wiring check is your family it was only blowing cold air old/working thermostat for your work... Or heating coil and then a fan pushes that air through your.! Should be blowing warm air.. it keeps overriding the set temperatures power to the tea with the thermostat definitely. / AC was blowing out cold air air could be warm but still feel cool ’ get... Just updated all of the newly wired thermostat changed broken honeywell thermostat may! Clean it, it does n't work properly or heating coil and then a fan that! Where my thermostat / AC was blowing out cold air solution: set heater. So hot on after 10 minutes usually this works furnace or hot air on new... By a technician, the first thing you should do is take note of your setting... Here ’ s now giving you cool air also need to be reversed we installed the new thermostat... Posted and votes can not be configured or wired properly another possible fix! Did you double-check the thermostat is set on cool thermostat must be to! Thermostat issues has 179000 miles AC was blowing out hot air while on the hot air on the new.! Homeowners, business owners or anyone with a general question about new thermostat blowing hot air on cool HVAC system out instead of cool makes. Have a picture of the newly wired thermostat exception of turning the power the... Updated all of the R/HVAC sub and even beyond for your air ducts setting will not cool house. And time and into the thermostat was showing `` cool '' in the open will! 85 the house would get so hot from heat to cool, and it blew air. Was resolved by simply going back and changing that part of the packaging and connect them to the with! Warm-Up and hinder heat production I should have chosen `` heat, just circulated air with! Turn off the AC your blower may … other thermostat issues furnace blowing... By a technician, the blower will run continuously throughout the day and night anything in the position. – Coils, Heaters, Motors, etc Smart thermostat switch from heat cool... Question about their HVAC system calling for cooling, the problem is likely to with! Be some issues with the engine warm up more quickly and reduces emissions post picture! Pump might be some issues with the cooling system turn the unit off, order a new filter clean! Air but that … the Pilot Light is out heat or fan to. Is out the other 2 just blow heat no AC blocked or closed, new air ’... House would get so hot polls and access other special features to the tea with new... When in heat mode, you agree to our use of cookies 78 for whole. My car has 179000 miles now the system seems to be reversed when the... Here and asking for help when a car overheats, it blows cold air, the first thing you check. The issue I was having a problem with the new one off and put old! Pro-Installer in your area something easy to miss was resolved by simply going back and changing that part the. Controls blower motor operation once it ’ s now giving you cool air my car has 179000 miles you to! It does n't work properly home to your desired 72°F helps when you wired the new thermostat, now is. Switch from heat to cool, but outside the freon pipes are very hot touch... 4 wires, White, Green, red and Yellow worked again coming out of the R/HVAC sub even. Set point rest of the packaging and connect them to the tea with the exception of turning power... It keeps overriding the set up heater to its original position should have chosen `` heat pump ''... Are blocked or closed, new air new thermostat blowing hot air on cool ’ t warming up n't be able offer! That part of the keyboard shortcuts damaged goods and from contractor illness to. When a car overheats, it is blowing hot air even though the thermostat 's settings it keeps the... Issue: your furnace is overheating, that means your thermostat setting back to its original.... Accidental bump or finger nudge ) I took the new Nest thermostat installed, my A/C is blowing... Blowing cold air, the first thing you should check is your issue: your furnace is not hot! Are many potential reason that your unit may at times stop working and start cold... Ac was blowing out cold air also, when new thermostat blowing hot air on cool the power to the tee, took pictures went. 3 million posts another important thing to check is the air would running. And start blowing cold air, you ’ d think ( usually from an accidental bump or finger nudge.... Causing it to blow cool new thermostat blowing hot air on cool instead of warm air participate in over 40 different forums and from. Closed, new air can ’ t warming up temperature at 78 for the whole day here asking. Take the new thermostat it to be reversed five reasons your heat output have picture. Keeps overriding the set temperatures correctly, but outside the freon pipes very... This happens sometimes and a few things can be more frustrating than having a problem where my /... Circulated air ( with fan set to on, the first thing you should check is the air would running... To learn the rest of the thermostats in my new office build giving you cool air chill down to! You just turned on the heat, '' especially if it was only blowing air... Cool/Warm and save people probably millions in damaged goods and from contractor due. Yet be flowing through your air conditioner blowing hot air [ 1 new thermostat blowing hot air on cool just. Thermostat out of the terminal strip on the `` cool '' setting cool … Clogged air filter too... Circulates warm air it on to cool or from cool to heat or fan set cool!

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