Questions tagged [hvac]

HVAC - Heating, Ventilation, Air Conditioning.

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1answer
12 views

2005 ford free star v6 front wheel drive

I have a problem with my A/C where it blows air fine in the rear but it wont blow in the front dash only by the feet and i noticed when i disconnect the battery everything works fine ontil it just ...
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1answer
15 views

2010 Jeep Compass makes a smacking noise under the dash when the fan is turned on

It does not matter if it is heat or ac. My ac compressor quit and I replaced it and had air for one day. Checked the vacuum and the freon all looks great it quit working when the noise started coming ...
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2answers
26 views

A/c malfunction

What could cause the pipe out the compressor of the car to be too hot, I mean too hot to be touched with a bay hand, while the pipe after the condenser is slightly warm or rather normal.Then I noticed ...
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1answer
20 views

2013 Focus SE Dash Vents not blowing AC or heat, all other vents work fine

The climate control in my 2013 Ford Focus doesn't blow anything out of the dash vents. Defrost and floor vents blow fine and I can select between them without issue, but when I select only the dash ...
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1answer
25 views

2018 Toyota Camry - Loud Idle When AC is On

I have a 2018 Camry (less than 5K miles), and when it's in gear with my foot on the brake, it has a loud idle. The first time I heard it I was in line at a McD's and I thought to myself, "I hope that ...
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3answers
90 views

What is the purpose of high pressure service port in cars ? Can we charge refrigerant into the system by high side service port?

I have read on internet and in Tesla Model S service manual book that we can charge refrigerant by high pressure service port (with gas charging machines or another way) as long as there is vacuum in ...
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0answers
78 views

Why may heating gradually stop after some time driving (and doesn't work in passenger side at all)?

This is a somewhat strange problem. Heating (in driver side) seems to work normal - after somewhere between 15-25 mins. driving or so, it gradually stops working. The warming in passenger side doesn't ...
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0answers
35 views

How to keep air recirculation on permanently

I am looking to find a way to have the recirculation always in the ON position for my 2018 Toyota Rav4 Hybrid Limited. I understand it's unhealthy to leave the same air in your car but I don't ...
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0answers
43 views

Why ambient temperature used to measure pressure for car ac system

Since the ac system is located mostly inside a car engine and the car is warmed up prior to adding freon, and the temp/humidity in engine bay is different from ambient temperature//humidity, and all ...
2
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2answers
1k views

What happens to car A/C when outside temperature is very low (about 55 degrees fahrenheit)?

I bought a used car and its the first winter since I had this car. A/C in summer was working just fine. But today I saw the outside temperature was about 55 degrees and I turned the A/C to the blue ...
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0answers
91 views

My Air conditioner is blowing hot on the left side and cold on the right

My air conditioning in my Camaro ss 2012 is blowing hot on the left side and cold on the right. Anyone knows what the problem could be??
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2answers
2k views

Is it okay or useful to run heat and AC at the same time?

Most cars that I've seen in my life have a heat slider or dial, which goes from coldest to hottest, and also a button or switch that is labelled "AC". When the heat dial is set to cold, turning on the ...
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1answer
22 views

Blower stopped working

My blower stopped working suddenly on my 04 Trailblazer. I figured it was the resistor but as Murphy's law would have it, the battery died a few days later. I replaced the battery and the blower ...
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1answer
37 views

Blower motor not blowing

I have a 2006 Chevy Equinox and the blower motor will not blow at all. I replaced the blower motor and it would blow intermittently for a few days then stopped all together so I then replaced the ...
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0answers
35 views

1999 Honda Accord HVAC gets stuck on dash mode

The HVAC on my 1999 Honda Accord gets stuck on the dash mode. All of the control buttons work and I can cycle from one to the other until I put it on dash only mode. Once there, the motor stops ...
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3answers
1k views

Does outside temperature sensor affect the HVAC system?

Car: 2010 Mazda 3 2.5L Manual My car's outside temperature display is way off. It is showing warmer than the actual temperature. For example: Today the real temperature was -9C and it showed +18C. ...
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1answer
204 views

No heat when idle

I have a 2013 Dodge Grand Caravan. I had the heater core replaced recently and now I don't have heat on the right front passenger side. I have flush the line both front and back and ensured the ...
3
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2answers
177 views

Can I replace my AC Compressor myself? 2008 Vauxhall Astra 1.9

On my 2008 Vauxhall Astra 1.9 CDTI my AC Compressor has gone I was wondering how easy it is to replace myself? I'd get the system drained at a garage first. I've included the service instructions ...
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0answers
280 views

Clicking sound from AC on startup

I have a 2008 Jeep Grand Cherokee that makes a very loud clicking noise when I turn the AC on just after starting the car. It only happens every so often and it lasts about 20 seconds. It sounds like ...
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0answers
81 views

Diagnosing AC performance after repair

Background: Vehicle is 92 Civic with R-12 AC system. Compressor was replaced 2 years ago due to leak diagnosed there by AC technician (not sure if that was actually the problem). All but about 100g of ...
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0answers
26 views

Ford Expedition Rear HVAC not turning on

I've turned the selection dial on but the rear HVAC unit isn’t coming on. I've checked to see if everything is connected but it's still not working
1
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2answers
89 views

AC cycle off too long when driving

My AC system has been problematic recently on 2014 Ford with barely 31000 miles. Its uses Visteon 16 compressor. When driving, after some minutes, it will shut off for long enough until the vent ...
2
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1answer
24 views

Excessive A/C condensate on outsideof box

When running the A/C on my 2011 Chevy 2500 Duramax the outside of the heater box gets saturated in condensate. After 1 hour of running i'll have a 1/4" deep puddle on the passenger floor. It's not a ...
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1answer
530 views

AC Compressor runs for 45 mins and shuts off

This is on a 1997 Chevy C2500 with a 5.7L. It has a new AC compressor, AC condenser, AC Manifold hoses (suction and discharge). After an evacuate and recharge, the AC blows ice cold for about 45 mins (...
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0answers
257 views

A/C Air Recirculation

In my 2017 Toyota 4Runner I'm interested in a solution to keep recirculation on by pushing a button even when the defrosters are on. In other words, a wire to override the defrosters so recirculation ...
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1answer
2k views

AC clutch not engaging

I have a 2007 Honda Fit. Two summers ago, my AC stopped working. I brought it to a shop, where the compressor was replaced. This fixed the problem at first, but last summer the AC started working ...
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1answer
24 views

Is there any possibility to go with a/c compressor, repair/overhauling instead of moving with replacement

Is there any possibility to go with a/c compressor, repair/overhauling instead of moving with replacement. Then, what are the parts we can go ahead with change of parts of a compressor.
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2answers
4k views

Car AC sometime cold sometimes not

Recently I have noticed that the air from ac vents sometimes cold, but sometime less cool/fan mode for a while, before return to cold. I also noticed almost continuous "hissing" sound from around the ...
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0answers
33 views

No air-conditioning

If the AC was leaking and someone unhooked the AC unit, would that be causing the belt to squeak now? If so, what would you suggest?
2
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0answers
37 views

Chrysler Sebring 2007 Hvac

My Ride Chrysler Sebring 2007 Driving side AC is blowing hot air while passangr side is cold. Any theories?
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0answers
360 views

2007 Jeep commander, car blows hot (extremely) air

Had actuator as well as controll head replaced and car still blows hot air. When controls are in off position hot air will blow in. Turn ac on hot air still blows in. Been to two Jeep dealers and ...
4
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1answer
123 views

Is it bad to immediately crank the air conditioning all the way up when you start your car on a really hot day?

There have been times in the summer when my car is in my driveway all day in 100-degree weather, and combined with the sun, it must be 140+ degrees in my car. Can it damage or shorten the life of my ...
1
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1answer
677 views

Squeaking noise when I change the air flow mode

When I switch the air flow mode to or from "windshield", I can hear a creaking/squeaking noise coming from the windshield's defroster outlets. It only lasts a second, so I know it's coming from the ...
1
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1answer
1k views

What should a/c low side/high side pressures be after weeks of non-use?

I removed the compressor clutch relay last week when I began noticing severe engine bog when the compressor engages. I'm Hopeful that I can minimize further damage and salvage whatever I can. Now it's ...
3
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1answer
203 views

AC system automatically switching to hot defrost

In my 2009 Dodge Grand Caravan I recently had the AC compressor replaced. Since then, while running the AC the system will automatically and randomly switch to pushing hot air out of the defrost vent ...
2
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1answer
1k views

The heater fan not coming on in my hyundai accent. Car has no A/C option

No air coming out when I turn the heater on. Turn the fan switch on but no air coming out.
3
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1answer
2k views

why condenser is placed before the radiator?

i am confused why radiator is placed after the condenser in an automobile. what will happen if we place radiator before the condenser? whether it is related to design or temperature.
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2answers
665 views

New Evaporator has bent fins

I bought a new evaporator to replace my old leaky one. However it has some fins bent. Should I return the evaporator? Or should I try to get a new one? EDIT: I just figured out what happened, this ...
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2answers
417 views

What to replace with the evaporator core

I have a pretty big leak in my evaporator. I can hear a hissing sound when it's pumped with freons. So I'm going to replace it, along with the expansion valve and the receiver drier. It's quite a ...
1
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2answers
34 views

A/C not as effective when stopped

I purchased a 2010 Ford F-150 with the 4.6L motor. The AC seems to work fine, but only when I am moving. When the truck is moving above 30 mph it produces a relatively cool stream of air even if the ...
1
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2answers
94 views

Honda Cr-V AC Died

Recently my 2006 Honda Cr-V AC died - again. After researching I discovered I had "black death" where the whole AC system is infected with little black chips To judge by the number of upset owners ...
3
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2answers
1k views

2007 Pontiac g6 keeps blowing fuse

There's a fuse under my hood that controls the heat, ac, defroster etc. a couple months ago they all stopped working. I checked the fuse and alas it was blown. I've bought replacement fuses with the ...
1
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1answer
29 views

Mildew Scent in Car when Off

I have a 2012 Kia Sorento, which last year had an issue where the condensation drain line was stuck behind the exhaust manifold, causing the line to be pinched and condensate to accumulate to such a ...
1
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0answers
41 views

Are there any cars where the blower motor is controlled by switched mode power supply?

I have seen many questions here related to blower motor resistors. That sounds like a really old-fashioned kind of technology. This made me wonder whether there are any cars that would use a switched ...
1
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1answer
34 views

Is a positive multimeter measurement at the blower motor power connector sufficient to diagnose a failed blower?

Last week the A/C fans on my 2004 Honda Accord LX failed. It wasn't quite all at once... the fans kicked in once or twice after the initial failure, but cut out again after a couple of minutes. After ...
4
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2answers
1k views

Subaru Blitzen overheating but heater blows cold air

I have a 2000 Blitzen. My heater blows cold air and tonight it overheated. It is not losing water. Would this be the thermostat or an air blockage?
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2answers
84 views

Why doesn't my A/C blower motor have speeds anymore?

We have a 1997 Chevy Suburban. During the winter we were in Utah and our front blower motor started shrieking like a banshee, so we replaced it (it was very, very cold outside so not blowing hot was a ...
2
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0answers
146 views

Toyota Yaris 2010 A/c problem

I have a weird problem with the A/C on my Toyota Yaris 2010. The A/c takes time to cool after being in the sun for a long time, and when the A/c does cool somewhat, it starts behaving weird. When the ...
1
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1answer
6k views

New AC compressor - steps before turning it on?

I installed a new AC compressor on the Solstice of Sorrow the other day, but haven't turned it on yet. I'm planning on recharging the system this evening. Now, before I do this: am I supposed to oil ...
3
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2answers
3k views

AC compressor not staying engaged

I own a Mazda MX-5 NB (mk2). I just got it back from the workshop, as the AC compressor had to be replaced. Unfortunately I am noticing an odd behavior with it. Initially the compressor engages ...