Skip to main content

Questions tagged [hvac]

HVAC - Heating, Ventilation, Air Conditioning.

Filter by
Sorted by
Tagged with
1 vote
1 answer
38 views

HVAC system shuts off when fan on MAX and engine ON

2009 Toyota Venza Recently noticed that when the front defrost mode is select (which sets fan to max and directs air to the windshield), the entire HVAC system shuts off (i.e. blower motor stopped, ...
0 votes
1 answer
91 views

When you HVAC fan on with AC and heat off, does it go past evaporator?

If you switch AC and heating off but put fan on, does it mean clean air gets pulled and put in cabin while staying separate from the evaporator? Or does this air pass by the evaporator then go into ...
5 votes
1 answer
10k views

2006 Jeep Liberty - AC clutch won't engage

The AC clutch on my Jeep Liberty 2006 won't engage. Here is what I have checked so far. Fuse 14 in the passenger cabin 21 in the engine compartment are ok AC relay ok When I jump the AC relay I ...
0 votes
1 answer
126 views

Can I get a HVAC diagram that shows vent locations and components for 2005 Ford Freestar

I have a 2005 Ford Freestar that has floor and ceiling vents in the back of the cab. I'm interested in installing a 3rd party external heater and would like to see the ventilation routings to ...
0 votes
1 answer
111 views

Citreon C4 Grand Picasso HVAC inoperative

I havent driven my C4 since before Christmas but ive been starting it regularly and keeping it snow free. Just started it again but the air con and demister isn't working. Could it be frozen?
0 votes
2 answers
81 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 ...
0 votes
1 answer
1k views

Cool Ventilated and heated seats, can both options be used at once?

In our S 350, both can be turned 'on' at the same time in the front and rear seats. Now is it that going to mess up the fan motor?
5 votes
1 answer
138 views

What's this strangely marked control on my Eclipse?

My 1995 Mitsubishi Eclipse, and presumably other Mitsubishis of the same era, has a control over by the rear windshield wiper control, near the center vents. It's got 2 pictures of a person sitting. ...
3 votes
1 answer
553 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 ...
0 votes
0 answers
18 views

Coolant leak / engine overheat / cylinder misfire

Make: Honda Model: Civic 1.8L 2007 petrol Miles: 107,000 I have experienced cold air coming from heating system for a while - I probably should have addressed this sooner. Finally when driving ...
0 votes
2 answers
944 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 ...
5 votes
2 answers
655 views

Clunking noise from dash of 2005 Ford Explorer

All of a sudden there is a loud clunking noise coming from the dash of my 2005 Ford Explorer. Observations It definitely sounds cyclical. Exists only when climate control system is ON. Sound ...
0 votes
1 answer
126 views

1989 Chevrolet S10 Blazer AC issue

I have a 1989 S10 Blazer with a 4.3 L V6 engine. It has an AC that is giving me some trouble. Observed Behavior: When i slide the mode selector to any AC mode , it blows the ac fuse. Ive replaced the ...
-1 votes
1 answer
3k 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 ...
1 vote
1 answer
93 views

Was charging the a/c and the pump engaged but just warm air came out

Put a vacuum to the a/c then charged it. It took 1.5 of the 2.5lbs it calls for and so I fired it up and turned on the a/c. The pump engaged but the air was still warm and the pump got real hot, too ...
2 votes
3 answers
31k 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 ...
1 vote
1 answer
8k views

Can I vacuum a/c system from low side only

I have a 90 suburban the Schrader valve in the high side is non removable and the line is discontinued. Napa can make a new hose with out valve. Can I vacuum from just low side?
1 vote
1 answer
36 views

What is the common name for a ventilated driver seat providing a cool-or-warm air draft?

I recently drove a car with the nicest feature I've seen in a car in recent memory: a gentle air draft from micro holes is directed at the back of the driver. If, like me, you've had your share of ...
0 votes
1 answer
310 views

A/C: Why does the LOW-side pressure *increase* when the compressor runs?

My heater badly needed replacement (leaking a fine mist of coolant inside the cabin), the A/C hadn't held a charge for years, and they're both in the same box that's a pain to get to and you have to ...
0 votes
0 answers
221 views

2017 Ford explorer HVAC blower motor will occasionally start when the motor starts however will turn off shortly after

I have a 2017 Ford explorer which has an intermittent issue with the blower motor. About 95% of the time when starting up the car, the blower motor will not start at all and will not respond to any ...
0 votes
4 answers
11k 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 ...
4 votes
2 answers
996 views

AC stops blowing air after a period of time

After leaving the car off for a few hours, and starting it up, the AC always works 100%, the fans blow very nice cold air and it can last 20+ minutes. Sometimes it never stops working fully (yay) but ...
1 vote
0 answers
739 views

2008 Mini Cooper S (R56) A/C compressor won't run

I've been in the process of putting my 2008 R56 Mini back together after replacing the timing chain, vacuum pump, turbo oil lines, and oil filter housing gaskets. If you've worked on one of these you ...
2 votes
1 answer
34 views

1997 Toyota Corolla, Hot Air Blowing into Cabin (non-AC model)

We have a base model (no AC, no options) manual 1997 Toyota Corolla that we are trying to keep alive long enough to teach the kids how to drive with a clutch. Whenever there is airflow into the cabin (...
1 vote
0 answers
196 views

Sixth Generation Toyota Camry - HVAC Defrost Mode Actuator Installation Instructions Needed

I am working on my car, which is a sixth generation Toyota Camry. She's been great to me..so far. Mine in particular is a 2008. The issue pertains to the HVAC system. While hot (and cold) air does ...
1 vote
1 answer
507 views

Lexus RX 3500 2007 wet floor driver’s side

The floor in my Lexus RX 3500 2007 is very wet for some reason (on the picture it’s already dry). Does anybody know what could be a reason?
1 vote
0 answers
184 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 ...
1 vote
2 answers
303 views

Does my refrigerant recovery machine have a leak if the vacuum is lost over several hours?

I'm attempting to do some DIY car repairs from my driveway, and need to remove the vehicle's AC condenser. To do so, I need to evacuate the r134a refrigerant from the AC system. Apparently it is the ...
0 votes
1 answer
49 views

AC starts cold, then becomes warm

2006 Ford Mustang - Ok so I've replaced the compressor clutch and accumulator. Every time the ac starts to blow cold the cooling fans turn on at the radiator and I can hear a click and the cooling ...
2 votes
1 answer
124 views

What's going on with the "temperature" part of this pressure gauge?

Ok, I think I finally understand the pressure bit of this gauge that came with this set of poorly documented hoses I got off Amazon. From 0 to 350, it's actually measuring pounds per square inch (PSI)....
1 vote
1 answer
575 views

Help to diagnose A/C failure? Ford Tourneo with Forscan OBD

The A/C in my car doesn't work, before any repair, I try to understand which part in the A/C system is the problem. Here the symptoms: Everything looks fine: no error message, the interior ...
0 votes
0 answers
21 views

Top fans not working bottom floor fans working

Recently in a Honda CR-V 2011 the top fans stopped working but the floor fans are working. I’ve checked under the hood and both fans are running. It seems like changing the ac control options on the ...
2 votes
1 answer
873 views

No air coming from footwell vents. VW Passat

I'm facing a problem where no matter what button I press I can't get any air to go to the floor vents. Whenever I press the according button air starts coming from the middle vents that's above the ...
0 votes
1 answer
120 views

Clicking sound on left side of dash possibly related to AC

So I got a new car some weeks ago. It's a Renault/Dacia Duster 2021. During the past week I took it on a long trip and reached the first 1000 km. During that trip I started noticing a clicking sound ...
2 votes
1 answer
1k views

Mercedes C200 (W204) air con not heating/cooling

I've got a Mercedes C200 (W204) from 2011 (facelift model) with a working air con (air blows out) but not getting cold or hot. I've taken it to a local mechanic that in less than 1h diagnosed it as a ...
1 vote
0 answers
129 views

09 ford flex A/C is blowing warm, Compressor clicking on and runny,pressure on low side well over 100

AC worked fine find about a week ago and then just stop stop working, got a couple of cans of freon and Hooked up the connection and the pressure was showing very high very high almost to the top ...
1 vote
1 answer
129 views

2017 Kia Sorento Dual Climate - how is it suppose to work

When I start my AC on low for both sides, air is blowing cold as expected. When I turn driver side up to say 72 degrees, it seems like the passenger side gets a little warmer but I don't think 72 ...
1 vote
0 answers
330 views

A.C. compressor doesn't turn on

2011 Ford Escape 3.0 FWD. System has charge, no leaks, new expansion valve. Compressor fuse was removed. When turning on the AC. The fan did not kick on and compressor did not activate. Both fans ...
0 votes
1 answer
57 views

Abnormal Fan Switch Voltages?!? '99 Wrangler SE/TJ fan issues

So I've managed to get the blower motor out of my jeep, and while I'm gonna try to salvage the seemingly spent motor (more about this in a different question), the voltage being sent to the motor ...
0 votes
1 answer
22 views

My Ac starts fine everyday runs cold for 40mins then goes into intermittent mode

Hi I have a 2012 VW Passat that has a faulty Ac it will run perfect first time you start the vehicle Ac will run cold for 40mins then suddenly it goes warm will come back on for a few mins then warm ...
3 votes
2 answers
7k 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.
0 votes
0 answers
30 views

AC cools middle vents, remaining vents receive airflow but it is not cooled

In a 2015 Subaru Impreza, when the A/C compressor is powered on, the two middle vents blow air that was obviously cooled. However, the remaining vents (one on dashboard near drivers' door, one on ...
8 votes
2 answers
3k views

Vehicle AC works initially, but after driving for a while (hour+), the airflow drops to the point being ineffective

I have a 2004 Ford Excursion with the 6.0 powerstroke. Most the time, the AC works fine, but after a long drive in hot weather, the front AC barely blows out of the vents. The rear works fine, in fact,...
9 votes
3 answers
7k views

how can I quiet a 'chirping' ventilation fan motor blade?

I have a 2006 VW Golf and the internal fan motor that blows the a/c & heat will start to 'chirp' (sound something like a bird singing) randomly. I believe the fan blade needs to be lubricated, ...
3 votes
2 answers
3k 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 vote
1 answer
1k views

Is my car ac condenser clogged?

I hosed down the condenser in my car today to see if it improves my ac What I realized is that the water didn't dry on some certain spots like the rest of the condenser. The top and the sides were ...
0 votes
1 answer
87 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 ...
0 votes
0 answers
382 views

Can I apply dielectric grease to a blower motor resistor body?

I have a 2001 Camry (North America model) which (in)famously puts the open-body blower resistor in the ducting to cool it, which leads to enormous corrosion and burnout problems in humid/salty ...
1 vote
1 answer
2k views

2008 Ford escape hybrid blend door actuator

I have a similar issue, my 2008 ford escape hybrid driver side remains on cold and my passenger side climate control works fine, no problems. I also notice that when I turn the knob on the driver side ...
0 votes
0 answers
63 views

Low pressure port on AC system read too high; compressor won't come on

my AC on a 2000 Nissan frontier has excessive pressure on the low pressure side . The compressor is also not coming on. Is there a high pressure switch that comes on the cuts power to the compressor ...