Questions tagged [hvac]

HVAC - Heating, Ventilation, Air Conditioning.

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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 ...
jsstuball's user avatar
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1 answer
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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 ...
Sam7919's user avatar
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194 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 ...
tuskiomi's user avatar
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4 votes
2 answers
727 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 ...
Enigma's user avatar
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2 votes
1 answer
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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 (...
HumanJHawkins's user avatar
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180 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 ...
Curious Cookie 's user avatar
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1 answer
453 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?
user25963's user avatar
1 vote
2 answers
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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 ...
example6's user avatar
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124 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 ...
goodcat's user avatar
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111 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)....
lly's user avatar
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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 ...
1.21 gigawatts's user avatar
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467 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 ...
Aurelien's user avatar
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1 answer
835 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 ...
Roland's user avatar
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2 votes
1 answer
987 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 ...
JohnUbuntu's user avatar
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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 ...
Anthony w's user avatar
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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 ...
Paul D's user avatar
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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 ...
Rod's user avatar
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269 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 ...
Jupiter's user avatar
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1 answer
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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 ...
WhiplashGamz's user avatar
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1 answer
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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 ...
Adam lavers's user avatar
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29 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 ...
dotancohen's user avatar
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8 votes
2 answers
2k 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,...
Alex Estrada's user avatar
1 vote
1 answer
901 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 ...
charlie's user avatar
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1 answer
114 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 ...
Zerjack's user avatar
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370 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 ...
tealsuki's user avatar
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0 answers
58 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 ...
Oscar's user avatar
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0 answers
60 views

Automotive AC Diagnosis Chart / Resources

Has anyone found a good automotive AC diagnosis chart? I can find some suggesting pressure ranges, and even temperature and pressure ranges, but I cannot find a good source which also includes ...
mongo's user avatar
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0 votes
1 answer
277 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 ...
AaronD's user avatar
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1 answer
38 views

Air control system in cabin

2016 Air distribution functions fine on passenger side. Drivers side only blows hot air. Have not tried anything yet. Want to make sure I am looking at correct component.
Jeff Clark's user avatar
1 vote
1 answer
68 views

What happens if the AC evaporator ices over?

I am thinking of replacing the air conditioning evaporator temperature sensor in my 2011 ford fusion with a resistor, since the dash must be removed to replace the sensor. The warning that goes with ...
Oscar's user avatar
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1 vote
0 answers
1k views

Bizarre Lack of Heat From Heater Vents - 2010 BMW E91 318d

I have an issue I'm struggling to pin down with my 2010 318d 3 Series Touring: All air vents blow cold or at best, luke warm air into the passenger compartment, even on long journeys when the vehicle ...
Phil's user avatar
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1 vote
0 answers
702 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 ...
jwh20's user avatar
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0 votes
1 answer
107 views

Why does the car heating system won't start for the first 15-20 minutes of driving in the winter?

My car heating system does not start for the first 15-20 minutes of driving in the winter. It happens all the time, no exception. The colder outside the longer it takes to start working. After 15-20 ...
Mamun's user avatar
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0 votes
1 answer
52 views

Is it ok to wipe down hvac intern aka with white vinegar/bleach? [duplicate]

I am going to be cleaning inside the scuttle panel and taking the my HVAC system apart to clean inside it. Is it ok to mix white vinegar or bleach/Dettol(similar to Lysol cleaner marketed in the USA) ...
James Wilson's user avatar
  • 2,736
5 votes
3 answers
2k views

How do race drivers clear foggy windscreens?

I know that, in order to decrease weight, race cars may remove AC and heating systems as these are not essential. However, when driving, if their windows get foggy due to cold weather, how do they ...
James Wilson's user avatar
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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?
Lawyer Aidroos's user avatar
1 vote
0 answers
56 views

2011 Prius AC job

2011 Toyota Prius AC Job Never done one, any tips on how complicated it is. Evidently the compressor is an electric unit? I know the basics but do not have a charge machine, so its old school for me ...
Moab's user avatar
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0 votes
1 answer
43 views

HVAC Flow Control - A/C Won't Blow Through Dash Only

In my 2010 Mazda 3, the switch that adjusts the flow control works generally, but when I adjust it to blow only through the dash vents, it still blows primarily at the feet (the adjacent setting) and ...
Tahlor's user avatar
  • 213
0 votes
2 answers
46 views

HVAC clutch cycle

2007 3.0R Subaru Outback - the hot & cold climate air work OK. I've checked the clutch gap which is within the tolerance specified by the factory service manual. Often when climate temperature ...
ajayel's user avatar
  • 474
1 vote
1 answer
92 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 ...
Jon Eddy's user avatar
-1 votes
1 answer
133 views

If I go in and remove car evaporator, does that mean I will no longer be getting any smell problems?

Despite using ac cleaners car smell keeps coming back. Even if you use something like kool-it you can still expect it to return. The only way to remove the problem is get to the source and clean\...
James Wilson's user avatar
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0 votes
2 answers
681 views

2006 Ford XLT Front Dash Vent Door plastic lever broken that was attached to the Mode Actuator (which works)

2006 Ford Explorer XLT. Got a loud snap sound with small piece bouncing around under dash on passenger side. Air flow changed to def and floor only. Searched online, pulled glove box, Front vent ...
Gadget's user avatar
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1 vote
0 answers
27 views

Squeak when changing to face or defrost

Good afternoon I had a squeak that would happen when I turned my air to the face vent it would only squeak at the very end of the actuator cycle. Here is a link to the video of that https://youtu.be/...
Daniel2011's user avatar
2 votes
1 answer
37 views

HVAC not providing heat in the vehicle

I have a Vauxhall Insignia. I've had the waterpump, thermostat, and housing replaced. It's still not getting hot air in the car. Also, had 2 sniff tests done and compression tests done, both passed? ...
colin barfoot's user avatar
1 vote
1 answer
160 views

2014 CX-5 hot air - possible overheating?

Hopefully someone can shed some light into what's going on. For the last couple of days we have been in a cold snap around -30C. I was driving the car and noticed that the ambient (outdoor) ...
ottguy's user avatar
  • 13
1 vote
1 answer
67 views

heater is cold until I hear a noise and heat starts immediately

I think the answer to this is easy but I'm not sure of the part name. I'm driving along and have the heater on, but it's blowing cold air. Then I hear kind of a "clackety clack", and then the air ...
Oliver Williams's user avatar
0 votes
0 answers
24 views

2002 Toyota 4Runner intermittent HVAC issue

2002 Toyota 4Runner intermittently starts blowing hot air no matter where temp setting is at. Fiddling with temperature knob resolves issue.
Jay's user avatar
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0 votes
1 answer
120 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 ...
discord's user avatar
-1 votes
1 answer
61 views

When spraying anti bacterial agent into the Ac, do you need to remove your pollen filter?

The pollen filter maybe at front of or behind blower motor. I have been watching videos on clearing ac smells and some show that you should remove the pollen filter and spray directly onto the blue ...
James Wilson's user avatar
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0 votes
1 answer
59 views

If ac gives rotten egg smell, does that mean there is an animal in the system?

I have just read that if you’d ac is giving a rotten egg smell, it’s probably because an animal has climbed in and died in the vents. Is it true and if so, I guess just spraying with lycos isn’t ...
James Wilson's user avatar
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