How does your new Subaru's AC work?

46,835

Asked by Aug 21, 2015 at 09:42 PM about the 2015 Subaru Forester 2.5i Premium

Question type: Maintenance & Repair

My AC works fine on flat ground but when climbing hills it blows put hot air instead of
cold. Even accelerating on flat ground causes the air temperature to rise immediately.  
The more throttle you give it, the worse it gets.  Backing off on the gas causes the air
coming out of the vents to become cold again instantly.

This seems to be an engine vacuum related issue but so far my dealer has no answers.

16 Answers

17,650

Sounds like the A.C condenser coil is partially clogged with dirt and bugs. Sitting idling does not need much air flow but driving air flow is restricted. Clean coil and radiator with a garden hose and nozzle or better yet a pressure washer that will remove the dirt and bugs to get better air flow across the fins of the coil.

46,835

It is a brand new car and everything is clean. If there was poor air flow through the coil it would be worse at low speeds, not at higher speeds. A pressure washer is a bad idea because you might damage the AC coil.

46,835

My 2003 Subaru with 200,000 miles is a far superior car to my 2015 in nearly every way and the AC works like a Cadillac's!

17,650

Never would have recommended it if have not used pressure washer myself just use the fan spray tip not the full stream tip.

17,650

The only other thing is the in line filter on the high side line of the A/C system is partially clogged or the blend door is closing off between evaporator and heater core for some strange reason.

40,295

There is likely a defective vacuum hose that goes to the heater and air controls inside the vehicle. Inspect all the vacuum hoses for cracks and splits. When going up a hill the throttle is open more and the engine makes less vacuum. I suspect a blend door or something similar is moving due to lack of vacuum and redirecting the interior air flow. Also NEVER use a high pressure washer on the a/c condenser or radiator. The high pressure water can collapse the cooling fins and ruin these parts.

17,650

Hey Bob let me ask you a question have you tried a pressure washing or are you just thinking that would happen ? I am a person that is not afraid to think outside the box. Tried it and it works great.

40,295

I have actually collapsed cooling fins on a radiator. If you get too close the high pressure will flatten them immediately. Even a commercial car wash pressure wand will do this if the wand is held too close. If you are very careful and keep your distance a pressure washer can be used, but one of these things in the hands of the inexperienced will do damage. I actually have a 5 HP electric pressure washer here at the house. It blew some of the factory paint off of a mirror on my 2003 Mercury.

40,295

Firebird, re-read the OPs question. I think you might agree that he has a vacuum issue, "Backing off on the gas causes the air coming out of the vents to become cold again instantly" is the key to this. The word "instantly"! Likely a vacuum reservoir that has a hole in it or a bad vacuum hose that controls the HVAC.

40,295

I have this very same machine. http://www.northerntool.com/shop/tools/product_200347872_200347872

17,650

You are right Bob I agree as I said in one of my previous answers that the blend doors cable might have come off or a vacuum like you said depending on what kind of system that operates the blend door.

17,650

And as far as the pressure washer is concerned do not hold it that close and use the fan spray nozzle not the jet spray that nozzle will bend the fins if you hold it to close or even far away.

46,835

The problem is fairly obvious but my question is - is anyone else having this issue with their new Subaru? My dealer is trying to make it sound like this is somehow normal as they do with all problems.

160

The AC on the new subarus sucks. I have a 13 XV and on a hot day its a pretty miserable ride. Our 2nd car is a 2002 Focus and it has ice cold ac. We run the Focus ac on the lowest setting and the XV's on its highest.

1 out of 1 people think this is helpful.
10

The PCM disengages the compressor clutch at or near WOT for better acceleration. So at such times the air won't be cold, but it shouldn't be hot either.

1 out of 1 people think this is helpful.
20

The AC on my new 2016 Forester also sucks. I actually got the dealer to replace the whole unit and it made no difference. I have the same issue with it switching to warm air for no apparent reason.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Forester

Looking for a Used Forester in your area?

CarGurus has 22,781 nationwide Forester listings starting at $1,499.

ZIP:

Search Subaru Forester Questions

Subaru Forester Experts

#1 Nick Eidemiller
Nick Eidemiller
Reputation 3,510
#2 walth
walth
Reputation 2,830
#3 lifeson34
lifeson34
Reputation 2,460
View All

Related Models For Sale

Used Subaru Outback
300 Great Deals out of 29,744 listings starting at $1,200
Used Honda CR-V
811 Great Deals out of 59,372 listings starting at $1,200
Used Toyota RAV4
642 Great Deals out of 61,987 listings starting at $2,450
Used Subaru Impreza
176 Great Deals out of 13,341 listings starting at $1,817
Used Subaru Legacy
208 Great Deals out of 16,088 listings starting at $1,300
Used Subaru Crosstrek
20 Great Deals out of 11,000 listings starting at $19,900
Used Subaru Impreza WRX
37 Great Deals out of 1,139 listings starting at $1,500
Used Toyota 4Runner
315 Great Deals out of 20,549 listings starting at $2,295
Used Toyota Highlander
475 Great Deals out of 25,073 listings starting at $1,500
Used Ford Escape
1,116 Great Deals out of 90,856 listings starting at $1,295
Used Mazda CX-5
145 Great Deals out of 24,502 listings starting at $7,963
Used Subaru XV Crosstrek
61 Great Deals out of 2,143 listings starting at $8,950
Used Nissan Rogue
561 Great Deals out of 75,583 listings starting at $3,495
Used Toyota Tacoma
619 Great Deals out of 35,127 listings starting at $2,155
Used Subaru Impreza WRX STi
29 Great Deals out of 584 listings starting at $9,000

Used Cars For Sale

2017 Subaru Forester 2.5i Premium For Sale
5,919 listings starting at $23,498
2016 Subaru Forester 2.5i Premium For Sale
34 Great Deals out of 850 listings starting at $19,691
2015 Subaru Forester 2.5i Premium For Sale
44 Great Deals out of 896 listings starting at $13,995
2014 Subaru Forester 2.5i Premium For Sale
17 Great Deals out of 608 listings starting at $10,500