Air Condition Problem

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Brett E., Mar 11, 2013.

  1. Brett E.

    Brett E. New Member

    Joined:
    Mar 8, 2013
    5
    0
    0
    Vehicle:
    2004 Prius
    Model:
    N/A
    My Prius air condition blows hot air sometimes, sometimes it works fine, warm weather seems to increase the problem. Took it to the dealer, they couldn't duplicate problem, said it was fine, but it is obviously not. Where should I start, don't like the replace parts till we figure it out thing. Don't think its the compressor b/c sometimes it works, sometimes it doesn't. Fan is working fine. Any suggestions?
     
  2. nh7o

    nh7o Off grid since 1980

    Joined:
    Dec 10, 2011
    1,686
    323
    0
    Location:
    Hawaii
    Vehicle:
    2009 Prius
    Model:
    II
  3. Brett E.

    Brett E. New Member

    Joined:
    Mar 8, 2013
    5
    0
    0
    Vehicle:
    2004 Prius
    Model:
    N/A
  4. nh7o

    nh7o Off grid since 1980

    Joined:
    Dec 10, 2011
    1,686
    323
    0
    Location:
    Hawaii
    Vehicle:
    2009 Prius
    Model:
    II
    Many do respond with results, although certainly more could. Many of the issues tend to cluster around certain themes, so that over time the causes become clear. However, A/C tends to be Terra incognito to many DIY's.
     
  5. lech auto air conditionin

    Joined:
    Sep 5, 2011
    308
    187
    187
    Location:
    san francisco
    Vehicle:
    2012 Prius c
    Model:
    Two
    Unfortunately A/C not always that cut and dry. Many times it starts out with a minor underlying problem and is not noticed or the repair is put off for some time, then that will cause another problem that the owner can not ignore but buy that time it it may be expensive to fix. By this time it now has multiple problems to diagnose with one problem masking another.
    1: it is a 2004, you did not state if the a/c has been recharged lately. If not did any one bother to suggest that after 9 years it just may be time. The sight glass is not always accurate if nearly never!. My photo album my guide you a little as what to look for as easy to see leaks. There are vary few shop that really know air conditioning and even fewer that know Prius a/c and the new hybirds A/C system. If you are in the San Francisco area I could suggest a shop.
     
  6. 3prongpaul

    3prongpaul Hybrid Shop Owner, worked on 100's of Prius's

    Joined:
    Jul 18, 2010
    922
    660
    1
    Location:
    Boulder Hybids, Boulder, CO
    Vehicle:
    2006 Prius
    Model:
    N/A
    And make sure whoever "recharges" your AC system has the correct Hybrid compatible AC equipment. They need to use ND11 compressor oil or they could destroy your HV electric compressor.
     
    Fern1461 likes this.
  7. lech auto air conditionin

    Joined:
    Sep 5, 2011
    308
    187
    187
    Location:
    san francisco
    Vehicle:
    2012 Prius c
    Model:
    Two
    Air Conditioning Maintenance and Problems | PriusChat

    HVAC, tools, a/c 101, tips, procedures, test | PriusChat

    A/C Compressors non-Prius. A look at their complexity, just a few of many. | PriusChat

    prius compressor after body shop serviced a/c | PriusChat

    thees 4 links go to my photo albums about Prius air conditioning, im not finished with them, have much more to add. Little word of advice. Only go to a shop that has a( TOYOTA TECH STREAM SCAN TOOL ) this is a absolute must, 2ed I list what a shop repairing air conditioning should have both to properly diagnose your car and some tools are by LAW from the EPA in my photo albums. good luck
     
    Fern1461 likes this.
  8. janders

    janders Junior Member

    Joined:
    Jan 21, 2010
    23
    3
    7
    Location:
    SF Bay Area
    Vehicle:
    2006 Prius
    Model:
    N/A
    I'm in the SF area, what shop would you suggest?
     
  9. Britprius

    Britprius Senior Member

    Joined:
    Jun 14, 2010
    5,194
    1,827
    0
    Location:
    Herefordshire England
    Vehicle:
    2008 Prius
    Has the car ever been in a front end accident?

    If so turn on aircon and stand at the front of the car. Do you feel air blowing out of the front grill, if the answer is yes the two cooling fans have been put on in the wrong possitions, "they counter rotate".

    The fan blades must be taken off (not the motors) and exchanged with each other, they will then blow air in the correct direction. Another clue to this is the outside air temp reading on the mfd does not show correct temperature.

    John (Britprius)
     
  10. lech auto air conditionin

    Joined:
    Sep 5, 2011
    308
    187
    187
    Location:
    san francisco
    Vehicle:
    2012 Prius c
    Model:
    Two
    Janders your in luck to be close to Luscious Garage 475 9th st. SF Luscious Garage | Hybrid Specialists
    its difficult to diagnosis a A/C problem on a cold day so it is best on warmer days 70F it can be done cooler if the problem is real obvious. Lately here in SF the days have been only 49F to 62F . Important to tell the service writer if your car has been in a front end accident? did someone try to recharge your a/c before? Was it a body shop that recharged the a/c :( or DIY? How long have you had the problem? is it intermittent or constant? If it was charged before with the little cans from a auto parts store did it contain LEAK SEALER? + OIL + any other ADDITIVE that dose not belong in a Prius A/C system:cry:? . There is a PLAGUE :sick: of bad Body Shops and unqualified Auto Repair Shops preforming A/C recharge and repair work causing poor performance and burning up Prius A/C compressors. I just got another car today from a body shop today and nearly every other day. Most causes by adding too mush refrigerant, too little refrigerant, too much oil, no oil added after replacing a condenser, wrong oil, PAG OIL, high moisture content contaminated refrigerant, Air % mixed with the refrigerant, and the list goes on!.

    good luck, Tom from Lech Auto Air Conditioning
     
    Mike500 likes this.
  11. creature0077

    creature0077 Junior Member

    Joined:
    Jun 26, 2009
    41
    3
    0
    Location:
    Austin, Tx
    Vehicle:
    2005 Prius
    Model:
    II
    I've noticed my Prius has kinda an intermittent issue with the AC. I don't normally use the AC because I like driving with the windows down in this Texas weather. Well last night, my girlfriend and I were "talking" in the car with the AC running while it was parked. It just refused to get cold even at Max Cold.

    Pulled out my shop manual for the Prius and went through the trouble shoot section of the Heater & AC portion. Didn't help much with the air bubble. The bubble was slightly visible before starting the car, after running it the bubble was gone completely and didn't come back when turned off. But, the AC got pretty cold during that time.
    I had a front end collision before and had the bumper and radiator fixed, I didn't check to see if the radiator for the AC was replaced and I don't remember seeing any work order for AC components or fluids. Fans are blowing in the right direction (into the engine). There is a huge temperature difference between the input and output of the coolant flowing through the radiator.

    Perhaps I have a faulty temperature sensor? That seems to be the only thing that makes sense unless I somehow have an excessive amount of refrigerant but I'll need to check that with a manifold gauge.

    Any suggestions what to do next? Check pressures or somehow check other stuff?
     
  12. nh7o

    nh7o Off grid since 1980

    Joined:
    Dec 10, 2011
    1,686
    323
    0
    Location:
    Hawaii
    Vehicle:
    2009 Prius
    Model:
    II
    Make sure that the radiator fans are blowing the proper direction. If the repair place reversed the fans, the air blows out, rather than in.
     
  13. creature0077

    creature0077 Junior Member

    Joined:
    Jun 26, 2009
    41
    3
    0
    Location:
    Austin, Tx
    Vehicle:
    2005 Prius
    Model:
    II
    Already checked that. The problem is intermittent because sometimes when it's parked it works perfectly fine, and at other times it seems like it's not getting very cold.
     
  14. we6a123

    we6a123 Junior Member

    Joined:
    Apr 4, 2015
    8
    0
    0
    Location:
    Los Angeles
    Vehicle:
    2006 Prius
    Model:
    Four
    I am having a similar problem. The fan will not switch into high speed, so the A/C turns off at a stop light or in traffic. Do you know where the temperature sensor is and can I replace it?
     
  15. Mike500

    Mike500 Senior Member

    Joined:
    Mar 1, 2012
    2,593
    742
    0
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    "Beyond these boundaries, there will be dragons." :eek::confused::cry:

    Not really. I installed and aftermarket one in my first car when I was 19 in 1970. I bought one of those Comfy Kits out of an ad in Popular Mechanics.

    The fan is wired to a connector block. You can reverse it, unless you've cut into the wiring harness.
     
    #15 Mike500, Apr 4, 2015
    Last edited by a moderator: Apr 5, 2015
Loading...