Jump to content

A/C Issue

Jansen

Recommended Posts

Jansen Enthusiast

Jansen

Posted
Posted

95F in Ohio today and the A/C wouldn't go lower than 70F. Yesterday, when it was 92F it was blowing around 49F. The dealer has recharged the system once. I"m about out of warranty, and it is two weeks before I can get it in again. Is there anything I can check to get a feel for what the issue is and prevent the dealership from screwing me? The right two vents (passenger) always run wamer than the driverside. Manual temp controls.

 

Jansen

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

If you have a low side pressure gauge (~$20 at Wal-Mart) you can tell us the static pressure in the system with the engine cold, the ambient outside temp., and operating pressure range with the engine running.

 

Is your clutch cycling every few seconds?

 

DEWFPO

Jansen Enthusiast

Jansen

Posted
  • Author
Posted

Ok, tonight I went to the gym and the a/c was pumping out 46F air. I'm a little confused. Since last summer the driver side was a constant 49F, the passenger 52F. Now the driver side would go not colder than 70F earlier today then 46F. What is causing the fluctuations?

 

Jansen.

 

I checked and the clutches are not cycling faster than they used to.

ken1mod Senior Enthusiast

ken1mod

Posted
Posted

humidity is the same as heat to an a/c. it is called latent(hidden) heat.

 

If your unit blows 46 degree air at idle, you are on spec. if it is very humid it might be a bit higher.

 

To really check, see if the accumulator is cold. if it or the line from the evaporator to it (firewall side) is cold, you are great.

 

If the a/c is condensing lots of water and dripping under the car, the unit is working great.

 

If you are comfortable after a few minutes of cruising, the unit is working great.

 

Lots of people look for trouble with a/c units that are really fine. The main concept to look for is accumulator temp. if it is cold, you are ok. adding refrigerant to a properly charged unit will raise all temperatures.

 

Ken :D

Jansen Enthusiast

Jansen

Posted
  • Author
Posted

I don't know then. Today after work it was back between 60F and 70F at idle with outside temps between 92F-95F. I popped the hood and saw condesation on the lines. I'll check tomorrow to see if the line is cool coming into the firewall.

 

Jansen

KICK Enthusiast

KICK

Posted
Posted
I don't know then.  Today after work it was back between 60F and 70F at idle with outside temps between 92F-95F.  I popped the hood and saw condesation on the lines.  I'll check tomorrow to see if the line is cool coming into the firewall.

 

Jansen

 

 

 

 

 

does yer fan clutch work??

 

Automotive AC needs good air flow across condenser, for instance does it work better when your driving down the hiway but outlet temperature warms up when your idling.

 

 

is it a 134 A system?? these are even more sensitive to air flow across condenser and work better with good air flow and higher compressor speeds.

 

you have to give an a/c system time to stabilize, like any other mechanical device it warms up and becomes more efficient after it has been running for 10 or 15 minutes. Its unreasonable to expect an ac system to blow ice cold air when its more than 100 degrees inside a vehicle thats been sitting out in the summer sun and all the interior parts are that temperature,you could have a 35 degree evaporator but by the time that air is distributed thru the 130 degree plenum and ductwork its going to warm up. that AC unit has to absorb all the interior heat in that vehicle and move it outside before it will start to cool off the vehicle.

 

so you

gotta give it a chance, it might be working as good as it ever will.

  • 2 weeks later...
Jansen Enthusiast

Jansen

Posted
  • Author
Posted

Guess who is getting a new A/C compressor.......ME! Dealership called me yesterday and said they had a loaner waiting for me and that I can expect the truck back on Monday.

 

Mixed feelings on this one though. It's Good that the dealership found the problem, but it adds to a long list of issues with this truck. With so many issues before the warranty perioud is up (33,000 miles now), I'm scared to think of what this truck will cost me, good to know that it was made in the U.S.A. I hear the Japanese brands calling, considerin toyota and nissan make theirs in the U.S.A.

too.

 

I'm going to draft a letter with all the issues that needed fixed (2nd time for A/C) and ask GM to provide and extended warranty. I have around 15 items fixed now in 19months of ownership. That amounts to approximately 18 days with out my truck. If they don't do something for me, I'm going to send them a picture of my new Toyota.

 

 

Jansen

OUMike Senior Enthusiast

OUMike

Posted
Posted
humidity is the same as heat to an a/c.  it is called latent(hidden) heat.

 

If your unit blows 46 degree air at idle, you are on spec.  if it is very humid it might be a bit higher.

 

To really check, see if the accumulator is cold.  if it or the line from the evaporator to it (firewall side) is cold, you are great.

 

If the a/c is condensing lots of water and dripping under the car, the unit is working great.

 

If you are comfortable after a few minutes of cruising, the unit is working great.

 

Lots of people look for trouble with a/c units that are really fine.  The main concept to look for is accumulator temp.  if it is cold, you are ok.  adding refrigerant to a properly charged unit will raise all temperatures.

 

Ken :cheers:

 

 

 

 

I dunno. I'd get it checked. My unit blows in the 50s regaurdless of heat, humidity ect. I live in Houston, so lots of both. In mild humidity and low 90s will get into mid 40s.

mcreyaufmiller Senior Enthusiast

mcreyaufmiller

Posted
Posted

I do not feel like they would give you an extended warranty. I have a 98 with 170k on it and no real problems at all (until it started oil fouling the #6 plug), but I was ready to put a new motor in anyway. They will tell you something like they have lived up to the warranty promised when you bought the truck, but in my expirence, I have not seen many vehicles have a whole lot of problems once they get out of warranty.

Jansen Enthusiast

Jansen

Posted
  • Author
Posted

I don't know. My uncle has a 91 reg cab,8ft bed with 4.3LV6 and was at or over 250,000 miles before it was wrecked. I look at mine and there is no way I'm going to get that. It bothers me that I've had all these issues and, as if I didn't pay enough already, in a few short miles I've got to pay for repairs that are from bad builds.

 

Oh well.

 

 

Jansen

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    343,007
    Total Members
    8,960
    Most Online
    Brendan C
    Newest Member
    Brendan C
    Joined

  • Who's Online   2 Members, 0 Anonymous, 1,155 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      Joke Thread

      By Grumpy Bear · Posted

    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You're better read than that Atlas. 😏   British science fiction writer Arthur C. Clarke formulated three adages that are known as Clarke's three laws, of which the third law – that "any sufficiently advanced technology is indistinguishable from magic" – is the best known and most widely cited.   Stribeck and the pivotable Hersey Number isn't voodoo nor snake oil. That part is physics. It's what marketing and bean counters do with it that is snake oil and voodoo.    Stribeck is the relationship between Hersey and the Coefficient of Friction. Within the Hersey Equation if viscosity and viscosity is 'Dependent' on.......heat.......and.......viscosity index or the temperature to viscosity slope.    Specifically Hersey is the viscosity AT THE TEMPERATURE IN THAT LOCATION FOR THAT SLOPE.   Hydrodynamic lubrication exist when the film thickness in the location is 3X the Ra roughness of the surface. This is irrespective of the hardness of the substrate. To obtain that thickness X viscosity is required for Y velocity at Z load. That's a lot of moving parts. It is also impossible to maintain in an ICE but nearly possible with a turbine under constant load.    What does that mean? Error heavy and operate light. Wear is inevitable but the rate of wear and the milage obtainable are a function of prevailing conditions and HABITS. The only penalty is viscous drag and at fractions so low as to be well worth the effort. Double the life, half the manufacturing carbon foot print. Greed is the only impediment.    The materials generated by SwRI are the RESULT not an estimation or a hypothesis.    Don't delude yourself sir, EV's have as many pitfalls as ICE's. We just don't know what they are yet and it will take longer to sort as MARKETING and GREEDY CEO's have had more time to polish the turd they are selling. 
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You can always count on greed to prey on ignorance and stupidity.    Friend bought a 2019 Ford Flex and asked me about using Valvoline R&P 5W30 in it. Told him give the miles on it and the fact it wasn't yet using oil that it was a good plan. He uses a Valvoline quick change shop for his oil service.   First they tell him that isn't the oil the OEM recommends. He told them he didn't care what the OEM thought. Then they floated the, "But it will void your warranty"    His reply was it's a 2019, there is no warranty and informed them their knowledge of the law was lacking.    Then they tell him 'But it will ruin your motor"!.    Mine to ruin he says. Finally they give in and charge him 150% the semi-syn price    Point it the brainwash is so embedded that even the service industry is drunk on their swill. The public is right behind them. Echoing the same lies on every forum and media platform. If the end goal is indeed EV then I'd say that ship is about built. 
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Diesel hit $6.00 here today at the truck stop.   Payed $2.79 for E85 today too.
    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...