what should the temp coming out of the dash vents be? is 42 degrees acceptable on an 05? havent worked on any a/c since r12 has not been used. so its been a few years but it was always possible to get it lower than that.

reason i ask is my truck was blowing hot air when the auto climate control was set at 70 and then down as low as 60. i have been noticing a "growling" sound when going from full hot to full cold or when i start the truck. took the truck into the dealer this morning and they just called with its working normally!

 

well, i picked the truck up. in the lot it was blowing cool to warm. ran the temp up and down and the noise they could not hear was there like it was when i dropped it off. drove home got a digital gauge and with it full cold it measured 67 degrees. tried for the noise again and it still makes it.

this is on top of having to get the truck in at 0700 and then when i had not heard anything by 1300 i called and they had not looked at it yet.

I HATE DEALERS

 

In my '06, the "growling" sound was the blend doors creaking. Dealer took the dash apart and lubed the hinges. Has not made the sound since.

 

thanks for the reply. did the blend doors have any affect on the temp? I guess if they are creaking they are moving. once it gets bad enough then they dont move full travel and it could cause temp problems.

its interesting they heard it when i dropped it off but that was just the service writer that heard it. and then it did it in the lot when i picked it up.

 

I don't know if lubing the blend doors affected the temperature. I know I am not happy with the A/C temperature, but have not sat down with a temp guage to see exactly how cold it is.

 

i went out and crawled under the dash and worked the heat up full and cold full down. just above the gas pedal are some bell cranks and linkage. i shot some triflow teflon spray on them when they were working and noise is gone. does not seem to have made a difference on temp but i will see tomorrow when i drive it. this was in the drive way. and the whole time i got my wife saying to take her chevy cause its nice and cold.

 

The dealer is changing my blend doors for the grouling sound 2 and then are checking the air to make sure its got the right amount or freeon in it.
Also lost my info center and oil gauge light getting new cluster 05 XLT
supercrew

 

42 degrees is good to go. Won't get much colder than that without freezing the evaporator up.

 

the 42 they said they got and forgive to say they were lying is a whole lot better than the 67 i measured.

 

Well, how'd they measure that 42 degrees? With the system on normal or max A/C? At idle or going down the road?

 

i have no idea when they measured it or how. all i know is there was a noise that i told them about and it was blowing warm air and they tell me all is well.

i drove into work this morning and with it selected to 60 deg on the auto panel the air coming out was 38 deg. however the outside ambient was 75 deg. i guess i will wait and see what i get going home. hopefully the linkage that i lubed was binding and not letting the blend door move full travel and after working it and letting it sit all night that was the problem and its gone.

its a shame the way dealers around here are. they are so busy and profit driven that they dont care about the customers at all.

 

looking back over the post, i realize i never mentioned that this was not the dealer i have bought my last 4 vehicles from. i used to deal with this place until i went in a few times and the service dept was screwed up. the reason i ended up here is cause i was driving down the highway and saw a mustang GT convertible on the lot. pulled into look at it and out runs a salesman. during the converstation he asks if i ever bought anything there before. i explained i did and my reasons for going else where (the service dept). he says thats all changed. i say funny you say that as i have a problem with my truck. get me in tomorrow and well talk about the mustang when i come pick the truck up. i would have bought when i first stopped in except they did not have the color i liked and had to decide if i wanted a stick or auto. plus its good to let them wait a little that usually turns into more money off. so they have the sale of a loaded mustang riding on a service visit and they didnt get it right.

 

Just FYI, you can get some very different temperatures from different places and ways of measuring it.
Tests should be at max cool, recycle, doors and windows open, engine at low end of operating temp. Temperature should be made at the coldest (nearest the evaporator) vent.

This is to get a comparison reading which you use to verify the system is working properly.


The simplest way to measure the temperature is with a candy thermometer. These are little round disk thermometers with metal 'spikes' sticking about 6 inches out the back. You slide the candy thermometer into the vent closest to the evaporator and run the A/C at max. Temps of 46 will give adequate cooling in many areas. Temps below 40 are rare on R134 systems, but are attainable.

If you use a laser thermal temperature gun you can get some pretty weird results. If you aim down in the throat of the vent you can get temperatures down around 17 degrees!
This is with the inserted thermometer with temps at about 38. The laser reads way down inside where it gets pretty cold.

Over or under charged systems work almost the same way, decent cooling when it is just warm, lousy or failed cooling when the temperatures soar.

My truck is an STX regular cab and cools very well. We recently had a day of 110 with high humidity and the A/C kept my truck quite cold while going all day in city traffic with many stops where the truck had to cool down over and over.

So if you are experiencing poor results with one of these trucks it pays to get it fixed.

 

Coming from an ac technician who charges alot of vehicles, The lowest i have gotten any system to go is 38F the temp coming out of the vents does not varry from vehicle to vehicle it varies on the charge in the system. if it is fully charged, you should be able to get it down to 38F the other option u have which u need a refrigerant license is to replace the 134a that is in your system now, with hotshot it is another type of refrigerant, a fully synthetic refrigerant.

 

If you have a sun roof you should put some heat/sound proofing (pepboys) on the sliding door in your roof. This panel is hot to the touch when sun is out. easy to do ..slide panel back, unscrew 4 torx screwa on side of glass. push glass up and onto roof. remove and set aside, close panel ,cut material to fit, apply spray on adhesive ,aplly material foil side up, let dry 5-10 mins, open reinstall glass, enjoy cooler in cab temps!!! P.S. a/c blows at 40 after it has to cool the cab down from 122 in about 30-45 mins....yes they all SUCK!!!! why do you think ford is losing their a$$.....