heater/ air con problems

[lofty1967]

hi i am having problems with my heater basicaly it will not go cold. i have a 2001 terrano ii se+. i have had the air con re gassed by kwik fit. the guy there said it would appear to be the control panel. but has anyone had a similer problem and how do i fix it. thank you inadvance for any help.

 

[Guest]

Kwik fit Hmmmmm, re gassed, not serviced. Probably needs servicing and re gassing. If you do a search there are a few posts on here about this(and Kwik fit)

 

[jace]

you got heatwave in blackburn then mate?

 

[JonathanM]

The Kwik fit service is a purge of the old gas, pressure test, and then regas & lubricant, so it is pretty near to ticking all the boxes for an AC service, one thing to note is that if they are unable to complete the process, they don't charge, but neither can they repair any faults preventing the service. Plus AC in winter is excellent for demisting, mine was running on & off all day saturday as Joanne was in & out the car getting wet gate opening, and it just helped with the demisting.

How does the control panel for the heater work on our vehicles, is it cable operated or vaccum?

 

[terranokid]

Before you start have you checked your pollen filter?

Kwik fit were trained at the same place I was and use a machine that does service the ac system but they dont use the machine properly I have been at autoclimate when they have phoned in problems with there machines because they pressed all the wrong buttons. They have not gone through the full training and are not allowed to work on systems with low gas or leaks.
There could be a couple of things that could be wrong with your ac system.

firstly a leak and the system has lost pressure (usually a stone chip in the condensor )
It could be a blockage in the system this could be caused by air in the system or ice crystals caused by moisture being 2001 its time that your reciever/drier is replaced this removes any moisture from the system using silica crystals but they are destroyed as they absorb moisture
Your system should have the gas recovered then it should be vacuumed out for at least 30mins they also test for leaks then the system should be regassed and oil added if necassary.

 

[Deleted Member]

being 2001 its time that your receiver/drier is replaced this removes any moisture from the system using silica crystals but they are destroyed as they absorb moisture
Your system should have the gas recovered then it should be vacuumed out for at least 30mins they also test for leaks then the system should be re gassed and oil added if necessary.

So when should the aircon be serviced?,i have 2000 mk3,no probs with air con,works fine!!,no record of it being serviced unless it is in a major service!

 

[JonathanM]

being 2001 its time that your receiver/drier is replaced this removes any moisture from the system using silica crystals but they are destroyed as they absorb moisture
Your system should have the gas recovered then it should be vacuumed out for at least 30mins they also test for leaks then the system should be re gassed and oil added if necessary.

So when should the aircon be serviced?,i have 2000 mk3,no probs with air con,works fine!!,no record of it being serviced unless it is in a major service!

Probably won't have been done, although some manufacturers list it as a service item it rarely gets done. My 2001 didn't have a functioning system when I bought it, it had a cheap regas by the car sales place, but last year started giving me grief, noisy, poor cooling etc, so I ran it through Kwik fit, did the job for me.

 

[terranokid]

Its recomended that the system is serviced and regased every 2yrs if its left for 5yrs enough gas will escape to stop the sytem working this is normal it doesn't mean you have a major leak. if you have the system serviced every 2yrs and you run the aircon at least once a week you shouldn't need to do much else if you haven't had it serviced for about 5yrs or the gas has all leaked out you will need to get the drier/reciver changed before it is regasse.
I dont mean to say that all kwik fit employees are useless but they have had very little training but if they use the equipment as they have been shown they are capable of doing the job properly

 

[jace]

isnt there a member whos a aircon egineer?

 

[iandouglas]

hi lofty1967 .
you state your heater will not run cold.
do you meen it will not blow cold air when the temp control lever is in cold position?
if so test from cold place temp control on cold run engine as normal to warm it up. turn blower on HAVE YOU GOT HOT AIR?
if so it meens the lever is not moving heater control valve
which is at front of heater" follow heater pipes to control valve"
.have a look in downloads section (replacing heater matrix) for more idea of location . A ROD PASSES THROUGH HEATER BODY AND COMES OUT AT REAR OF HEATER AND CABLE CONNECTS TO THAT.
problem could be at lever end its just a wire rod /cable
rgds.iandouglas

 

[glen]

Heater control card

hi
Heater Control card that controls speed
control card can be found in the heater motor, firstly remove the wiring plug-in connecter, there are two cross headed self tappers holding the connecter block in the moter body take these out and out comes the control card, use a very short screwdriver

It is a small circuit board which is locaed in a very hard to get at place underneath and behind the glove compartment. about 30 minutes of fiddling around. The part was about £35

Glen

 

[pond]

Hello, I am new here, this is my first post!

As i am a refrigeration/ac engineer I may be of some use!

First, when the a/c button is 'on' and the temp is set to coldest check that the electromagnetic clutch on the front of the a/c compressor is engaged, if it is you will see it turning. If it is but cycles in and out quickly (approx 10 seconds) then it is short of gas (refrigerant).

If it isn't turning, find an accessible place to check voltage of the power cable to the clutch ( they usually have a plug on or near the comp, remove it and check to see if you've got 12 volts).

If you have 12 volts but the clutch is not engaged (turning) then the solenoid is probably faulty.

If you have plenty of gas (you can check this by taking off the cover of one of the service ports and pressing the valve GENTLY with a small screwdriver. BE CAREFUL REFRIGERANT BURNS) but the clutch does not engage, it will probably be a/c fuse or relay problem.

The majority of a/c faults are gas related (leaks). Electrical and compressor problems are not common, although I don't know Nissan's a/c system specifically.

Any other info, let me know! :wink:

Pond

 

[rossco]

Posted in wrong "Forum" so shifted to here :wink: