983m cab aircon (1 Viewer)

[xerxes]

Hi
I have a 57 reg 983m the cab air con works for around 5 minutes then I have to press the air con reset switch to get it to work for another 5 minutes does anyone know if this is how it should work or is there a fault.
Many thanks

 

[Richard n Ann]

Where is the aircon reset switch? Under the bonnet?

 

[xerxes]

No, on the dash under the air con controls it is marked aircon/reset which is a bit confusing as it's the switch to turn the air con on but I have to turn it off and on again every 5 minutes to maintain cold air, had a look to see if there was a relay in the circuit that was faulty but could not find anything.

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[joka250]

Hi
I have a 57 reg 983m the cab air con works for around 5 minutes then I have to press the air con reset switch to get it to work for another 5 minutes does anyone know if this is how it should work or is there a fault.
Many thanks

It's quite possible that the refrigerant is low on quantity. Would suggest you find a good local vehicle aircon specialist to check it out. Perhaps other Funsters in your area can help.

 

[mike mcglynn]

Halfords did mine and it works a treat now cost about £30 special offer.

 

[xerxes]

Had this done last year by a local garage and they said it appeared to be working correctly, I will take to another garage and get it checked for gas, away next week so it will have to be the week after will update after it's been checked

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[Richard n Ann]

It's not gas if it works OK for 5 minutes. It's a control problem. Not heard of a reset switch inside the vehicle. Perhaps an auto electrician could trace the problem?

 

[xerxes]

Yes might have to go down that route, if I can find a wiring diagram might be able to check it myself Been looking on the web but trying to find the right one is proving difficult, was not quite correct with the dash switch it is marked on/reset

 

[DavidG58]

The button is confusing, the light is off when air con running

The reset is actually ‘rest’ equally confusing and uses residual heat or cold to maintain cab temp when engine turned off, the light comes on when used and only runs for around 5 mins a very useful function when you know and remember

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[xerxes]

Like you say very confusing I will have to investigate further how it works perhaps tomorrow as I must go and do some work thanks very much for everybodys input will update soon

 

[joka250]

If the refrigerant is at half charge for example there is sufficient to operate system and achieve reasonable performance for a short period but after a while system will cycle out. As a first and low cost step I would check system using a good manifold gauge and see what's happening.
If system needed recharging last year then it's almost certain there is some leakage occurring. An air con specialist is the way to go, they will be able to determine what's happening. Companies that offer cheapish recharges will only mask and temporarily solve the problem.

 

[Richard n Ann]

If the refrigerant is at half charge for example there is sufficient to operate system and achieve reasonable performance for a short period

^incorrect^

In fact quite the opposite. When a system short of refrigerant is first switched on, it will give bugger all cooling for a while, then you will notice maybe one vent get cold, the other 3 outlets will stay warm.

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[Richard n Ann]

^incorrect^

In fact quite the opposite. When a system short of refrigerant is first switched on, it will give bugger all cooling for a while, then you will notice maybe one vent get cold, the other 3 outlets will stay warm

 

[EuroTrotters]

A probable cause is the NTC in the plenum chamber if it is a climate / semi climate control.

Halfords did mine and it works a treat now cost about £30 special offer.

The gas costs more than £30 now!.

Currently running at around £35 a kG.

 

[EuroTrotters]

As I said, could be the NTC.

Less likely are LP/HP Switch faulty.

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[joka250]

^incorrect^

In fact quite the opposite. When a system short of refrigerant is first switched on, it will give bugger all cooling for a while, then you will notice maybe one vent get cold, the other 3 outlets will stay warm

While not disputing your suggestion I base my comments on more than 20 years of dealing exclusively with automotive air conditioning. I would reiterate that with a problem such as this the first port of call should be an auto air conditioning specialist.