air con, what tempreture

T-Cut · 22nd August 2019, 08:39

Quote:

Originally Posted by macafee2

The outside temperature sensor is not fitted to dash shows -30. not sure if that makes a difference

It sure does. Why would the aircon freezer system run if it sees an ambient temperature so low? The aircon system operates on temperature differentials one of which is the ambient. Logically, it cools ambient air to a setting that's below ambient.

Connect up the sensor and once it recalibrates to the correct reading, try the aircon again.

TC

SD1too · 22nd August 2019, 09:11

Quote:

Originally Posted by T-Cut

Why would the aircon freezer system run if it sees an ambient temperature so low?

I've wondered that ever since I noticed mine running when there was snow on the ground.

Simon

suzublu · 22nd August 2019, 10:06

Does not the thumbwheel under the clock position affect the temperature from the vents

ie, open or closed

SD1too · 22nd August 2019, 10:35

Quote:

Originally Posted by suzublu

Does not the thumbwheel under the clock position affect the temperature from the vents

ie, open or closed

A valid point to raise Ron and yes it does, but it is fed by air whose temperature is controlled by the rocker switches. This is why these should be set to 'LO' so that there is no heated air being distributed.

Simon

Odd Job · 22nd August 2019, 21:24

Where did you have it re-gased?
Some places use " re-cycled" gas as when they do a re-gas the system gets evacuated first, pressure tested then if no serious leaks detected, re-gassed.

Most modern systems are automated. Connect the car up and leave to their "thing" for 30 - 45 mins.

So, in short. Any "old" gas in the system gets removed first before being recharged.
Your "new" gas is actually partially re-used gas which will be contaminated with atmospheric air, water, and oil etc.
So your air-con system will never be up to its original capacity even if its fully functional.

Hard to find a place these days that use " new " gas in a system.

SD1too · 22nd August 2019, 21:55

Quote:

Originally Posted by Odd Job

Some places use " re-cycled" gas ...
Your "new" gas is actually partially re-used gas which will be contaminated with atmospheric air, water, and oil etc.

How did you discover this Richard?

Simon

SCP440 · 23rd August 2019, 06:43

Quote:

Originally Posted by SD1too

How did you discover this Richard?

Simon

This has been common practice for a while, have you seen the price of R134A now? Not that long ago a 13kg bottle was about £100 now it costs about £300 and we are told how bad it is for the environment? If an engineer can use ''old'' gas of course he will. I have been told it is going to get more expensive as the new gas is being phased in.

macafee2 · 23rd August 2019, 21:43

there is lots of advice in this thread. I will need to re read once the bumper and sensor goes back on.

Some of the advice to those that know is common sense, to me, I had not even considered some of the things.

Big thanks to everyone that has replied, I appreciate it.

I'll even need to get the handbook out to re read about the thumb wheel.

thank you again

macafee2

macafee2 · 25th August 2019, 08:23

I put the car back together last night and set the controls to Lo and it made a tremendous difference, the air from the vents was much much colder.

Thank you for the advice

macafee2

22nd August 2019, 21:24	#5
Odd Job Gets stuck in MG ZT 2.0 cdti Join Date: Aug 2019 Location: Derby Posts: 909 Thanks: 298 Thanked 191 Times in 149 Posts	Where did you have it re-gased? Some places use " re-cycled" gas as when they do a re-gas the system gets evacuated first, pressure tested then if no serious leaks detected, re-gassed. Most modern systems are automated. Connect the car up and leave to their "thing" for 30 - 45 mins. So, in short. Any "old" gas in the system gets removed first before being recharged. Your "new" gas is actually partially re-used gas which will be contaminated with atmospheric air, water, and oil etc. So your air-con system will never be up to its original capacity even if its fully functional. Hard to find a place these days that use " new " gas in a system. __________________ ….And the latest thing to break is..... ### MG STANDS FOR "MY GREMLIN" !!!

22nd August 2019, 10:06	#3
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,947 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Does not the thumbwheel under the clock position affect the temperature from the vents ie, open or closed

23rd August 2019, 21:43	#8
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,953 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	there is lots of advice in this thread. I will need to re read once the bumper and sensor goes back on. Some of the advice to those that know is common sense, to me, I had not even considered some of the things. Big thanks to everyone that has replied, I appreciate it. I'll even need to get the handbook out to re read about the thumb wheel. thank you again macafee2

25th August 2019, 08:23	#9
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,953 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	I put the car back together last night and set the controls to Lo and it made a tremendous difference, the air from the vents was much much colder. Thank you for the advice macafee2