My MR2 used the R134a refrigerant / gas.
This shows a cheep and easy way to re-gas the air conditioning system.
Halfords sell a "kit"
that includes a pressure gauge and a canister of
Firstly remove spare wheel and the plastic shrouding that covers up everything.
Now locate the low pressure valve / cap it should have the letter "L" on it (top smaller cap)
I shall hear on refer to the low pressure valve as the "L" valve.
Now get your canister of R134a gas and connect the pressure gauge pipe to it.
Unscrew the "L" cap and place the other end of the pipe coming from gauge onto the "L" valve.
Now the instructions say start engine and switch on air con to max cooling so do that.
Now go back to canister,
shake and press valve to start the refill, as soon as some pressure
The above cutting in /
out is due to a low pressure sensor, this prevents the compressor from
Hold down the gas can valve for 5 second in several intervals then release and check the pressure gauge.
On my gauge green meant
needs gas, blue meant ok / full, yellow meant over full / possible problem,
keep filling it till the needle is over half way into the blue / ok part.
Now turn off engine and disconnect the refill pipe from the "L" valve
DO NOT undo the pipe from
the end of the gas can before removing it from the "L" valve,
Take car for a 10 minute
run with air con on full it should be very cold, then re-test pressure.
If the gauge needle is in the blue over half way you have successfully re-gas ed your air conditioning system, now enjoy the cold!
If it has gone down top
up and try again, if it still goes down you my have a leak somewhere
The last pictire shows the flow view window when your air con is on you should see liquid passing by.
© 1981 - 2006 John