DHS740IL
08-25-2009, 03:33 PM
I have a 1995 740iL with 160,000 miles on it. I checked the service records for the last 6 years or so and found no reference to any a/c service. My a/c is working okay, but not great. I did replace the recirc filters and that helped a TON with the volume of air. But, it still isn't cooling all that well. Last week when it was only 70-75, it was only cooling down to 60 degrees (as measured with a thermometer at the vent). So, I am pretty sure my 134a is low.
I do not have a set of gauges, but my car does have a sight glass. So, can I just buy the can of 134a from the parts place that has the cheesy hose connection on it and add some while watching the sight glass. I am thinking in 12 years, it has lost some pressure. I know if I put TOO MUCH 134, it will make it worse, but if I put in about a half of can and then check the temp and its better and then add a little bit more at a time until I either use up the can or the temp stops dropping, will that work?
I do not have a set of gauges, but my car does have a sight glass. So, can I just buy the can of 134a from the parts place that has the cheesy hose connection on it and add some while watching the sight glass. I am thinking in 12 years, it has lost some pressure. I know if I put TOO MUCH 134, it will make it worse, but if I put in about a half of can and then check the temp and its better and then add a little bit more at a time until I either use up the can or the temp stops dropping, will that work?