i have a 1990 volvo 740. the a/c compressor is running, and the refrigerant gauge shows system is charged, however it does not put out cold air. the a/c has been working until a couple days ago. any help appreciated.
Country: United StatesMake: VolvoModel: 740Year: 1990Engine: 4 cyl.
the comp. wouldn't come on. it was not equipped with 134refrigerant fittings. i put new fittings on and charged system with over the counter 134 with a guage. system worked fine for about six weeks. a/c began not to cool. checked pressure, fine,comp. runs, but no cool.
Volvo Master Technician with 15 years excusively with Volvos. Also ASE L1certified for over 10 years.
i did as you suggested, my mechanic says there is a ''valve'' coming from a T in the drier line that needs to be replaced, but, i don't know what this part is called. any help appreciated.
Yes , you may have a clogged "expansion valve" which is affecting cooling. This valve is simply a special screened device about the size of a cigarette on your car, also known as an "orifice tube". Volvo used the General Motors office tube in this car. There is a line between the condenser and the evaporator inlet fitting on the firewall. If you disconnect this line at the firewall you should find the orifice tube inserted into the evaporator inlet pipe. It car usually be carefully twisted and removed with a pair of needle nose pliers. you will see debris on the screen if this is the problem. this would be a good time to replace the receiver/dryer as well, and add about 2 ounces of ester oil to the new dryer.