1993 Volvo 850 AC blows cold for a few, then goes hot
My AC has been recharged and checked again. Charge is good. Sometimes we will be going down the road and it suddenly starts blowing hot. Sometimes it will start going cold again. When its cold, its really cold. Couldn't see any freezing of lines around firewall to compressor.
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start off with the cheap possibilities and make your way threw. I'd start off with replacing Air Charge temperature sensor, make sure your AC Hose isnt leaking anywhere, if those dont solve it then replace ur AC clutch, last chance would be replacing AC compressor. sometimes the compressor will malfunction randomly. or the AC clutch might malfunction aswell. covering these steps somewhere along the line you will have working AC again! good luck
you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
AC will not work with temps are cold even when it is turned on. The air is colder cause the temp is colder. The AC cycles in hot weather because the AC charge is low and needs recharging. You will know this if you open the hood run the AC and you will hear the clicking sound of the AC compressor magnetic clutch. You can recharge it easily buy buying a compatible can of refrigerant. I suggest buying the kit with the gage so you don't overcharge the system which will cause freeze ups
It sounds like your fuel pump is having a problem with getting the last of the fuel from your tank. The pump also has a strainer on it. The unfortunate reality with the 1993 Volvo 850 is that the pump and strainer are located inside of your gas tank. You can look for kinks or pinched areas in the line but from your description it sounds like the pump is going. It has to work much harder when the fuel is low in the tank.
I AM AN ASE CERTIFIED VOLVO----MASTER TECH AND YOUR PROBLEM W`HICH IS COMMON ON ALL 850,S ANDS70,S THE PROBLEM IS PROBALLY AT LEAST 70% DUE TO AN AIR-FLOW RISTRICTION TO THE CONDENSOR FIRST IS SYSTEM AT FULL CHARGE LOW SIDE 25-33 PSI AND YOU AND I REPEAT ONLY CHARGE SYSTEM ON THE LOW SIDE THERE IS NO AND I REPEAT NO HIGH PRESSURE CONNECTOR AND WHAT I WOULD DO IS RUN AGOOD THICK WIRE FROM A/C COMPRESSOR AND A 30 AMP FUSE FROM A CIRCUIT LIKE THE HEATED SEATS FROM INSIDE THE CAR WITH A TOGGLE SWITCH AND A THERMOMETER IN CENTER AIR DUCT AND MANUALLY SHUT THE SYSTEM DOWN IF IT FALLS BELOW 40 DEGREES AND WATCH THE THERMOMETER EVERY 7 MINUTES AND THE MAIN PROBLEM IS THE ENGINE FAN CIRCUIT I HAVE DONE DOZENS OF THESE AND THE PROCEDURE IS WHAT I WROTE