Hello everyone! I find myself in need of some advice. I have a ‘91 LJ73 with the 2LT engine. I just had an air conditioning system installed on my car, which came off an LJ70 with the same engine. Everything seems to be functional in terms of cold air blowing inside the car, the problem being that whenever i turn the AC on, the engine starts overheating. That does not only happen when i’m at a stop, but also while driving. Before installing the AC ststem I had recently changed all the cooling system hoses, got a new radiator, new cap, new thermostat, flushed the whole system. Did anyone have this issue after installing air conditioning on their car? Any help would be appreciated.
2LT engine overheating after installing AC (1 Viewer)
- Thread starter tomabichir
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The newly installed AC condenser is probably blocking air flow to the Rad.
- Thread starter
- #3
Thank you! If this was the case, shouldn’t the overheating occur even with the a/c off? The engine only overheats when i turn the a/c on and temperature goes back to normal after i turn it off.
jblueridge
SILVER Star
When the ac is on, the hot freon refrigerant makes the ac condenser radiator hot.
The air goes through the hot condenser, becomes warmer, then goes through your coolant radiator.
Since the ac system came from another LT engine, it seems like this should not be enough to make the engine overheat.
The air goes through the hot condenser, becomes warmer, then goes through your coolant radiator.
Since the ac system came from another LT engine, it seems like this should not be enough to make the engine overheat.
- Thread starter
- #5
I touched the condenser and it didn’t seem too hot. I could easily keep my hand on it. It was indeed a hot day (32 degrees Celsius), but I think it should be able to handle that, after all I need to use the AC when it’s hot outside. Is it possible that the water pump’s functionality is diminished when the compressor comes on?
check that the new tstat is functioning properly and opening completely. also, maybe the system didnt burp when you rebuilt it and its got air or low level coolant now?
GTSSportCoupe
2LTE abuser
Yes, do this ^^. Likely the fan is not drawing enough/
I notice my coolant gets hotter with A/C on too. But usually only noticeable under the most harsh circumstances like towing a caravan on hot summer days.
I've though of removing my A/C to help the engine, but the idea of not having A/C on 35C+ days is not very enticing. Let the engine suffer so I can be in comfort, lol.
I notice my coolant gets hotter with A/C on too. But usually only noticeable under the most harsh circumstances like towing a caravan on hot summer days.
I've though of removing my A/C to help the engine, but the idea of not having A/C on 35C+ days is not very enticing. Let the engine suffer so I can be in comfort, lol.
