QuestionMy 1984 cadillac eldorado overheats only when A/C is on. What may be causing this? Thanks!
AnswerHello,
There is not one standard answer here and there are many that have to be considered including those I have not thought of.
Radiator, thermostat, plugged cooling system, fan clutch, too much water and not enough anti-freeze lowering boiling point, timing, computer etc. You need this vehicle looked at by a professional, otherwise you are going to replace good parts on a guess and could get very costly.
WARNING: This is the ht-4100 aluminum engine. If the temp gauge goes above 3/4 you are causing this engine to self destruct in a major way. Head gaskets, cracked heads, cracked block are very common from overheating and I handle about 3 engine damage questions a week on the aluminum engines put out from 1982 to present by Cadillac.
People think these are like the old Chevy cast iron engines you could get away with overheating. Worse yet, chances of finding a good used engine is slim to none!!
I know you won't like this, but please remember I did not engineer or build this problematic engine. Until you get it fixed, keep the temp gage between 1/2 and 3/4. If thus means you can't run the A/C so be it. Don't think I do not understand. I am in Texas and it has been over 100 forever it seems.
If it starts getting hot and keeping the A/C not running does not help, you can turn on the heat so it can circulate and keep the engine cooler. If the temp goes to the red, your engine WILL BE BEYOND REPAIR!
Good Luck!
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Thanks,
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