Overheat with AC on
#1
Join Date: Apr 2010
Location: Upstate South Carolina
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Overheat with AC on
Well with the weather as hot as it has been I've noticed that the temp gauge starts creeping up when the vehicle is stationary with the AC on. Yesterday it started warming up on my at 50mph with the AC on. Temp drops down to normal level immediately after turning off the AC. I have replaced the thermostat, checked the coolant level, and cleaned between the radiator and condenser. Condenser fans are working properly. Anything else to look at before I pull the radiator and get it rodded?
#2
Well with the weather as hot as it has been I've noticed that the temp gauge starts creeping up when the vehicle is stationary with the AC on. Yesterday it started warming up on my at 50mph with the AC on. Temp drops down to normal level immediately after turning off the AC. I have replaced the thermostat, checked the coolant level, and cleaned between the radiator and condenser. Condenser fans are working properly. Anything else to look at before I pull the radiator and get it rodded?
#6
Can't believe no one has said it yet... fan clutch.
Had the exact same problem and found my clutch was leaking fluid and not working as it is suppose to.
There are piles of threads like this on here. Suggest you search first if you have any more questions (like how do I check it, how do I remove it, etc.)
My temp gauge needle doesn't even move now in 90+ degree weather with the A/C on and parked. You can once again hear the roar of the fan - hadn't hear it in a long time.
Had the exact same problem and found my clutch was leaking fluid and not working as it is suppose to.
There are piles of threads like this on here. Suggest you search first if you have any more questions (like how do I check it, how do I remove it, etc.)
My temp gauge needle doesn't even move now in 90+ degree weather with the A/C on and parked. You can once again hear the roar of the fan - hadn't hear it in a long time.
#7
About $65 for rod out at indy shop in my area, try to find one that works on tractors and heavy equipment. Be sure fans are blowing correct direction , toward the engine. My PO wired replacement fans reverse polarity, and would over heat whenever AC on and slow or idle. Test with plastic bag in front of grill, engine not cranked, AC on (fans should be running) - bag sucks toward grill. Same when truck cranked. Also check you main fan clutch. When warmed up, fan should spin, but not a whole turn. If it free wheels, the clutch is gone. Tech section has write up on $50 Chevy unit, which works great. When cold, the fan will roar when first started, because it is moving more air. Spinning it when cold should only turn a fraction of a turn.
#8
But if overheating at 50 mph, it ain't the fan clutch (unless fan blades are on backwards). Want to test this theory? Hold a pizza box outside the window at 50 mph. I had a wobbly water pump pulley (bad pump), removed my fan and clutch, drove 30 miles home, no problems. Just don't stop for long periods. And if water pump failure is about to happen, better to have fan in the back seat than coming through the radiator or hood. I'll bet on the radiator, hope when it is resolved we get some follow up. But it is always free to check the fan clutch, you are typing with the required equipment.
#9
Join Date: Apr 2010
Location: Upstate South Carolina
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Fan clutch is less than a year old. Gonna inspect the water pump and pull the radiator and have it rodded out. Local shop wants $50 bucks. Figure its worth it. Hopefully a rodded and cleaned radiator, a cooling system flush and fresh coolant and a bottle of Water Wetter will rectify my problems.
#10
Fan clutch is less than a year old. Gonna inspect the water pump and pull the radiator and have it rodded out. Local shop wants $50 bucks. Figure its worth it. Hopefully a rodded and cleaned radiator, a cooling system flush and fresh coolant and a bottle of Water Wetter will rectify my problems.