Mechanics

RUNNING HOT

1999 Acura RL

Engine Cooling problem
1999 Acura RL 6 cyl Four Wheel Drive Automatic 130000 miles

I started noticing last week that everytime I turned on my AC, the needle on my temperture gauge starts going towards the H and my car would run hot. I turn off the AC, but by then it's too late. I also noticed that my fans were not turning on when the car ran hot, so I was advised to change the sensor. When I had a " Mechanic" look at it, he stated that the sensor was not bad, yet I needed a new Radiator Cap. He also stated that when he checked the car, the fans came on. The cap was replaced and the car ran fine for 3 days. Yesterday, I had the AC on and it started doing the same thing. I turned it off and the needle on the gauge instantly dropped back down to a normal level, but soon shot back up and the car overheated really bad. Once I got home and lifted the hood, I seen the hose that runs from the Radiator to the Thermostat had a hole in it and Antifreeze was everywhere. So, I know I definitely have to replace the hose, but I am getting conflicting theories on what's causing the problem. I have been told to change the Thermostat and I have been told to get the sensor replaced. I don't know what to do, but I don't want to waste money replacing unnecessary things and/or damage my car in the process. Please Help!
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Blk_cfy
July 14, 2010.



Hi blk_cfy,

The hose is bad so get it replaced, top up the coolant, bleed the system and rung the engine.

Turn A/C on, ensure both fans are working. If any fan is not working, then it has to be checked.

When both fans are working, does the engine overheat?

Monitor if the coolant level in radiator remains constant when engine is running with A/C turned on and fans working.

KHLow2008
Jul 14, 2010.