Posted: Thu Feb 23, 2012 2:20 pm Post subject: Recurring Nightmare
I have a 2004 3.4 base impala and I have overheating issues. The needle goes to the red, drops back down, then rests close to the 260 mark then drops again and so on. The heat also doesn't work. It usually overheats while sitting still, then cools down on acceleration. The sporadic jumping around of the temp gauge led my mechanic to replace the thermostat. Car drove fine for the first day. Never got past the halfway mark, heat got plenty hot. The following evening, it began overheating and blowing cold again. Upper radiator hose got a gash in it. Replaced that and got a mechanic to fully bleed and fill the system due to air being trapped. Again, it drove great for a whole day, heat was hot. Next evening, back to overheating and cold heat. I'm very limited in my repair knowledge but I was always told no heat and overheating meant heater core. I was also told my radiator might need replacing. At some point in its life it got switched to green so there's a buildup from the mix. I cant keep paying to get this car fixed for a few days. Anybody have any way to troubleshoot this?
Has your mechanic done a pressure test to see if the system is closed? If not, the first thing I'd do is thoroughly flush the system to get rid of the junk that formed with the green coolant being added. That being said, I don't know if you had your LIM gaskets replaced yet, but the goop in your coolant could be oil and coolant mixing...
Protip: If you don't know what you're doing, don't do it.
I had a mechanic flush and fll before the tstat change. Then it had that hose burst so I had it bled again. That's when he pressure checked it and told me its closed. He also said my head gaskets weren't blown after he finished with the bleeding. As far as i know the lim gasket hasn't been changed. The hoses r extremeely hot but is the
Take the radiator cap off and start the car. Let it heat up, I bet there is air in the system. As the car heats up the level in the radiator will want to rise so put a drain pan under it. The level should fall after the t-stat opens, and if there is air it should fall significantly. Top the coolant up with the car on, and put the cap back on and post up your results.
Is there any definite way to tell if the lim gasket needs replaced? I filled the radiator as described and nothing happened. Just overheating like usual. It doesnt even cool off when I start moving down the road like it use to. Are there any tests I can do myself or ask a mechanic to do that can determine if the lim gasket needs replacing? I cant keep paying mechanics to diagnose, second guess, and tell me they fixed it
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