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2000 Impala 3.8 overheating issue continues
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cw41
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PostPosted: Wed Jul 28, 2010 6:28 pm    Post subject: Grrrr ! 2000 Impala 3.8 overheating issue continues Reply with quote

My Impala has been in and out of the GM shop for the last three weeks trying to fix an overheating problem, not to the point of a boil over. Everything has been done including waterpump, tensioner, radiator, thermostat, hoses, flush heater core and finally removal of intakes and cleaning scale blockage in coolant ports and still no luck. In checking various components on the engine with a laser thermometer, I've found that the only hot area is around the thermostat LOWER housing where the temp sensor is at 235+. The upper thermo housing is normal at 190+ along with the radiator hoses, heater hoses and various other locations, wpump and engine areas. WTF!! is going on here?? Nobody including the shops GM engineer can diagnosis/fix the problem. The only thing that hasn't been checked is a combustion leak test which I think not the problem because of all areas except the lower thermosat housing shows normal temp. Thanks for any help here.
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2007SSImpala
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PostPosted: Thu Jul 29, 2010 7:30 pm    Post subject:   Reply with quote

Are your cooling fans turning on when the temperature gets too high?
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bbengineer
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PostPosted: Thu Jul 29, 2010 7:35 pm    Post subject:   Reply with quote

How did you measure the temp on the lower and upper housing? Could the ECT sensor be bad?

Also, are you positive you don't have an air pocket?

If it's not air, and the lower thermostat housing is hot and the upper is not, then either the thermostat isn't opening (or opening completely) or the water pump isn't doing it's job

I know you had that stuff replaced, but I'd replace the thermostat and make sure you bleed the system fully

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cw41
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PostPosted: Fri Jul 30, 2010 1:28 pm    Post subject:   Reply with quote

I measures temp with a laser thermometer and the system has been bled several times. It's had two new thermostats, one of which I gutted the internals and tried it and the only difference is it took longer to warm up but when it did the coolant area around the lower intake thermostat area still will run 235+. It has a new waterpump and the shop removed and verified it and supposed to of put a plastic gasket in place of the felt one. I don't know of a plastic one?? The fans are working properly as the shop forman took it up the hill with the laptop connected and verified the engine running hot. it has a new temp sensor also. Any ideas of where to go next would be appreciated.
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PostPosted: Fri Jul 30, 2010 1:29 pm    Post subject:   Reply with quote

At this point, I would guess there is a blockage in one of the water jackets in the block itself

Have you had the block flushed, or the freeze plugs removed and the block flushed?

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PostPosted: Fri Jul 30, 2010 1:48 pm    Post subject:   Reply with quote

They removed a freeze plug from the front of the block and checked that too!! Cannot believe still having this problem. i also had a new cat installed and I'm thinking that the resonator or muffler might be issue but don't know.
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PostPosted: Fri Jul 30, 2010 1:54 pm    Post subject:   Reply with quote

Resonator and muffler would not cause what you are seeing...

I would have the block flushed again... or maybe take it to a radiator shop and have them take a look

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Bill58
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PostPosted: Fri Jul 30, 2010 2:05 pm    Post subject:   Reply with quote

Have you checked for carbon monoxide in the coolant? CO in the coolant will be from cracked head or bad head gasket. Kind of a long shot but if you’re out of options… A exhaust gas analyzer can be used to check for CO at the radiator cap. Combustion gasses in the coolant will cause strange over heating problems.
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cw41
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PostPosted: Fri Jul 30, 2010 4:21 pm    Post subject:   Reply with quote

Thats the only thing that hasn't been checked but according to a laser thermometer, the only hot area is around the lower thermostat housing where the sensor for the gauge is the rest of the motor, hoses etc run normal. Nobody at GM can understand why or what is causing the issue. Thanks again.
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Bill58
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PostPosted: Fri Jul 30, 2010 6:31 pm    Post subject:   Reply with quote

Can you take the temp of a different car at the lower housing. Is it just heat soak from the lower intake? What does the temp gauge, instrument cluster, say?


Last edited by Bill58 on Sat Jul 31, 2010 7:34 am; edited 1 time in total
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cw41
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PostPosted: Fri Jul 30, 2010 6:42 pm    Post subject:   Reply with quote

That is a possibility. I'll mention it to the shop and see if they have a comparable 3.8 engine to check. thanks
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lostwrench
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PostPosted: Sat Jul 31, 2010 8:21 am    Post subject:   Reply with quote

Another long shot...............
Did you buy the car used? Perhaps a shade tree mechanic replaced an intake manifold or head gasket and put it in top side down or used a wrong gasket, blocking a coolant passage.
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PostPosted: Sun Aug 01, 2010 2:50 pm    Post subject:   Reply with quote

We've had the car for four years and no head gasket repairs have been made. They did however repalce the upper intake and all gaskets upper and lower and cleaned the coolant ports that had some white crud blockage but still while going uphill or when ambient is 100+, the car wants to run hot never did before. Everyone is stumped?? Thanks
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PostPosted: Mon Aug 09, 2010 2:43 pm    Post subject:   Reply with quote

I have a similar issue, but I don't boil over.
I have been running about 1:00 or 2:00 on the temp gauge (about 220-230 I'm guessing), but then again, it's been in the low 100's here as of late.

I just put in a new 195 degree thermostat, temp sensor and radiator cap this weekend and that has helped some. I've been staying about 12:00 or just above or under.
I bled the system at the thermostat, but I might have a small air pocket still that I need to get to, probably have to flush the entire system again...

Keep us posted on your findings!

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PostPosted: Fri Nov 26, 2010 4:54 pm    Post subject:   Reply with quote

My 01 started to heat up after several trips to the dealer for warranty work. It would heat up on the highway and cool down in traffic. Turned out to be an ignition switch! Dont ask me how why or what.... It was my moms car and it was and still has draw issues on the battery, so the dealer replaced the ing switch the pass lock system and some other things but never a BCM.

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