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2000 Impala 3.8 101k overheating

 
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cw41
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2000 Chevrolet Impala


PostPosted: Tue May 31, 2011 6:54 pm    Post subject:  2000 Impala 3.8 101k overheating Reply with quote

I'm still having issues with my impala overheating, not to the point of boiling but up in the red when ambient is above 80deg. Everything the shop and myself has been thrown at this, w/pump, tensioner, upper plenum, radiator and fans, thermostat, freeze plug removed, flushed twice, etc., including a new exhaust system w/cat which is turning blue from the heat. The end of the muffler is turning blue, Walker brand. Today I noticed a new symptom, when the temp is normal and I lock trans in low gear and drive, holding rev's to 3500rpm's or so, within no time the temp gauge rises and won't cool for miles. The outside temp was about 70deg. WTF now! I'm at my witts end. Thanks for any help on this issue.
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98ss
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PostPosted: Tue May 31, 2011 10:38 pm    Post subject:   Reply with quote

If the temp goes up and down, it could be an air bubble in the system.
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BlackVenom
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PostPosted: Tue May 31, 2011 11:18 pm    Post subject:   Reply with quote

Any sign of leakage anywhere? OOC. are you using dex or other brand of coolant?

98ss wrote:
If the temp goes up and down, it could be an air bubble in the system.


It's been flushed twice, that shouldve taken care of it.

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IffyG
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PostPosted: Wed Jun 01, 2011 12:02 am    Post subject:   Reply with quote

Has your mechanic checked the coolant temperature sensor?

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Arvetus
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PostPosted: Wed Jun 01, 2011 10:46 am    Post subject:   Reply with quote

Check or replace the coolant temp sensor. They are <$10 and super easy to replace in the 3800.

Check fans and relays. If you have already replaced the fan assembly, check the relays. You may have one that burned up and is not allowing the second cooling fan to turn at full speed.

Is thermostat stuck closed?

How's the intake gaskets? I'm assuming no leaks? Has a pressure test been done?

Did you check the water pump? They can fail and still have good bearings and gaskets. The impeller can get wore and or rusted down to nubs and not circulate coolant like it should. You will not know this until you pull and visually inspect. They are only $30 or so, give or take.

I believe the 3800 has cast iron heads, so they are unlikely to warp, but it is not unheard of. Hopefully it is not head gaskets...it's not an impossible fix, just time consuming. But at only 101k, would still be worth your while. If it does turn out to be head gaskets, I would go ahead replace all the other gaskets while everything is apart. Once you do that, you will be ready to go for another 200k Smile

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- 2001 Impala Base - Navy Blue Metallic
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cw41
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PostPosted: Wed Jun 01, 2011 2:10 pm    Post subject:   Reply with quote

I've replaced the temp sensor with the same results, the fan assembly is new gm, thermostat is new, they removed the intake and cleaned the scale on the coolant ports and put on a new gaskets with a new upper plenum, pressure test is good along with a combustion test is ok and a new water pump with tensioner and still gets hot. Can you leave a pint of gm cooling system cleanser in for a while and let it disolve any scale or am I going to ruin the head gaskets? Thanks for any help as I'm out of ideas next ot pulling the heads or entire motor.

Arvetus wrote:
Check or replace the coolant temp sensor. They are <$10 and super easy to replace in the 3800.

Check fans and relays. If you have already replaced the fan assembly, check the relays. You may have one that burned up and is not allowing the second cooling fan to turn at full speed.

Is thermostat stuck closed?

How's the intake gaskets? I'm assuming no leaks? Has a pressure test been done?

Did you check the water pump? They can fail and still have good bearings and gaskets. The impeller can get wore and or rusted down to nubs and not circulate coolant like it should. You will not know this until you pull and visually inspect. They are only $30 or so, give or take.

I believe the 3800 has cast iron heads, so they are unlikely to warp, but it is not unheard of. Hopefully it is not head gaskets...it's not an impossible fix, just time consuming. But at only 101k, would still be worth your while. If it does turn out to be head gaskets, I would go ahead replace all the other gaskets while everything is apart. Once you do that, you will be ready to go for another 200k Smile
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ZSPOT
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PostPosted: Wed Jun 01, 2011 5:36 pm    Post subject:   Reply with quote

Ever check the EGR valve? I 2nd the relays as well. I'd try bleeding it again, and again as well. Sometimes it's hard to fully burp certain cars.

With a cooling system being a fairly simple system, and everthing already being replaced, assuming corretly, there isn't a whole lot left. Unless you heater core is plugged. Since it's summer, you could try bypassing it for a time and see if it cures it.

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cw41
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PostPosted: Wed Jun 01, 2011 5:49 pm    Post subject:   Reply with quote

No I haven't checked the EGR. Where is it located on the 3.8? The fan relays work fine. I've thought about the heater core having issues since it plugged up about a year ago they backflushed it and everything was ok, i just didn't know to the following summer how bad it overheated. I've burped it 10 times or more with the same results. Thanks for the tip. Should my post be on the other forum for problem cars?

ZSPOT wrote:
Ever check the EGR valve? I 2nd the relays as well. I'd try bleeding it again, and again as well. Sometimes it's hard to fully burp certain cars.

With a cooling system being a fairly simple system, and everthing already being replaced, assuming corretly, there isn't a whole lot left. Unless you heater core is plugged. Since it's summer, you could try bypassing it for a time and see if it cures it.
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Arvetus
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PostPosted: Thu Jun 02, 2011 4:47 pm    Post subject:   Reply with quote

Have you even checked the fan relays?

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cw41
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PostPosted: Sat Jun 04, 2011 5:37 pm    Post subject:   Reply with quote

Yes the relays are working one comes on when the ac is turned on and the other will come on when it heats up. What I don't know is if they are not running constant when the temp is at a certain level when driving. The grill provides very little air intake and the air dam is on and in good shape. Could I have a blockage behing the water pump? The shop inspected the pump and it is new and functioning properly. I'm not sure what it would take to check it but it might be the next place I'll look at. I have the factory gm shop manuals to go by if needed. Thanks again
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Arvetus
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PostPosted: Sat Jun 04, 2011 7:30 pm    Post subject:   Reply with quote

the fans turn at two speeds, low and high....
here is a basic idea of how the two fans work together and what happens if you have a bad relay somewhere...

Fan Relay Bad -----------------Low Speed-----------------------High Speed
Relay 1---------------------------no fans ---------------------------1 fan runs fast 1 fan no run
Relay 2---------------------------2 fans slow----------------------1 fan runs fast 1 fan no run
Relay 3---------------------------2 fans slow----------------------1 fan runs fast 1 fan no run

when I replaced my fans, I found I also had 1 bad relay as well...when I pulled it, it happened to be very obvious

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- 2001 Impala Base - Navy Blue Metallic
- 3800 Series II


RIP 10/23/2010, 191,197 miles - traded on a 2003 Tahoe Z71
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cw41
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2000 Chevrolet Impala


PostPosted: Sat Jun 04, 2011 10:55 pm    Post subject:   Reply with quote

Thanks I'll check them again..

Arvetus wrote:
the fans turn at two speeds, low and high....
here is a basic idea of how the two fans work together and what happens if you have a bad relay somewhere...

Fan Relay Bad -----------------Low Speed-----------------------High Speed
Relay 1---------------------------no fans ---------------------------1 fan runs fast 1 fan no run
Relay 2---------------------------2 fans slow----------------------1 fan runs fast 1 fan no run
Relay 3---------------------------2 fans slow----------------------1 fan runs fast 1 fan no run

when I replaced my fans, I found I also had 1 bad relay as well...when I pulled it, it happened to be very obvious
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