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1999 Cutlass overheating mystery no one has solved


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rgriffin087
New User

Nov 3, 2012, 7:35 PM

Post #1 of 11 (1368 views)
1999 Cutlass overheating mystery no one has solved Sign In

Cooling problem with 1999 Cutlass Supreme going unsolved. I have replaced the thermostat (correctly), the waterpump and coolant reservior and cap. I have checked the coolant for exhaust gases as well as the oil for the milky substance for indications of a bad head all passed. So my problem, when my car is driven at a slow speed the tempature begins to rise but as long as i stay at a slow speed once it gets to 3/4 mark it seems as if the thermostat opens and the car goes back to normal. Now when I get to highway speeds to quickly the gauge continues to climb and reaches the red until I stop sit for a minute, turn the car off then back on then it reaches normal tempatures. Once the tempature is leveled out it will run fine for hours. Also when it gets hot it will push all of the coolant out of the reservior hose. I have checked for leaks and done a pressure test and didnt find any leaks. This also seems to be related somewhat to the heat, when the heat works (which is only some of the time, the tempature is fine). If you could give me any direction on this please.

(hyperlinks removed - not allowed and please don't just copy your problems from other sites)

(This post was edited by Tom Greenleaf on Nov 4, 2012, 1:17 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2012, 7:49 PM

Post #2 of 11 (1346 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

You likely have some air pockets in the system. that engine is notorious for that. I don't believe you have ruled out a head gasket problem yet either. Another thing that engine is susceptible to. The reason it overheats when the heat is not working, it's because the heater core is full of air, not coolant.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



rgriffin087
New User

Nov 3, 2012, 7:54 PM

Post #3 of 11 (1337 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

Thank you for the reply but I did bleed the system so I don't think it is the air pocket problem. If it was a head problem wouldn't it be showing the normal signs white smoke, bad power, emissions in the coolant or coolant in the the oil?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2012, 7:57 PM

Post #4 of 11 (1333 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

OK, you be sure to post back with the real problem then.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



nickwarner
Veteran / Moderator
nickwarner profile image

Nov 3, 2012, 8:15 PM

Post #5 of 11 (1322 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

It does sound like an airlock. Sometimes you think you got it all and you didn't. I didn't see anything about the cooling fans. Are they operating properly?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2012, 8:19 PM

Post #6 of 11 (1319 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

His problem is worse on the highway so i don't see a fan problem. he's not going to listen anyway so he'll figure it out on his own.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



MarineGrunt
Enthusiast
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Nov 3, 2012, 8:44 PM

Post #7 of 11 (1311 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

After I did an intake on a our Chevy Venture it took me 4 days to completely bleed all of the air out of the system. I had pretty much the same symptoms until I eventually got all the air out.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 4, 2012, 1:26 AM

Post #8 of 11 (1295 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

Took out hyperlinks in top post as it's no doubt on every car site known. I understand these tricks from Windows 1895!


Hard to get air out of a system? Place vehicle on rear bumper to fill it or use vacuum filling machine,

T



Sidom
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Sidom profile image

Nov 4, 2012, 3:24 PM

Post #9 of 11 (1280 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

If you have access to a scanner, it would be a good idea to moniter the temp sensor for the comp to make sure you aren't dealing with an electrical problem with the gauge....


rgriffin087
New User

Nov 4, 2012, 3:31 PM

Post #10 of 11 (1272 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

I'm going to try and bleed the system again. Thank for the temp sensor advise that is something I hadn't thought of my insteument cluster has a short in it so maybe it's something electrical.


drivetech07
New User

Nov 6, 2012, 9:29 PM

Post #11 of 11 (1247 views)
Re: 1999 Cutlass overheating mystery no one has solved Sign In

The problem is likely the radiator. Check for an even temp across the whole radiator any noticeable difference and you've got a problem. Sometimes its hard to tell if the heat has time to soak the whole radiator so its best to check after the first thermostat opening on warm up.






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