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Cadillac STS: Have a 1999 STS, Several months ago the radiator
Have a 1999 STS, Several months ago the radiator started to leak and we replaced it. After replacement in the passanger compartment the driver side air would only blow hot, although the passanger side… read more
Jerry Newton
Jerry Newton
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Vocational, Technical or Trade Scho
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Boggled by a '99 STS with a Northstar. Engine overheats. Back history: Radiator replaced. Month later, tensioner pully failed, car got hot QUICK. Shut down. Limped back. Replaced tensioner, burned upp… read more
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1998 Deville: his northstar is overheating..cooling system..fans came
1998 Deville My buddy came by last night and his northstar is overheating. filled the cooling system, started it up. fans came on at around 220 but temp did not drop (kept climbing). fans were blowing… read more
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Jerry
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Vocational, Technical or Trade Scho
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JOHN aka Eauto
JOHN aka Eauto
self employed
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97 sts: overheating..air pushing coolant out of resv preasure occurs
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David H
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Vocational, Technical or Trade Scho
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Deville: heater blows neutral tempSystem is pressurized..sys
1998 sedan Deville northstar Overheating Pulled thermostat since it seemed to be circulation issue, heater blows neutral temp System is pressurized. sealed sys., ? is an air pocket or radiator plugged… read more
JOHN aka Eauto
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self employed
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1998 Cadillac Seville: leaking..side plastic..car started to overheat
i have an 1998 Cadillac Seville STS. About two months ago the radiator was leaking on the side plastic in which I replaced the radiator. Last week while driving the car started to overheat. I loosened… read more
David H
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SEVILLE: CADILLAC..98..UPPER RADIATOR HOSE BECAUSE OF A HOLE
CADILLAC '98, SEVILLE STS. REPLACED UPPER RADIATOR HOSE BECAUSE OF A HOLE IN THE HOSE. REFILLED WITH 50/50 AND IT OVER HEATED. REPLACED ALL HOSES AND METAL COOLING PIPES. ALSO, REPLACED THERMOSTAT AND… read more
Mike Senary
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99 STS: litre..hoses..ac Off, then after a while it says check coolant
My 99 STS,4.6 litre is over heating, I changed the thermostat, because it was acting like the thermostat was opening and closing prematurely. There are no holes in the hoses, it holds the pressure, bu… read more
Dave Nova
Dave Nova
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2000 northstar V-8 140,000 miles.Engine overheats, loses coolant
2000 Northstar V-8 140,000 miles. Engine overheats, loses coolant from resevoir through cap. Cap is new. Have flused engine cooling system, replaced water pump and water temp. sensor. Have used Barrs … read more
Pete
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1997 deville: engine overheats, blows coolant..fans do work and come
1997 deville with 4.6 northstar. engine overheats, blows coolant back out the overflow. fans do work and come on when temp starts to climb and goes past normal. no coolant out exhaust and no steam. en… read more
brownjeff
brownjeff
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1997 Cadillac Deville: going down..leaks..pavement..driven..parked
1997 Cadillac Deville with Northstar engine. The coolant level keeps going down, but there appear to be no external leaks. No coolant appears on pavement under the car after it has been driven several… read more
Amedee
Amedee
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99 sts: runing..cap off and letting it cool all the way..way down
My 99 sts is losing it coolant... I have been puting coolant back in and am careful not to over fill it...puting coolant in and runing it up to temp... taking the cap off and letting it cool all the w… read more
Dave Nova
Dave Nova
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Associate Degree
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I have a 97 Cadillac STS with NorthStar V8. Car is in mint condition with
I have a '97 Cadillac STS with NorthStar V8. Car is in mint condition with 84K miles. I noticed the Low Coolant indicator and the car started running rough when first started, but smooths out within 1… read more
Randall C
Randall C
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Vocational, Technical or Trade Scho
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99 Cadillac DeVille: 54,000 miles..block test kit..head gasket..drove
I have a mysterious coolant leak in a 99 Cadillac DeVille North Star engine with 54,000 miles. I purchased a block test kit to check for head gasket leak. I drove about a mile until the engine tempera… read more
Dave Nova
Dave Nova
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98 Cadillac Seville SLS: Overheating..V8..water pump, head gasket
Engine Overheating!!! -- 98 Cadillac Seville SLS (4.6 L LD8 Northstar V8) Is this an issue with the thermostat, water pump, head gasket, head, block, etc? I have lots of background information so you … read more
Randall C
Randall C
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2000 Cadillac Seville SLS: Deville..Intake..water manifold..Exhaust
I want to know if a 2000 Cadillac Seville SLS 4.6 engine will swap with a 1999 Deville Concours 4.6? I looked at them side by side. I will have to use my valve covers, Intake & TB, water manifold, Exh… read more
John
John
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2 YEARS COLLEGE
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1998 STS: Northstar..4.6 will get a little hot then cool down
My 1998 STS Northstar 4.6 will get a little hot then cool down. I normally happens in the first three miles. Some times it will go the rest of the day normally. The temp will move up and down at ramdo… read more
Jerry
Jerry
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Vocational, Technical or Trade Scho
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Meet the Experts:

Jerry Newton

Jerry Newton

Cadillac Technician

1,738 satisfied customers

ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

Dave Nova

Dave Nova

Cadillac Technician

1,522 satisfied customers

ASE Master Certification. GM World Class Certification

Gm Tech (Cam)

Gm Tech (Cam)

Cadillac Mechanic

1,090 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

John

John

ASE Certified Technician

941 satisfied customers

ASE CERTIFICATIONS A1-A8 & L1 / 40 YEARS AUTOMOTIVE EXPERIENCE

Chris (aka- Moose)

Chris (aka- Moose)

Cadillac Technician

811 satisfied customers

16 years of experience

George H.

George H.

ASE Certified Technician

783 satisfied customers

ASE Master Tech 15+ Years

Don - Mo Lurch

Don - Mo Lurch

Cadillac Technician

705 satisfied customers

GM, Cadillac Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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