Engine Won't Turn Over Due to Coolant Leak From Upper Intake Manifold on Buick LeSabre

The upper intake manifold may develop an internal coolant leak causing one or more cylinders to fill with coolant. This can cause the engine to "hydro-lock" and not turn over. Removing the spark plugs will allow the engine to turn over pushing the coolant out of the spark plug holes. Replacing the upper intake plenum and gasket is commonly required to correct this condition.

The engine can be very difficult to start after this problem has been repaired, it can be helpful to clear as much of the coolant from the intake manifold and cylinders as possible before reassembling the intake manifold.

RepairPal Verified
Average mileage: 126,560 (16,000–325,000)
7 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002
38 people reported this problem
17 people shared problem details
2001 Buick LeSabre69,500
coolant leak at upper intake. common problem with the 3800 engine. had repaired along with new hoses. total cost $785. Ouch) i dont know how gm avoided not recalling this problem. there are ten's of thousands of people that had this happen to them too.
2001 Buick LeSabre185,000
my car is using coolant its going through intake and out into the cylinders and being pushed out exhaust my buick under a load going uphill starts missing because of the coolant leaking into the intake manifold gas chambers causing multiple miss fires
1997 Buick LeSabre125,000
I have a 1997 model and just had the plenum which is the intake replaced. It wouldn't start and i told the mechanic there was antifreeze in the black tube going to the air filter and he said it was the intake. Its made of plastic and there is a metal pipe that exhaust heat goes through and melts a hole in the intake that allows coolant to enter the top of the engine. The part is around $130.00 or so but the total repair totalled $530.00. There was no knocking from the hydro-lock so we decided to fix it. Hope this was helpful..
1998 Buick LeSabre47,000
Coolant in all 6 cylinders
2000 Buick LeSabre79,000
leaking coolant, changed intake gasket
1999 Buick LeSabre58,000
Heater blew cold, engine overheated. Next morn low on coolant. Filled and started. It blew it out exaust then shut down and wont start.
1998 Buick LeSabre103,000
tech was doing a major tune up felt water and said the intake was leaking and needed to be replaced before coolant got in to cylinders he fixed it and no more coolant loss.
2001 Buick LeSabre112,000
Intermittent service engine light, need to top off coolant and oil between regular oil changes, check gas cap notice, rough start when cold , missing under load (slight incline with 4 persons in car. These symptoms are all intermittent but regularly occurring & makes the thought of taking a long trip worrisome & risky, being caught at mercy of mechanic that one does not know with downtime.
1998 Buick LeSabre130,000
I have a 98 buick park avenue that had a hydrolock, the engine light came on and off and the motor lost power, i pulled over, opened the hood and the radiator hoses were all collapsed, had to replace the seals on the head, it was over a $1000 to repair, I still am loosing coolant from the over flow
2000 Buick LeSabre130,000
same problem
2002 Buick LeSabre96,000
Overheated and lost coolant. Repair shop had it for 10 days and stated the car never over heated when he took it out driving. He said he put it on the lifts and couldn't find anything again. 2 days later the car had a smell and started smoking. I took it back and they said the intakes were bad from wear and tear?
2001 Buick LeSabre205,345
While my coolant system starting with the waterpump and then the radiator and then I was driving it and it ran hot and shut off and then. I got it towed. To my shop and next it like the coolant was flowing and then the coolant mixed with oil
1997 Buick LeSabre158,000
starter tried to turn over but it was not ,changed starter same thing , cable , nothing put breaker bar on harmonic and turned till it got real tight pulled one plug and pulled harder and it turned over , turned key and it cranked ok,sounds like it is out of time now no start, sugest not changing the starter try every thing else first
My gasket was deteriorated, replaced it & plenum - problem solved! Indications were adding a quart of oil between changes, adding coolant at every 1500 miles, missing/rough engine on cold start, missing noted under load, intermittant service engine light, milky gunk on dip stick. Cost was $465.00 at trusted private garage/mechanic.
1998 Buick LeSabre325,000
it wont start due too the problem of 1 or more of the cylinders filling with water. after putting a new radiator in. this problem came up. so guess to the scrap yard. t
1999 Buick LeSabre161,000
would not start
1999 Buick LeSabre70,000
filled collant tank up. ran engine to warmup. waited a few minites, restarted, blew noise cone off of starter. replace starter, dry out sparkplugs, replace uppermanifold.
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