Hi, 1992 RM wagon, 78,000 miles, no leak but hear a hissing and losing coolant, slowly.

Asked by Sep 14, 2018 at 11:49 PM about the 1992 Buick Roadmaster Estate Wagon RWD

Question type: Maintenance & Repair

My car doesn't leak anything. In great shape.  I noticed the temp gauge
going up while sitting in a parking lot.  I turned it off before it overheated.  
Added cooling and seemed fine for a while. Replaced radiator cap and that
seems to do it.  Now, reservoir level low, added water and after a drive 20
miles, nothing dripping that I can see or that is on the ground, but hear
hissing nosie. what can it be?

2 Answers


If you hear the hiss after you shut the engine off try this, turn heater off start engine and run for a while then shut it off, hiss gone? If yes thats the normal sound of the a/c system equalizing pressure and is normal you never listened that closely before, If the hiss is still there "burp" air from cooling system I hope this helps you


A small leak might evaporate before it drips onto the ground. I might go ahead and replace the radiator hoses and the radiator if the car is a keeper as the cost is not that high. You could try Alumaseal in the radiator to stop a pin hole leak.

Your Answer:

Buick Roadmaster Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealersTM


Related Models For Sale

Used Chevrolet Caprice
3 Great Deals out of 149 listings starting at $5,500
Used Mercury Grand Marquis
12 Great Deals out of 929 listings starting at $1,499
Used Lincoln Town Car
14 Great Deals out of 1,078 listings starting at $1,000
Used Chevrolet Corvette
384 Great Deals out of 14,533 listings starting at $2,900
Used Buick Park Avenue
213 listings
Used Buick LeSabre
885 listings
Used Cadillac DeVille
863 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.