89 S-10 Blazer knocking and hissing noise


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

1989 toyota pickup 3.0 crank no start

I have a 1989 toyota pickup 3.0 crank no...

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

89 S-10 Blazer knocking and hissing noise

Sign up here!

Search for (search options)

Auto Repair Home>> Truck Repair>> Truck Repair Advice

singlemom
New User

Oct 22, 2010, 11:52 AM

Post #1 of 3 (2663 views)

89 S-10 Blazer knocking and hissing noise	Sign In

1989 Chevy S-10 Blazer, (not sure about the L its 2 wheel rear drive if that helps) over 265k miles.

Before you look at the miles and decide, I have to say it ran great until this morning. I was driving down highway going about 65mpr when i noticed a faint noise. When i slowed to turn thats when something happened and the knocking started. I can't tell you what happened all I know is it didn't sound right and feel right. The knocking didn't stop when in idle or anything. I checked my belt no cracks or damage, checked fan it wasn't loose or hitting anything. I checked oil saw it was in need so put 2 quarts in. While doing this I noticed a hissing noise like air releasing, so I checked all hoses and caps everything looked in place. I turned the engine on and the knocking was gone but the hissing was louder (prolly cause the knocking was gone i was able to hear it clearer) and had a little bubbly sound to it. I took my blazer around the block and the knocking came back not as bad but was present and the hissing got worse. obviously my bro (who drives my truck more than I do) forgot to check and add oil. Other then the noise it runs fine. The hissing sound comes from behind the filter close to the winshield. I have no idea whats going on or where to look closer. Any suggestions and or point me in the right direction would be great.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 22, 2010, 12:14 PM

Post #2 of 3 (2655 views)

Re: 89 S-10 Blazer knocking and hissing noise	Sign In

That doesn't sound good. Running a car out of oil is almost always terminal. The knocking pretty much confirms that. You were on borrowed time with the mileage. Running it out of oil is a mistake it can't survive.

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

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.

Sidom
Veteran / Moderator
Sidom profile image

Oct 22, 2010, 12:44 PM

Post #3 of 3 (2649 views)

Re: 89 S-10 Blazer knocking and hissing noise	Sign In

I can't hear the noise but since the oil was way low, you better let this sit, cool down & check the coolant. It sounds like you were overheating & the more you drove it the worse it got.....

Don't try to take the cap off if it's hot & has pressure in the system. Feel the upper hose and make sure you can squeeze it together and there is no pressure. If it's rock hard let this sit for a few hours.....

Search for (options) Privacy Sitemap