Hello Blazer forum members!

I am posting this thread for my father who recently has had some issues with his 1999 Chevy Blazer 4 door.

Background: The vehicle has 110,000 miles. It hasn't been used much for the past year or so and has been sitting in the backyard, only taken out once a month at most.

Now here's what happened.

While driving to go fishing today, he noticed that the car didn't want to shift into a higher gear when on the highway. After it stayed at higher rpms for a short while he realized something was seriously wrong. Steam began pouring from under the hood within a minute or so and he quickly pulled over to the side of the highway. The temperature gauge read nearly 260! Also coolant was squirting out of the hose near where it connects to the radiator! (There was that much pressure behind it!)
He had the truck towed home, added some water to the radiator and after it cooled down it started again. (No squirting coolant now though.)

Now here are the problems:

When revving the motor (not aggressively really, just 3-4,000 rpm) the engine makes a popping or gurgling noise when coming back down to idle. It almost sounds like a car running open headers. Also the noise level of the engine is considerably louder.

After taking a quick look under the hood, we noticed this:



This hose, at the front of the engine on the passenger side is completely burned away! Even the wiring harness was nearly melted!

After looking under the vehicle we saw the hose runs down to some other hoses, all of which are disconnected!



You can see those three hoses in the second picture.

Now, can anybody provide any insight as to what these hoses are for and what was originally there to connect them? The Haynes manual was no help and we wont be able to crawl under ourselves until the weekend (really bad weather here.)

My Dad thinks they may be vacuum lines but he can't be sure until he crawls under.

Side note: Yes we know those two oil hoses are leaking. They have a very very slow leak. Its on the list of things to fix soon.

If anyone could provide any insight on how these hoses were connected, etc. it would be greatly appreciated.

 

Do you have a rear heater/A/C unit? They look like heater hoes & a tee is missing. What diameter are they?
Yea the top hose is gone beyond a duct tape repair.

 

They could be for the optional A.I.R. pump that came on some of the blazers. Is there one on the left side too? I believe that the pump mounts at the bottom of the core support. It should be an electric pump. Good Luck

 

They are the secodonary A.I.R. hoses. The check valve on the passenger side failed allowing hot exhaust gasses to flow back through the hoses. The three hoses under the crank pulley are connected with a simple plastic tee fitting. The upper pic you will need a new check valve and 90* rubber hose elbow.

 

I too suffered a overheat problem a few years back in my 1999 4 door 4x4, but noticed the problem to late. my engine temp was 260 when I finally noticed after loss of power and high rpm. by then my transmission had overheated and burned out. After new transmission was installed my mechanic found that both cats were blocked which probably led to the overheat problem. Maybe that could be causing the popping and gurgling noises,