I have a 89 Olds 98. I had a bad vibration when blower motor was running. Actually sounded like it was going to shake the dash apart. Anyways, I checked it out and discovered that a couple of blades on the blower cage had broke and threw the balance off. I went ahead and replaced both the motor and cage. As I was removing the old one I noticed that the plastic housing that the blower was mounted to had some cracks in it. I figured this was caused by all the vibrations that were going on. The blower seemed secured and I didn't think much off it this being my work car.(I know poor attitude to have) Well this morning I was tracing vacume lines because I've been having trouble with my air vents only blowing out the top and bottom as well my heater blowing only luke warm air. As I was doing this I noticed that this plastic housing was now missing big chunks and would break off in my hand if barely touched. The 90 degree hose that ran from the back of the blower to this housing was now gone. I could also see some sort of rusted metal inside this housing. I guess my question is this piece replacable or am I going to have to replace a bunch of other stuff along with it? I hope I desribed this well enough for you to know what I'm talking about. If not, I'm willing to run outside and snap a picture of it. Also,I didn't come across any visible leaks in the vacume lines and I dont have a tester for that. I was actually thinking adout replacing them all just to help prevent any future problems. Is there a kit that would supply me with all the vacume lines or do I have to purchase each one seperatly? Sorry for the long winded post.

Are you sure that those pieces aren't just an external cover to the metal housing?

I believe your seeing the insulator cover. This isn't a real big deal but does keep some of the engine heat away from the A/C. It's likely not even made any more. I wouldn't be too concerned about it.

As far as your vacuum lines, it's usually a supply problem.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.




78 Corvette Pace Car For Sale-18k mi orig-Florida

That external cover sounds about right. Thanks. As far as the vacume problem, I was thinking about getting a tester from autozone but was also considering replacing all the lines due to the fact they all seem kind of brittle. Just wanted to nip any future problems in the butt. About the luke warm air when heater is on. I've checked coolent level and quality and both are in good shape. Just had a flush a year ago. What else should I look for? That hose that is missing from the back of my blower, will it affect anything?

Yes, the missing hose will reduce blower pressure.

I would first get your vacuum lines situation straightened. Changing all the lines may be a bit of overkill. There are a lot of them. Try to isolate the problem area using a vacuum gauge so you can see where you have full manifold vacuum and where it's reduced. You can pinch off tributaries while watching the gauge to see if the vacuum level responds to pinching off one line to isolate where the leak is. If you find some line that just keeps breaking, then replace that section.

Once you have those problems fixed, get the car up to operating temp and feel the temp of both heater hoses. If they are both hot to the touch, then you have an internal blend door problem. If one hose is hotter than the other, then you have a plugged heater core and it will have to be replaced.




78 Corvette Pace Car For Sale-18k mi orig-Florida

O.K. Will do. I will try to make time for this project this weekend. I'll let you know how it goes if interested. Thanks for all the great ( and free ) advice.

Your welcome

Be sure to post the results when you get them for other people to read.




78 Corvette Pace Car For Sale-18k mi orig-Florida