reducing interior heat

[wa5ngp]

Hi Andrew,

I will make it a higher priority to do some shielding around the exhaust pipe under the tunnel. You are right that tunnel gets pretty hot.

my compressor is mounted on a huge braket in front of the mech fuel pump which has been removed. Is that where yours is? At what speed/rpm do you feel this vibration? It could be that your ac is overcharged? Can you measure the ac high pressure side while you are feeling the vibration to see if there is a correlation?

I just noticed that you are in Austin. I live off Parmer Lane West of RR and come into the Parmer/Mopac area during the week. How do you like this 105 deg weather?

don

[Inf]

My compressor is mounted where the old smog pump used to be. I yanked that thing out a few years ago, so it was an obvious place to mount it, and I think where the MSA kit is designed to fit.

I had a local mechanic install it two years ago, which I now regret. I wish I had facilities to do it myself back then, as I was not satisfied with the execution of their job after the fact.

I'm not even sure how to check the pressure, etc. Had I installed it myself, I would probably have a better idea.

The vibration is easily felt at idle, when the compressor kicks on, I seem to hear a low frequency rattling down near the drivers side footwell, as if the vibration the compressor adds is somehow causing some other part to vibrate.

Trying to accelerate with the compressor running is not smooth at all. There's the expected decrease in power, but on top of that the engine starts to feel very rough at RPMs over 3700 or so, so I generally shift before then because it feels and sounds awful.

This weather is ridiculous, but that's a Texas summer for you, and we've been through worse. The main thing I'm concerned about is our lack of rain. Lake Travis was down about 30 feet last I checked.

I'm living close to downtown now, in the Lamar/2222 area.

[wa5ngp]

Wow, if you feel that much vibration and loading I think that something is big time wrong. Maybe as simple as an overcharge and the pressure is getting way too high. Or you may have a clogged expansion valve or orifice tube depeending on what's in there.

I remember now the location, its the same location that they put ac compressors on the 280zx.

If you don't have ac experience, be careful there are some very high pressures involved and freon if let go suddenly can burn or blind you if it hit you in the face.

yes, Lake Travis looks just like a snakey river now.

don

[Unkle]

How about bypassing the heater ? It keeps the hot water / coolant in the engine bay . Just a thought .

[wa5ngp]

I thought about that one too. So far the control seems to keep hot water from flowing in pretty well. But its on my list once I tackle all the other high hitters . tks for the suggestion. Lately I've taken to moving that control on and off periodically just to make sure it doesn't get stuck. You know how it is in Texas. We don't need the heater much.