75 VETTE

[STEPHEN E. MUELLER]

HELP:

ON MY 1975 VETTE I HAVE A FEW TECHNICAL QUESTION'S

1) ON THE UPPER PASSENGER DOOR SHOULD THE ACESS PLate or the whole part to the acess plate be be painted semi-black?

2) Is there a part number (GM) for a luggage rack from that year(75)

3) On the AC, I am having trouble with the AC coming from the top two vents, I know there is no obstructions, any clues??

thanks

Steve Mueller

[John]

Re: 75 VETTE

I also have a 75 with a/c. I am a tech on commercial a/c. For two yrs. now I have been trying to get the a/c to work better in my C-3.

At it's best it is a marginal system. Airflow seems very slow even on high speed. My system has been gone over with a fine tooth comb and on high it blows as if it is on slow to med. in any other GM car. This is normal for C-3's no matter what people tell you.

I would start by looking at the blower motor and the resister to make sure the motor is running up to speed. Hot wire the motor straight off the alt. for a test. Check the duct work to make sure there are no leaks between sections. ( I found a leak on the heater core tubes under the car on mine. Someone left out the seal and I was loosing 50% of the air from there.) From what I read the duct work inside the car is to large in dia. and this adds to the slow airflow. Most GM's flow 300cfm and the vette flows 160 cfm. The ducts inside the car are also very restrictive because the dash is so flat.

Make sure the condenser is clean and the fan clutch on the engine is working properly. Charge the system correctly.

Next check to make sure the evaporator coil is free from debris. You can see the coil if you take out the resister block and use a light. You could have leaves blocking it. If so, remove the screen on the intake and if you have skinny, snake like arms you can reach into the box and remove the leaves and possibly flush the coil with a water hose.

I also would check that the a/c solonoid on the carb works properly. This helps when you are in traffic or the car idles .

I know this is lengthy but there is no other way to do it. I hope I have covered everything. I have done this to my car with good results.

Good Luck, John

[John]

Re: 75 VETTE

I also have a 75 with a/c. I am a tech on commercial a/c. For two yrs. now I have been trying to get the a/c to work better in my C-3.

At it's best it is a marginal system. Airflow seems very slow even on high speed. My system has been gone over with a fine tooth comb and on high it blows as if it is on slow to med. in any other GM car. This is normal for C-3's no matter what people tell you.

I would start by looking at the blower motor and the resister to make sure the motor is running up to speed. Hot wire the motor straight off the alt. for a test. Check the duct work to make sure there are no leaks between sections. ( I found a leak on the heater core tubes under the car on mine. Someone left out the seal and I was loosing 50% of the air from there.) From what I read the duct work inside the car is to large in dia. and this adds to the slow airflow. Most GM's flow 300cfm and the vette flows 160 cfm. The ducts inside the car are also very restrictive because the dash is so flat.

Make sure the condenser is clean and the fan clutch on the engine is working properly. Charge the system correctly.

Next check to make sure the evaporator coil is free from debris. You can see the coil if you take out the resister block and use a light. You could have leaves blocking it. If so, remove the screen on the intake and if you have skinny, snake like arms you can reach into the box and remove the leaves and possibly flush the coil with a water hose.

I also would check that the a/c solonoid on the carb works properly. This helps when you are in traffic or the car idles .

I know this is lengthy but there is no other way to do it. I hope I have covered everything. I have done this to my car with good results.

Good Luck, John

[Joe L.]

Re: 75 VETTE

Stephen----

With respect to the luggage rack, please understand that these luggage racks were not factory installed options. They were supplied from the GM accessories catalog and were installed either by the dealer's service department or the customer. There was a GM part number for the over-the-counter luggage rack kit, but I don't have it handy at the moment. However, it's really a moot point since these racks were GM-discontinued years ago. They are, however, available in reproduction. Although not original, I recommend the stainless steel reproductions since rust was a problem with "original" racks.

By the way, and at the risk of offending some, I would NEVER install one of these racks unless it was for the purpose of "filling the holes" which were formerly drilled in the rear deck panel to allow installation of a rack. If you have an intact rear deck area, I'd think LONG AND HARD before I'd drill it for a luggage rack.

[Joe L.]

Re: 75 VETTE

Stephen----

With respect to the luggage rack, please understand that these luggage racks were not factory installed options. They were supplied from the GM accessories catalog and were installed either by the dealer's service department or the customer. There was a GM part number for the over-the-counter luggage rack kit, but I don't have it handy at the moment. However, it's really a moot point since these racks were GM-discontinued years ago. They are, however, available in reproduction. Although not original, I recommend the stainless steel reproductions since rust was a problem with "original" racks.

By the way, and at the risk of offending some, I would NEVER install one of these racks unless it was for the purpose of "filling the holes" which were formerly drilled in the rear deck panel to allow installation of a rack. If you have an intact rear deck area, I'd think LONG AND HARD before I'd drill it for a luggage rack.