a/c blend door on a 1995 chevy truck

What did you want it to blow? What did it blow before, or did it?

If it is 100 degrees outside 40 degrees is fine.

Do the hoses feel differently, one hot, one cold, under thee hood?

Where are you???????????

Im in California . It only blows cold when the heater hose lines are blocked going to the heater core. When they are not blocked it only gets to 60. there is a problem somewhere with the blend door or something not closing off the heat

had the problem on my 94 stealth..

...the shop took 1/2 day to do it..

nomenclature of the unit escapes me.. but it was about 1/3 the cost of a heater core replacement for my car ..

my 2 cents

OK, you said you did some A/C work on it. Was the system working OK before you worked on it? If there was an A/C performance problem, did it gradually decrease in performance or suddenly go into failure mode?

Can you tell us what exactly you did in regard to A/C work? After the repairs, did you monitor the performance with a manifold set or A/C machine attached to check the system pressures?

You say the blend door motor "seems" to be working fine; it is properly adjusted? Many of these GM models have adjustable door linkages. You need to verify that the doors are moving through their full range of travel. Also, many of these systems use vacuum switches; you need to verify if the system is getting and holding vacuum. Do you have good airflow through the condenser and evaporator (no trash or debris clogging the exchangers)? Does the vehicle maintain proper operating temperature (engine temperature) when operating?

It seems that you may have a blend problem, or the A/C is not getting quite cool enough. A good system should blow in the 30's F when properly working.

Update us when you have further information or solve the problem.

in all probability the urethane (gray) foam edge seals have crumbled away on all the heater control doors. I suggest installing a simple cable controlled heater control valve in the hot water supply pipe. This would enable you to maximize A/C performance while retaining full control over the heater performance when needed.

Back when your truck was designed, no one really cared about fuel economy. The A/C system operated at maximum capability as determined by blower speed of course- and the air is reheated by directed some air through the heater to control the temperature. Very ineficient, but very simple and reliable. Chrysler varied the hot water flow through the heater. My first car (1964 Chevy Impala 2 door Convertible-red with white top, red leather interior, 327 4 Bbl HO engine, AT, PW,PB,PS, Power locks,Power top, A/C) --used a suction throttling valve on the A/C evaporator to control the temperature. Never added any refrigerant, never required any maintenance, would freeze you out (South Louisiana heat and humidity) and was undiminished in performance when the car was at 15 years and 175,000 miles, totaled in a wreck with a 2000 #Bramah Bull sleeping on the highway .. That ultra-reliable R-5 compressor would cool a good sized house.

Never understood why they abandoned that excellent system for the blend door, cycling compressor and the horrible radial compressor crap in later years.

Thanks for the replies. I found the problem already though. The blend door actuator had a cracked gear inside the casing, only allowing the door to partialy close. the gear was binding inside it took me a while but I found it .

Right on!

Hi, Well you are now stuck with a common problem, first if the Freon cycle is proper, correct evacuation procedure and peoper Amount of Freon and oil in the System and new dryer and Orriface the one thing that is due to Time is that all the Doors and the Evaporator Seals are a form of " Foam" insuation and that after 14 years or less it degades and is blown out through the vents, somtimes can be seen but most of the time is not. What it would take is to remove the entire dash and dissasemble the HVAC Box and replace the Foam. I see this everyday in my repair shop and as an automotive technology Instructor. I hope this helps.