Hot A/c

[arts164]

Steve... I would like to eliminate the heater as you have shown. I have unplugged the electronics to the stepper motor on my '92L. Blows cool, not cold high seventys. Big deal here in Naples (already). What diameter heater hose are we speaking of, my parts man is asking? Will the stoppage result in less water circulation for engine cooling? Am I being too lazy in not wanting to tackle the stepper? I never use anything but the A/C! Thanks in advance. I enjoy your enthusiasm.

[ChazzyD]

Quote:

Originally Posted by Alfisto Steve If the arm moves and it not broken free from air door inside blower motor housing and moves to close door to prevent air flow to heater core sytem should cool down. There isn't any shut off valve to stop engine coolant from circulation through heater core. Coolant always flowing so door has to prevent blower motor air from passing over heater core and into a/c dusts. Either stepper not shutting door open off entirely or door linkage is broken inside blower motor housing. The easiest fix is to install a manual shut off valve in hose from engine to heater core right at false firewall. Here is a picture of one installed on a 1995 24v LS (AFM hose etc removed as we are doing a cam timing check on car).

[BlackAlfa]

Here's what I have in our green '91L:

[ChazzyD]

Now that's an interesting config. but how do you determine what valve to open and which one to close and for what purpose? The one going to the core I understand because that is what I did today but what is the other valve for? The tee going to the tank line makes sense because the coolant would than flow to the rad return line.... OK, I get it, when you close the line to the core, you open the line to the return line to keep coolant flowing. When you open the line to the heater core, you close the line to the crossover and it works like the stock config. Brilliant! Do you really need the crossover though? Most stock configs have a heater valve that closes automatically (with the climate controls) and does no harm, but do they normally divert coolant to return as your config does, or just shutoff the line to the core? Wish Alfa had gotten this one right to begin with, really one of the most REALLY unexcusable things on the car, IMHO. And yes my flapper (stepper motor) is working, I checked. Thanks for the pic. Just went to get some gas and nice cool air flowing through the vents (A/C not working right now so I REALLY needed ambient air and not heated air, next project) :rolleyes
P.S.-Went to replace the hose from the bottom of the coolant tank to the rad pipe, well, it is not 3/4" hose like the (to) heater core line - something a little bit bigger, uff da!
Charles
'91 164L 5 speed
Chattanooga, TN

[BlackAlfa]

Quote:

Originally Posted by ChazzyD OK, I get it, when you close the line to the core, you open the line to the return line to keep coolant flowing. When you open the line to the heater core, you close the line to the crossover and it works like the stock config.

[Lancisto]

Quote:

Originally Posted by Alfisto Steve The easiest fix is to install a manual shut off valve in hose from engine to heater core right at false firewall. Here is a picture of one installed on a 1995 24v LS (AFM hose etc removed as we are doing a cam timing check on car).

[407driver]

NAPA is where I git mine.....3/4" fittings. same as Steve and I am now getting 38 deg. from center vent with R134, the temp decrease is dramatic when the heater core is denied supply of hot water.

[Lancisto]

Thanks!

DJ

[ke3ee]

So the single valve Murray 84707 like Steve has which I bought goes in the line from the head to the core ? the line with the small line running off of it ? Not to the coolant bottle correct ? I checked my AC this morning with the car cold, Freon level and pressure is good on the gauges and she blows good and cold so it must be when she warms up the core is hot...

Well after staring at the other photos I hope thats it. its installed and the AC is cold. As an added bonus while I was working UPS showed up with the replacement hood struts so now I dont need a block of wood to keep the hood up.

Now to take that dumb clutch damper out. I received the new hose and slave from jason yesterday just in case.

[Alfisto Steve]

Don't you just love it will more than one plan comes together at the same time? Cold a/c certainly welcome now. Looking at 99+ tomorrow here.

My son brought back my 93L Rosso tonight and drove off in his S with new blower motor and S muffler in his trunk for his L.

Now if he can just get new fuel pump working on his Maser Biturbo.

Eyetalin cars do keep us on the move to the tool box.