Our AC system SUCKS

resistors , A potentiometer is nothing more than a variable resistor. there are 4 positions and 3 resistors on the fan circuit now.

the reason the resistor is not in the dash is because of HEAT, it will self destruct over time. the blower resistors are in the blower case and cooled by the air flowing over it ( and they still burn out)

Reinvent the wheel and let the rest of us know how to do it

 

That is more or less how I remember it as well.

 

Yes, the resistor gets hotter than blazes and they put it directly in the air stream to help cool. If you remove it there is a cutout where the ceramic part protrudes into the fan's air duct downstream from the fan. I have peeled the skin off my fingers reaching back in here and accidentley touching the hot resistor.

 

A company made a lot of money when we were forced to switch from R12 to R134A.. coughDupontcough.

 

know anyone who uses or has used aerosol propelled inhalers for asthma ? wanna guess what the propellent was up until early '00 ? and after that until they developed dry power inhalers ?

R12 was used as part of the treatment and propellant and then they redeveloped the dose and used R134a which had a bad taste at first, they worked that out. Now most aerosol propellent inhalers are defunct and dry power is used.

 

no way they could be behind this latest change out, that would be unethical......

 

Not the first time, doubt it will be the last time...

 

There is a shortage of slickness these days so it may look a bit Micky mouse.

 

Checked the price of R22 lately?

 

I've tested this myself. I agree. But, if you block the airflow the amps drop but the motor gets hotter and hotter and the amps go up. Keep going and the motor will burn up.

 

Dig up sources that say ozone depletion is not a naturally occurring event.

 

I thought I would park this here since the thread is about poor cooling especially when at idle. I have had the entire HVAC box apart, and I mean every small and large piece. There is no regulation of the hot water that flows to the heater core such as you will find on older vehicles. The heater core also site immediately adjacent to the AC evaporator core.

The air flow goes like this:

Air inlet to cab >> fan motor >> duct to AC evaporator >> heater core >> blend doors >> duct works.

So the heater core has engine-temperature coolant flowing through it all the time. Its seems a bit inefficient to first cool the air through the evaporator and then heat it again through the heater core. I wonder if a valve could be used to reduce or shut off the hot water flow? Or perhaps it is leaks in the blend door seals themselves?

 

Good point, where does that hot air from the heater core go?

 

I made no claims either. And I'm not reading internet stuff. I can't prove anything one way or the other. We just have to live with what we have.

 

I'm going to add to this. In '95 when R12 was starting the phase out, I was required to find and fix a leak, no matter how small. But! a large system like you might see in a supermarket could leak up to 50 pounds a year and no repair was required. Sound kosher?

 

It seems to go to the cold air from the evaporator. At least that is what it looked like when I had it apart. Otherwise there is no outlet from the HVAC box where we find dumping of hot air to the outside

 

Okey doke. Not gonna argue, no point in it.

 

Not a damned thing.

 

There is a valve. If you don’t call for heat. Hot water doesn’t go to the heater core. It is bypassed.
When you do
Call for heat the valve operates sending engine heated water to the heater core. Unless it operates differently than any of my other vehicles, as I haven’t delved in my taco heat system as of yet

 

Where is this valve? I know what you mean about older systems, but Tacomas don;t have a water valve, do they?