Those pressures suck. High side should be in the low 200’s, low should be around 40-45psi
AC insanity!! Help!!
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- #22
Is it possible to install it wrong?
I'm out of town so I can't look.
I'm out of town so I can't look.
I guess anything is possible, but if you’re capable enough to get it all together and know something is wrong, you’re probably capable of installing it. Based on *just your numbers? It’s low and has a restriction/blockage somewhere.
Your pressures are way off. It’s ok to load in the high side as a liquid after you’ve pulled a vacuum but not while it’s running. That’s a little too dangerous. Your compressor doesn’t sound like it’s working with the low side pressure at 100psi. Is the compressor new? What was your vacuum reading after you reinstalled everything? Did you verify your vacuum held for at least an hour? Did you replace your dryer as well?
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- #25
Yes to all of those. The ONLY components not replaced were the hoses (flushed) and amplifier (verified operating)
Thanks s lot!
Temps were 70-75. Typical socal morning.
My preference for sake of accuracy and ease of charging the system would be to wait until ambient temps reach 85° F.
Started with liquid in the low side. Which I think is NOT what the FSM calls for. Followed by liquid in tbe high side.
We will assume this was into vacuum (engine off)? You can liquid charge (into vacuum) from either side, but the high side is preferred. That way (high side) there is no danger of slugging the compressor with liquid refrigerant (which it can not compress). Any refrigerant introduced into the low side (as a liquid into vacuum) must first 'flash gas' before you start the compressor. Ideally....we don't want any (or very little) liquid refrigerant ever going into the low side while the compressor is running.
Is it possible that the low side is now "contaminated" with liquid when it needs to be vapor
Unlikely IF it has had time to 'flash' off and the ambient temp is sufficient. But don't liquid charge through the low side anymore.
and thus at ambient temp and not triggering the expansion valve to open because of the "high" temp?
The TXV bulb is filled with the same refrigerant (same for R12 or R134a) as you are using in your system, so it expands at the same rate (per temperature) which applies pressure against a diaphragm which moves the metering rod (a calibrated spring is used to control the travel and return the rod). The TXV seeks to control the superheat. Unless faulty (stuck open or closed, or sticky) it is not likely your issue.
The pressure switch is signaling so there is something in there and the compressor turns on but no flow.
Yes... your binary switch (combination low/high cut out switch) is working (at least the low side) or the compressor clutch would not be engaging. But we haven't yet determined that there is 'no flow' through the system. You've made an 'assumption' based solely on gauge pressures. There are some mechanical checks we need to perform. I think you are getting erroneous pressure readings on the low side because of hose/valve obstruction.
Wait that's all wrong I think
No, it's not ALL wrong. Most of it...but not 'all'.
We don't want to lose any R12 already in the system if we can help it, so let us know when you have time to get back on the project and we can go from there.
^^^^^^ expand for replies.
Are you positive the compressor clutch is engaging?
The expansion valve Denso specs for FJ60s (475-2006) is now R-134a, btw...
R134a w/R12 valve seems to work pretty well, but have never gone w/R12 in a 134 valve.
R134a w/R12 valve seems to work pretty well, but have never gone w/R12 in a 134 valve.
I ordered the original Denso expansion valve from Toyota part# 88515-20040 and dryer part# 88470-14010 which are both made to be used with R12. These parts are still available from Toyota. Which dryer and expansion valve did you order because they do make them for differently for r12 and r134a?
Whether or not the items are available separately does not suggest that one MUST be used over the other.
While I would not argue that a particular component (Expansion Valve or Drier) could be 'optimized' for a particular refrigerant, R134a and R12 are so physically and thermodynamically similar that components are generally considered interchangeable. R134a was designed to be a near direct replacement for R12.
R134a has a higher specific volume than R12, that is the chief difference between the two.
But if you compare the two pressure/temperature charts there is very little difference.
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- #31
Thanks Flintknapper!!
I’ll be back at it Friday.
I’ll be back at it Friday.
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- #32
Ok. Heading home today from Texas. Which is one of the reasons I’m trying to get this AC sorted. We will in all likelihood be moving out here and well, AC is kinda nice to have here.
I’m starting with double checking everything was installed correct. The mechanic who did the work is a great guy and he’s been very helpful and honest. But everyone makes mistakes so im checking.
After that I’ll flip out and then post back up here.
Any suggestions if I find all in order?
Thanks!
I’m starting with double checking everything was installed correct. The mechanic who did the work is a great guy and he’s been very helpful and honest. But everyone makes mistakes so im checking.
After that I’ll flip out and then post back up here.
Any suggestions if I find all in order?
Thanks!
^^^^^^ A/C is a 'Must Have' in Texas for a solid 4 months a year. You might not DIE without it...but you will wish you had.
Where do you plan on moving to in Texas?
Don't you know. ALL Californians go to Austin.
It is slowly becoming the San Francisco of Texas.
I grew up and went to school in Austin...but it has sure changed since I lived there.
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- #36
Dallas area.
And just for the record I'm not a "Californian".
Been there the last 18 years an have had enough.
And just for the record I'm not a "Californian".
Been there the last 18 years an have had enough.Awesome!! My daughter lives there and yes, it is becoming a little San Francisco. Actually, many companies move here to Texas for the many benefits that Texas has to offer for businesses. I’m a west Texan born and raised and enjoy the dry air out here. Welcome back!
Dallas area.
And just for the record I'm not a "Californian".
That's why you are going to Dallas then....instead of Austin.
Welcome to Texas, glad to have you.
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- #39
Thanks! Gotta get this AC fixed before I go!
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- #40
Ok. Got to the airport parking lot last night, poped the hood and did a thorough verification that all AC components were correct. (I spent my time on the road studying and obsessing on this)
Next step?
Suggestions?
Different mechanic?
This is the area I should probably stay away from. Dealing with somewhat hazardous chemicals and high pressures.
I'm fortunate to have some great LC specialists relatively close so may have to bite the bullet and turn it over.
Next step?
Suggestions?
Different mechanic?
This is the area I should probably stay away from. Dealing with somewhat hazardous chemicals and high pressures.
I'm fortunate to have some great LC specialists relatively close so may have to bite the bullet and turn it over.