The evaporator is straight forward on an 80, 45 minute job taking your time.
What are you working on? (23 Viewers)
- Thread starter crawlin40
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I just replaced both front calipers on my 80. Advance Auto, got 4 years out of them, got replacements no questions asked.
brian
SILVER Star
Cut the pipe, thread the pipe, goop up the pipe, install the pipe, next pipe…
Wow other than a color photo, it's like a time warp to the 1950s.
If the technology works…
Decided to dig into the A/C finally to try to figure out why I'm not getting a full cool even with the system charged.
Took me times 15 minutes to get the Evaporator box out:
Looks fairly clean inside:
And the evaporator itself still looks to be in good condition:
The low speed resistor not so much:
The expansion valve looks pretty clear as well:
So I'm a little stumped, it's an Auto AC system, and honestly haven't had too much experience with them since everything I've owned up till this truck has been a manual set up. I've ordered a new resistor and since I'm already in here a new thermistor (only $9) and the resistance test per fsm was a little slow to change.
The truck has 233k so I'm going to go ahead and install the parts I have. My next step is to look up the procedure to test the automatic air temperature sensor, however I feel it may be a "does it have power and ground? Yes, does the temperature change as desired? No, replace"
Took me times 15 minutes to get the Evaporator box out:
Looks fairly clean inside:
And the evaporator itself still looks to be in good condition:
The low speed resistor not so much:
The expansion valve looks pretty clear as well:
So I'm a little stumped, it's an Auto AC system, and honestly haven't had too much experience with them since everything I've owned up till this truck has been a manual set up. I've ordered a new resistor and since I'm already in here a new thermistor (only $9) and the resistance test per fsm was a little slow to change.
The truck has 233k so I'm going to go ahead and install the parts I have. My next step is to look up the procedure to test the automatic air temperature sensor, however I feel it may be a "does it have power and ground? Yes, does the temperature change as desired? No, replace"
Order up a fresh receiver dryer and some new o-rings...Decided to dig into the A/C finally to try to figure out why I'm not getting a full cool even with the system charged.
Took me times 15 minutes to get the Evaporator box out:
Looks fairly clean inside:
And the evaporator itself still looks to be in good condition:
The low speed resistor not so much:
The expansion valve looks pretty clear as well:
So I'm a little stumped, it's an Auto AC system, and honestly haven't had too much experience with them since everything I've owned up till this truck has been a manual set up. I've ordered a new resistor and since I'm already in here a new thermistor (only $9) and the resistance test per fsm was a little slow to change.
The truck has 233k so I'm going to go ahead and install the parts I have. My next step is to look up the procedure to test the automatic air temperature sensor, however I feel it may be a "does it have power and ground? Yes, does the temperature change as desired? No, replace"
Just getting to the re-assembly on my a/c project this afternoon. I'll post up some pics and results in a bit
@YotaFun your evap core looks similar to mine except I had whirlythings, leaves, hair and god knows what else packed into the bottom. I cleaned it up, replaced the expansion valve and buttoned it back up.
@YotaFun your evap core looks similar to mine except I had whirlythings, leaves, hair and god knows what else packed into the bottom. I cleaned it up, replaced the expansion valve and buttoned it back up.
Already done lol, I ordered everything but the lines and the compressor since the condenser looks rough
My evaporator had some debris, I cleaned it off, once I get my compressor dug out I want to see if the evaporator is clogged.
Quick update - I was able to get the a/c system back together yesterday afternoon. Here's what I did, replaced o-rings, shrader valves, expansion valve, ac rec/dryer, condenser (old one was leaking). For the most part it went ok - I broke a few bolts on the top brace and one on the a/c receiver dryer bracket but I'll come back to this later.
So I put the manifold gauges on yesterday afternoon and start to pump it down and I can't quite get to -25 on the gauge, concerned. I close up the manifold gauge valves to see if it'll hold a vacuum. It doesn't - WTF!!!!!
Imagine several hours of pulling gauges off and putting them back on. Checking my process online...watching another video. Reading more on MUD. Laying awake in bed turning the system over in my head.
Wake up today - walk out to the garage (fresh cup of coffee) double check the connections and notice this:
First one to spot the problem wins!
For a little background this is by far the most industrious I've been with my truck un-supervised. And I have no experience with AC systems prior to reading a few threads on MUD and watching YT videos... but this should have been obvious right?
So I put the manifold gauges on yesterday afternoon and start to pump it down and I can't quite get to -25 on the gauge, concerned. I close up the manifold gauge valves to see if it'll hold a vacuum. It doesn't - WTF!!!!!
Imagine several hours of pulling gauges off and putting them back on. Checking my process online...watching another video. Reading more on MUD. Laying awake in bed turning the system over in my head.
Wake up today - walk out to the garage (fresh cup of coffee) double check the connections and notice this:
First one to spot the problem wins!
For a little background this is by far the most industrious I've been with my truck un-supervised. And I have no experience with AC systems prior to reading a few threads on MUD and watching YT videos... but this should have been obvious right?
I should mention that it isn't the fact the valves/gauges aren't connected...
@Pacer for the win! These were rented gauges from autozone. My uneducated eyes completely missed the electrical tape until this morning. I returned the gauges todayand borrowed a NEW set. Hooked it up and immediately achieved -30 and it's holding a vacuum. Note to self - scientific instruments should not be held together with electrical tape.
Leave the vacuum pump running for as long as you like, hours or even during the workday. The low pressure helps any moisture in the system boil off.
See if they'll sell you, or give you that "broken" set of gauges when you return the NEW set. I have an extra good line and that's a nice set of gauges otherwise...
Good to know - I work from home so will let it run through the remainder of the day.
When it comes to adding oil - I've changed 3 components so it seems like the mud rule of thumb is 2oz per component or should I go strictly by the exact amount in the FSM? Also, I didn't add the oil to the components prior to reinstalling them - I saw in a video that you can add the oil to the yellow hose which will add it to the compressor and then cycle through the system. Any guidance or concerns on this thought process?
When it comes to adding oil - I've changed 3 components so it seems like the mud rule of thumb is 2oz per component or should I go strictly by the exact amount in the FSM? Also, I didn't add the oil to the components prior to reinstalling them - I saw in a video that you can add the oil to the yellow hose which will add it to the compressor and then cycle through the system. Any guidance or concerns on this thought process?
Pacer said:
Will do - seems like the least they could do for all the aggravation and driving around
Decided to address the sluggish power windows today. Cleaned the contacts on the driver's side control panel. This eliminated the studder/hesitation when putting the windows up. We'll see how it does once the temps get below freezing but excited in the improvement none the less.
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