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2004 Lincoln town car, ac takes 15+ minutes to get cool, once cool it stays pretty cool, here is what I have done, added Freon and that did nothing, replaced the AC clutch relay and still nothing, i was told it could be a possible blocked orifice tube so I went and bought one along with new Freon, I rented the vacuum and gauges and proceeded to take out the Freon, open the line and replace orifice tube ( the one I pulled out was pretty clean) shut the line and hooked up the vacuum to the lines, I vacuumed it for about 15min getting it down to 25 in the green, shut the valves and let it stay there for about 10-15min and still no change in the gauge so I don't have a leak anywhere. I began to add the Freon it would take a little and then STOP... my compressor was not kicking on, waited the normal 15min that it usually takes to cool off and the compressor started to click on and off while taking the Freon, proceeded to add 2 more cans (total 32oz as stated in the manual) and the compressor stayed on. So what could be causing my system to take so long to get cold? why is the compressor taking a long time to kick on?
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Originally posted by DOHCTR -
Is the evaporator core clogged? Texas dust and those do not get along well. -
What is the vent temp on max ac after 1 min after startup?
Sent from my SAMSUNG-SM-N920A using Tapatalk2015 F250 PlatinumComment
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how can I check that without draining the Freon again?Originally posted by Scott Mc View Post
Originally posted by DOHCTRComment
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ok so I took a infrared thermometer out there and aimed it straight into the ac vent and on start up it was about 95ish, it went all the way up to 101 until the ac began to get cooler which was a lot faster than usual but still about 8-10min, once it did then the reading went down to 63
Originally posted by DOHCTRComment
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You may, it is located in the HAVC box. Try to get access to power wash it first.Comment
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How about dew points in the high 70's. Your A/C
works so well it is freezing the evap.Comment
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but if anything was clogged wouldn't it not blow cold air at all?
Originally posted by DOHCTRComment
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If the evap is dirty, it can freeze over. Then, once it unfreezes you'd get cold air again. I've experienced this more in home systems with dirty filters/coils.
A few things to note.
1. Pull vacuum for atleast 45 minutes to an hour.
2. Use a graph with outside temp, hot and cold side pressures, and vent air temps when refilling. Unless, it's a fresh system or you know there's no leak or loss of oil.
3. If a system holds vacuum, it doesn't mean it will hold pressure when filled. I tested a reman compressor and it held vacuum for over a day, only to leak out an o-ring a few days later when pressure tested.
Can you get a hold of some gauges again?Comment
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Yeah I can go back to auto zone and rent them again, that's no problem, what do I need to do?
Originally posted by DOHCTRComment
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But wouldn't my lines freeze over too like the house a lines??
Originally posted by DOHCTRComment
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automatice temp control on the dash? As in, you set the temp to 63 degrees?"If I asked people what they wanted, they would have said faster horses." - Henry FordComment
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Do a search for, "car ac compressor clutch cycle timing".Originally posted by bonnie&clyde View Post
Another for, "automotive ac pressure chart".
Combined they should point you in the right direction.
Edit- This link might have it all...
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