A/C randomly gets cold when it wants to...bad sensors?
#1
Driver School Candidate
Thread Starter
Join Date: Jul 2014
Location: CA
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
A/C randomly gets cold when it wants to...bad sensors?
Please help, I did a search, but either my skills aren't too good to search or this is a 1st of its kind.
Bought a 93 SC300 last year (R-12). A/C was not cold, so I had it converted to R-134 and the mechanic filled it up.
A/C would have a random 10% chance of blowing cold, so I replaced the Magnetic Clutch Relay under the hood with junkyard relays. Also replaced the A/C unit with a junkyard one (I think from a 96, it has an orange screen) because my old LCD screen was bleeding/unreadable. I did the diagnostic test (holding auto on and recirculate) and got no codes, 00, so that is a good sign. I picked up a compressor from the junkyard, but accidently found out how to make it work.
So 2 things I found out:
1. A/C has a higher chance (I would say 70% of the time) of blowing cold air. It only works when I push Auto, but NOT when I hit the side arrow buttons (to turn on the fan) and A/C.
2. It blows at MAX, even if I tone it down with the arrow button, it doesn't blow slower/less. In order to do so, I have to turn off recirculate and put it in fresh air mode. It also doesn't beep when I hit any buttons. These 2 things I concluded was because I used a different/newer A/C unit.
My main concern is how do I fix this so that when I hit A/C, I will get cold air and not hope it will get colder? I'm thinking it has to do with the outside air temperature sensor or the auto a/c temp sensor? which one is which on top of the dash (left side/right side)?
Bought a 93 SC300 last year (R-12). A/C was not cold, so I had it converted to R-134 and the mechanic filled it up.
A/C would have a random 10% chance of blowing cold, so I replaced the Magnetic Clutch Relay under the hood with junkyard relays. Also replaced the A/C unit with a junkyard one (I think from a 96, it has an orange screen) because my old LCD screen was bleeding/unreadable. I did the diagnostic test (holding auto on and recirculate) and got no codes, 00, so that is a good sign. I picked up a compressor from the junkyard, but accidently found out how to make it work.
So 2 things I found out:
1. A/C has a higher chance (I would say 70% of the time) of blowing cold air. It only works when I push Auto, but NOT when I hit the side arrow buttons (to turn on the fan) and A/C.
2. It blows at MAX, even if I tone it down with the arrow button, it doesn't blow slower/less. In order to do so, I have to turn off recirculate and put it in fresh air mode. It also doesn't beep when I hit any buttons. These 2 things I concluded was because I used a different/newer A/C unit.
My main concern is how do I fix this so that when I hit A/C, I will get cold air and not hope it will get colder? I'm thinking it has to do with the outside air temperature sensor or the auto a/c temp sensor? which one is which on top of the dash (left side/right side)?
Thread
Thread Starter
Forum
Replies
Last Post
RaheelAmi
ES - 1st to 4th Gen (1990-2006)
6
05-26-14 06:31 AM