ac blowing warm
#1
ac blowing warm
Hi everyone,
ok so when i start up the truck in the morning the ac work perfectly, blows nice and cold. id say about 10-15 minutes after im on the road, im rolling along at between 2000-3000 rpm and it starts to blow warm which really suck in Florida. but the thing is, if i downshift and keep it between 3 and 4 grand for a little while, the ac blows cold again. and so i go back and forth to keep the ac cold, lol. now i used one of the gauges that comes with those r134a cans and it said that the refrigerant was full (i think around 75-80psi, but im not too sure). so im not too sure if the gauge was wrong or if its something electrical.
also sometime the ac (whether blowing cold or warm) switches from the vent to the defrost. i looked through some of the post and they said something about a vacuum, but im still a little confused on how to take care of that.
any advice you all can throw my way would be just awesome.
thanks in advance.
ok so when i start up the truck in the morning the ac work perfectly, blows nice and cold. id say about 10-15 minutes after im on the road, im rolling along at between 2000-3000 rpm and it starts to blow warm which really suck in Florida. but the thing is, if i downshift and keep it between 3 and 4 grand for a little while, the ac blows cold again. and so i go back and forth to keep the ac cold, lol. now i used one of the gauges that comes with those r134a cans and it said that the refrigerant was full (i think around 75-80psi, but im not too sure). so im not too sure if the gauge was wrong or if its something electrical.
also sometime the ac (whether blowing cold or warm) switches from the vent to the defrost. i looked through some of the post and they said something about a vacuum, but im still a little confused on how to take care of that.
any advice you all can throw my way would be just awesome.
thanks in advance.
#2
#3
but as far as the air, its blown warm at slow speeds, on the highway, you name it.
#4
#5
Hmm. I guess i dont really recall if it happens on the highway or not.
Now that ya mention it, i recently replace a fan motor on a camry due to the ac blowing warm and it worked like a charm. Still, i didnt even think to check the fan clutch on the truck.
Ill also check to see if the compressor runs when it blows warm.
Now that ya mention it, i recently replace a fan motor on a camry due to the ac blowing warm and it worked like a charm. Still, i didnt even think to check the fan clutch on the truck.
Ill also check to see if the compressor runs when it blows warm.
#6
#7
First off what year is your truck? If you are a 94 or newer you are 134A refrigerant, you can buy a recharge kit with hose and gauge for about $20.00. Try one can and if that works you may have a small leak that is only present when the system is running. If it works problem solved if the problem returns put a can dye in and look for the wet spot. Chances are you have a bad o-ring on one of the hoses they can dry out and leak overtime.
#9
You said you have 75-80 psi in the system. I was hoping was a wrong value.
The low side should be between 20 and 30 psi when the ac is running.
If the compressor was dying it would make a terrible grinding noise.
Verify your low side pressure to determine if the system is correctly charged.
#10
yeah your definitely right Blhde, it does not blow warm on the highway. i guess i got it confused because it blew warm when i was stuck in traffic.
when i get home i'll recheck the pressure with the can gauge just to verify.
does that gauge measure the whole system or just the low side?
oh an thanks again for the help everyone, im confident ill have this all sorted out pretty soon
when i get home i'll recheck the pressure with the can gauge just to verify.
does that gauge measure the whole system or just the low side?
oh an thanks again for the help everyone, im confident ill have this all sorted out pretty soon
#12
Im not sure if you tested the radiator fan. With the truck hot and offf, try and spin the fan by hand. It should not be easy to turn or turn at all. Another way is too open the hood and with the truck running rev up the engine. The fan is very loud when its engaged it should move a lot of air.
Im really betting you need a new fan clutch. Now the efan mod is about the same price as the clutch. It will give you colder ac when your not moving, say traffic.
Im really betting you need a new fan clutch. Now the efan mod is about the same price as the clutch. It will give you colder ac when your not moving, say traffic.
#13
#15
#16
actually you're half right, it blows cold when im moving at above 3000 rpm. anything below that and it blows warm.
ok thanks, ill check that when i test the radiator fan
ok thanks, ill check that when i test the radiator fan
#17
Im not sure if you tested the radiator fan. With the truck hot and offf, try and spin the fan by hand. It should not be easy to turn or turn at all. Another way is too open the hood and with the truck running rev up the engine. The fan is very loud when its engaged it should move a lot of air.
Im really betting you need a new fan clutch. Now the efan mod is about the same price as the clutch. It will give you colder ac when your not moving, say traffic.
Im really betting you need a new fan clutch. Now the efan mod is about the same price as the clutch. It will give you colder ac when your not moving, say traffic.
#18
#19
the fan clutch was definitely bad so im glad i replaced it, but the bad news is that the air still blows warm at lower rpm. right after i replaced the fan clutch it blew warm less frequently but now its blowing warm just as much as before. is there anything else that i could check or anything else you guys think it could be?
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tbird2340
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06-18-2007 08:52 AM