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cooling fan runs constantly, a/c blows warm.
Hello. I have a 2005 Crossfire. Over the weekend i had to recharge the a/c system because it was blowing lukewarm. After I recharged it, the a/c then blew hot and the cooling fan now runs constant. I'm not rich and am hoping there is an easy fix to this. Can anyone help?
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Re: cooling fan runs constantly, a/c blows warm.
What pressures did you see in the system before and after your 'recharge'?
Keep in mind that MOST of the time the A/C blows warm/hot air, the A/C is fine and the duovavle is either stuck, or the connector is corroded, which means maximum coolant flows in the heater core - giving you, yes, hot air! Sounds to me like you goofed here, in charging a system that did not need it. And if the system DID leak down, you should be looking for the leak BEFORE you recharge. But I've driven several vehicles over 200,000 miles and NOT ONCE have I EVER recharged an A/C system. And yes, they all worked to well past 200,000. But getting to your point.... If the engine fan is running full speed, then: 1) Is the "low coolant" light on? (THis is a little radiator-looking light on the left side of the panel). If so, it sounds like the Fan Controller is in "emergency mode" - and I'd wonder why. (If this is the case, we can work on THAT....) 2) If the "low coolant" light is NOT on, then the PTCM is commanding the fan to run full speed - which implies to me that it sees something grossly wrong. Perhaps out of spec A/C pressure could cause this, I am not sure. |
Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by pizzaguy
(Post 870146)
What pressures did you see in the system before and after your 'recharge'?
Keep in mind that MOST of the time the A/C blows warm/hot air, the A/C is fine and the duovavle is either stuck, or the connector is corroded, which means maximum coolant flows in the heater core - giving you, yes, hot air! Sounds to me like you goofed here, in charging a system that did not need it. And if the system DID leak down, you should be looking for the leak BEFORE you recharge. But I've driven several vehicles over 200,000 miles and NOT ONCE have I EVER recharged an A/C system. And yes, they all worked to well past 200,000. But getting to your point.... If the engine fan is running full speed, then: There have been few AC failures mentioned here so I tend to doubt the symptoms have been read correctly. Does he mean the rad fan or the heater fan? |
Re: cooling fan runs constantly, a/c blows warm.
Right Dave. Also, I thought of something, if the pressure sensor in the A/C sees out-of-spec low or high pressure the system won't engage hte A/C clutch in, well, I THINK, all cars.
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Re: cooling fan runs constantly, a/c blows warm.
I think you guys have nailed it! I once did a quick recharge with the Walmart kit and got exactly this result. Then, I got the Harbor Freight AC servicing set up, and did it properly, VOILA, it works as new now. Another HF tool well worth having, as I have done all 3 of my cars, my brothers, and friends, with good results. This HF manifold connects to both the Hi and Low pressure valves and optimizes the pressure, whereas the Walmart type connect only to the low and often mucks up the system.
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Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by pizzaguy
(Post 870148)
Right Dave. Also, I thought of something, if the pressure sensor in the A/C sees out-of-spec low or high pressure the system won't engage hte A/C clutch in, well, I THINK, all cars.
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Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by dedwards0323
(Post 870154)
I agree with this comment. Nearly all auto HVAC systems operate with this built-in protection to prevent a compressor failure.
I'll think on THAT one a while...... :cool: |
Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by pizzaguy
(Post 870148)
Right Dave. Also, I thought of something, if the pressure sensor in the A/C sees out-of-spec low or high pressure the system won't engage hte A/C clutch in, well, I THINK, all cars.
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Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by JEFASOLD
(Post 870153)
I think you guys have nailed it! I once did a quick recharge with the Walmart kit and got exactly this result. Then, I got the Harbor Freight AC servicing set up, and did it properly, VOILA, it works as new now. Another HF tool well worth having, as I have done all 3 of my cars, my brothers, and friends, with good results. This HF manifold connects to both the Hi and Low pressure valves and optimizes the pressure, whereas the Walmart type connect only to the low and often mucks up the system.
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Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by jdoc3
(Post 870264)
Jeff, which kit did you get to correct this?
My name is Jim, JEF are initials but the kit is R134A at $59.95 and the air vacuum pump at $19.95 |
Re: cooling fan runs constantly, a/c blows warm.
Originally Posted by JEFASOLD
(Post 870302)
My name is Jim, JEF are initials but the kit is R134A at $59.95 and the air vacuum pump at $19.95
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