Air Condition problem.

[AbrahamSVT03]

Hello guys.

I got a question , about the A/C on my 03 cobra.

The problem that I have is that the air conditioning is not working properly , what happen ? I was on the street with the A/C On , and was on a red light , I just heard some noise like if a hose were broken and I just saw a little cloud on the passanger side wheel and I felt that the A/C was not cooling as it was, Then I just shut down the A/C.

Some minutes later I turned on the A/C again and some minute later it did the same thing , and I felt the air inside the car same as the temperature on the outside , so I took it to an A/C specialist , and asked me if I saw that my car was overheating and I told him that no , the temperature in every moment that I was on the car was always behind the half on the gauge of the temp, he told me that probably my car was overheating and the air compressor release the excessive temperature by a relief valve on the compressor and that why I saw a little cloud on the floor , that was my A/C gas coming out from the valve and that why I felt my A/C was not cooling properly.

The thing is that the guy washed my H/E , my Radiator , my A/C compressor , checked my fan and he re-charged my A/C gas , and it was working good , but at the next day I did the same thing , I checked my temperature and was always in the middle even not on the middle , a little bit before the middle on the gauge.

So I wanted to ask you guys if anyone has any idea whats happening ? my car is always running in good temperature and I don't know what could be happening, so thanks for any responses.

Good luck.

 

[MG0h3]

I dont have any experience working on AC systems. Never heard of one blowing off like that from overheating so Im in for info!

I could see it happening if the clutch isnt cycling and the pressure gets too high.

 

[big dad]

First off, turn your A/C on and see if the cooling fan comes on, it should. If it doesn't that's a good place to start.

 

[AbrahamSVT03]

I dont have any experience working on AC systems. Never heard of one blowing off like that from overheating so Im in for info!

I could see it happening if the clutch isnt cycling and the pressure gets too high.

Thanks ! that guy actually checked everything and said everything was fine , with the compressor condenser , everything , he was measuring the temperature and I think I went up to mmm cant remember maybe 200 psi or so , because the heat the released the pressure , but the engine temperature was always at normal temp , I don't know what could be happening and like 6 months ago I did a maybe 500 miles trip and the A/C was working pretty good , don't know what happened

 

[AbrahamSVT03]

First off, turn your A/C on and see if the cooling fan comes on, it should. If it doesn't that's a good place to start.

Thanks for the tip but I already did that , the fan was entering at 180 degrees I think and with my SCT tuner I set it up at 170 degrees and enters at that temperature , the only thing that I notice is that it enter just with 1 speed , Im not sure but maybe our fan has 2 speed , the low and the high speed right ? I think I just saw it in 1 speed.

But the fan entered and cooled down the engine and turned off , didnt gave a change to the engine to overheat

 

[SnakeBit]

When the AC is on, the fan should be running. Coolant temp doesn't matter, the fan should be on.

 

[big dad]

When the AC is on, the fan should be running. Coolant temp doesn't matter, the fan should be on.

Thanks for mentioning that, I should of been clearer with that in my post.

 

[SnakeBit]

Thanks for mentioning that, I should of been clearer with that in my post.

Yeah, looked like he didn't understand what you meant. :beer:

 

[AbrahamSVT03]

Yeah, looked like he didn't understand what you meant. :beer:

That's true I didn't understand xD , I tought u meant that if the fan came in when the temperature goes up, But noup , my fan doesn't start when I turn on the A/C.

So my fan should start when I turn on the A/C ??? no matter if the engine temperature is low ?

 

[big dad]

That's true I didn't understand xD , I tought u meant that if the fan came in when the temperature goes up, But noup , my fan doesn't start when I turn on the A/C.

So my fan should start when I turn on the A/C ??? no matter if the engine temperature is low ?

Yes it should. If it doesn't come on the A/C pressures will build because the heat is not being drawn out of the condenser. When they reach (pressures) high enough the pressure relief valve on the compressor will open and vent to atmosphere to prevent catastrophic damage in the system. Who ever serviced your A/C should have known or checked that. This is an electrical problem involving a sensor in the system or a wiring problem.

 

[AbrahamSVT03]

Yes it should. If it doesn't come on the A/C pressures will build because the heat is not being drawn out of the condenser. When they reach (pressures) high enough the pressure relief valve on the compressor will open and vent to atmosphere to prevent catastrophic damage in the system. Who ever serviced your A/C should have known or checked that. This is an electrical problem involving a sensor in the system or a wiring problem.

Thanks for the answer , then if it doesn't enter the high speed fan when I turn on the A/C , it could be that a fuse or a relay is bad ? or has nothing to do with the fuses and relays ? its specially with the CCRM ?

Thanks man

 

[big dad]

Thanks for the answer , then if it doesn't enter the high speed fan when I turn on the A/C , it could be that a fuse or a relay is bad ? or has nothing to do with the fuses and relays ? its specially with the CCRM ?

Thanks man

You've got the general idea down, now check all the fuses under the hood in the power dist. box. Then try unplugging the A/C high pressure switch located on the R/S front by the radiator and core support, if the fan takes off on high that is probably the problem, if not the CCRM is the problem. I just went through my EVTM I acquired when I was still a tech. and that's how I'd go about pinning it down. Let us know what you find.

 

[AbrahamSVT03]

You've got the general idea down, now check all the fuses under the hood in the power dist. box. Then try unplugging the A/C high pressure switch located on the R/S front by the radiator and core support, if the fan takes off on high that is probably the problem, if not the CCRM is the problem. I just went through my EVTM I acquired when I was still a tech. and that's how I'd go about pinning it down. Let us know what you find.

Thanks again for your answer, and ok I just checked every fuse on the fuse box under de hood , and all of them are ok , there's no fuse in bad condition , next step , ill do what u said about the high pressure switch, Im just looking information about that switch cause I don't know where is it xD lol.

When I find it , I let the A/C on , On Max and I just unplug it and I should see the fan comes in , in high speed ?.

BTW im thinking about taking the CCRM out and check it by myself , I think that on the inside it has some relays and those things right? maybe wont be an issue trying to repair it :s

 

[big dad]

See my previous post about the location of the Hi-Pressure switch, it should have 4 wires on the connector. As far as the CCRM is concerned that's a sealed unit and not serviceable, just replace it.

 

[AbrahamSVT03]

See my previous post about the location of the Hi-Pressure switch, it should have 4 wires on the connector. As far as the CCRM is concerned that's a sealed unit and not serviceable, just replace it.

Thanks, yep I saw the previous post, but let me search it and I tell you what happened.
And yep I know that its a sealed device, but like a year ago I had some issues with the clutch of the A/C. and was the CCRM again , so I take it to some technicians and repair it , but analyzing the anatomy of the CCRM is not complicated I don't know if I could do something xD

Thanks again for your answer and once I check that switch ill let u know.

 

[hotcobra03]

Ac issues bite...

Here is something to try. ..I have been having ac issues for a couple years maybe similar. .

I have thermometer in vent...ac when car is cold will go to 40degs..

When car gets to temp ac goes up to 60deg..it will drop only with fan on low..

problem ive read was maybe blend door..if air comes out defroster vents than door is opening when it should be closed mixing hot and cold air

The vacuum actuator is in center of dash and dash has to be pulled back to get to it..

another thing...cooling fan not up to speed?

If I get car hot ac blowing 60deg..and put garden hose into grill ac goes to 40deg..

my car has original radiator and 8yr old motorcraft replacement fan..

I can hear 2 speeds and see it change on handheld watching temps..

I havent changed any thing yet other than ac compressor for a leak

 

[AbrahamSVT03]

Thanks hotcobra03 , I should check that too.

Well so yesterday , I found the high press switch from the A/C. I put the A/C at max and and the fan didn't started , I disconnected the switch and no changes , the fan was not working.

So I can lead to the CCRM right? maybe its bad , everything that controls de CCRM , a/c clutch, fuel pump, etc is working good , just the high speed fan doesn't come in and doesn't start when I turn on the A/C.

Another important thing that I haven't mentioned, is that the past owner installed and additional fan , a little one infront of the radiador , on the opposite side of the bigger fan , that fan starts when I turn on the A/C. I don't know why he installed but it just works when I turn on the A/C. it has its own relay.

What could I do ? replace the CCRM or use that relay if I could connect it to the main fan? I cant say if it will work on high speed , or will just start working with the A/C on.

 

[hotcobra03]

Have you downloaded service manual yet..it has all the info needed to track down issue..

There are 2 on site to down load

 

[AbrahamSVT03]

Have you downloaded service manual yet..it has all the info needed to track down issue..

There are 2 on site to down load

Noup I haven't, right now I cant download it , cause im on the net of my work and it has so many pages blocked xD so ill try to download it when I get home

 

[humbro19]

Love reading this stuff but I've got another one for you all. You might not be able to help, and I might not be able to answer all the questions you need answered to help but it never hurts to try. I have a 98 Cobra that has been Terminator Swapped. The PO did the swap so I'm chasing his issues. Here's my problem: The blower and temp controller works in all positions but the other one is completely jacked. The only positions that work are the FLOOR and the VENT but never changes from actually working in MIX except for when placed to OFF. Here is were it gets nuts and looses me completely, when placed in either of the A/C positions or in VENT it kills the engine and will not allow it to restart until placed back to OFF or one of the other previously mentioned somewhat working positions. And...............Go!