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The AC in my ’03 is not blowing cold.? The pressure is fine.? The fan does not come on when I put the AC on.? The fan comes on when the engine is hot though.

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If you have a troubleshooting flowchart that would be ideal.

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Thanks,

Bryan

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#163441

Usually one or both of the fan resistors (for the two fans you have) are burnt up.? P/n?701959263D.? If one is burnt up, the other is not long for proper operation either.? Replace both at the same time.? ?Looks like these are available in a lot of places.? If you know how to test a resistor you can confirm that the resistors are good (or bad).? Resistors are located at front of engine.? Have to remove engine lower cowling cover to access directly under the fans.? There are other things that can fail- fan relays, for example, but go for low hanging fruit first.? Be sure that the compressor is turning-? you can tell when you turn the engine on by the additional load.? ??

#163442

The compressor is not turning on at all. ?The pressure is fine, I checked it. ?1 resistor it turns out is bad, a new one is coming Monday. ?Not sure if the bad resistor keeps the compressor from coming on. ?I don’t know what the next diagnostic step is…

Thanks,

Bryan?

Show quoted text

On Saturday, July 30, 2022, 11:15 AM, mike.mcauliffe@... <99mcbear@...> wrote:

Usually one or both of the fan resistors (for the two fans you have) are burnt up.? P/n?701959263D.? If one is burnt up, the other is not long for proper operation either.? Replace both at the same time.? ?Looks like these are available in a lot of places.? If you know how to test a resistor you can confirm that the resistors are good (or bad).? Resistors are located at front of engine.? Have to remove engine lower cowling cover to access directly under the fans.? There are other things that can fail- fan relays, for example, but go for low hanging fruit first.? Be sure that the compressor is turning-? you can tell when you turn the engine on by the additional load.? ??

#163443

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The pressure is fine, I checked it.

The AC system had a high side and low side pressure, and you generally need to check both.

I'm attaching two PDFs - one is a generic for diagnosing things based on the high and low side pressures, and the other is a flowchart more specific for Sanden compressors (which is what my 2000 uses, not sure about the 2003 year)

Nissens_AC_System_Diagnostics_Poster_98x68+-+Operating+Pressures+R134A+-+ENG.pdf

SANDEN_SYSTEM_DIAGNOSIS_CHART.pdf

#163446

What is that switch called that controls the AC fan function?? ?I would look there first, test that if fan is not coming on.

#163447

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If compressor is not running, ? What is the pressure ?

Check switch on top tank on fire wall pass side, pull plug and check, there should be voltage on one side and other side to compressor clutch.

Show quoted text

On Jul 30, 2022, at 10:36 AM, B Feddish via groups.io <bfeddish@...> wrote:

? The compressor is not turning on at all. ?The pressure is fine, I checked it. ?1 resistor it turns out is bad, a new one is coming Monday. ?Not sure if the bad resistor keeps the compressor from coming on. ?I don’t know what the next diagnostic step is…

Thanks,
Bryan?

On Saturday, July 30, 2022, 11:15 AM, mike.mcauliffe@... <99mcbear@...> wrote:
Usually one or both of the fan resistors (for the two fans you have) are burnt up.? P/n?701959263D.? If one is burnt up, the other is not long for proper operation either.? Replace both at the same time.? ?Looks like these are available in a lot of places.? If you know how to test a resistor you can confirm that the resistors are good (or bad).? Resistors are located at front of engine.? Have to remove engine lower cowling cover to access directly under the fans.? There are other things that can fail- fan relays, for example, but go for low hanging fruit first.? Be sure that the compressor is turning-? you can tell when you turn the engine on by the additional load.? ??

#163448

On Sat, Jul 30, 2022 at 05:27 AM, B Feddish wrote:

The fan does not come on when I put the AC on.

Which fan, radiator or dash blower?? Also, is it manual or Climatronic?
--
Duane
05HD Rialta
220K Miles

#163454

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Sorry, I missed this question on Saturday.? The fans I was talking about are the 2 front radiator fans.? I have Climatronic.

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Thanks
Bryan

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Show quoted text

From: [email protected] <[email protected]> On Behalf Of Duane
Sent: Saturday, July 30, 2022 10:37 AM
To: [email protected]
Subject: Re: [eurovanupdate] Diagnosing AC

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On Sat, Jul 30, 2022 at 05:27 AM, B Feddish wrote:

The fan does not come on when I put the AC on.

Which fan, radiator or dash blower?? Also, is it manual or Climatronic?
--
Duane
05HD Rialta
220K Miles

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