Where is the high pressure switch located on 1998 ford mustang base..?

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ttmus2222

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#1

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I am searching for a good diagram to locate the high pressure switch on a Ford mustang 1998 base convertible....

 

Noobz347

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"High Pressure Switch"? Please tell us more.

 

wmburns

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#3

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If we assume the AC high pressure switch it's located on the AC line towards the front to the right of the radiator.

 

T

ttmus2222

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Hello
My 1998 Ford Mustang base a/c is blowing hot air..I am using process of elimination to correct this problem..The clutch is moving smoothly during the recharge..I have located the low pressure switch and connector..I have switch out both and still no progress..which now leaves me with the high pressure switch on high side along with connector..Since the clutch and compressor are moving, I have eliminated the power connector on bottom of compressor...The next thing to do , I was told, to find the CCRM and fix the a/c relay...I located the relay, but I am not sure of the high pressure switch...Can you help me with any of those problems..???

 

T

ttmus2222

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Jun 7, 2018

#5

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ttmus2222 said:

Hello
My 1998 Ford Mustang base a/c is blowing hot air..I am using process of elimination to correct this problem..The clutch is moving smoothly during the recharge..I have located the low pressure switch and connector..I have switch out both and still no progress..which now leaves me with the high pressure switch on high side along with connector..Since the clutch and compressor are moving, I have eliminated the power connector on bottom of compressor...The next thing to do , I was told, to find the CCRM and fix the a/c relay...I located the relay, but I am not sure of the high pressure switch...Can you help me with any of those problems..???

Click to expand...

wmburns said:

If we assume the AC high pressure switch it's located on the AC line towards the front to the right of the radiator.

Click to expand...

 

T

ttmus2222

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Aug 17, 2011

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Jun 7, 2018

#6

• Jun 7, 2018

• #6

My 1998 Ford Mustang base a/c is blowing hot air..I am using process of elimination to correct this problem..The clutch is moving smoothly during the recharge..I have located the low pressure switch and connector..I have switch out both and still no progress..which now leaves me with the high pressure switch on high side along with connector..Since the clutch and compressor are moving, I have eliminated the power connector on bottom of compressor...The next thing to do , I was told, to find the CCRM and fix the a/c relay...I located the relay, but I am not sure of the high pressure switch...Can you help me with any of those problems.

 

T

ttmus2222

New Member

Aug 17, 2011

7

0

1

Jun 7, 2018

#7

• Jun 7, 2018

• #7

My 1998 Ford Mustang base a/c is blowing hot air..I am using process of elimination to correct this problem..The clutch is moving smoothly during the recharge..I have located the low pressure switch and connector..I have switch out both and still no progress..which now leaves me with the high pressure switch on high side along with connector..Since the clutch and compressor are moving, I have eliminated the power connector on bottom of compressor...The next thing to do , I was told, to find the CCRM and fix the a/c relay...I located the relay, but I am not sure of the high pressure switch...Can you help me with any of those problems.

 

wmburns

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Aug 14, 2009

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Jun 7, 2018

#8

• Jun 7, 2018

• #8

ttmus2222 said:

My 1998 Ford Mustang base a/c is blowing hot air..I am using process of elimination to correct this problem..

Click to expand...

Sigh......Load up the "parts cannon" and let the "part swapping" begin.

I can't help you with the "part swap" method of trouble shooting. IF on the other hand you want some help using a Volt-Ohm meter (VOM) to test a part before replacing it, then I might be able to help.

A reasonable priced budget VOM can be had for $20 ($10 if $$ is really tight) can be had with the money saved by not replacing a "good" part. This goes double where the CCRM is concerned as it's not a cheap part. The goal here is to test and replace a part only when we KNOW it's bad (or have a strong evidence).

Should you wish to step up to the "test first" trouble shooting method, using a VOM test for key on (AC on) at the low pressure (P wire). Use a known good ground.

IF no power, then the problem is upstream such as the AC mode control switch, fuse (I/P #6), wiring.

IF power then the problem is down stream. More tests are needed.

Note IF there's no power at the low pressure switch DB/Y while there is power at the Purple wire, then the low pressure switch is OPEN. Which means the Freon charge is low or the low pressure switch is bad.

 

Last edited: Jun 7, 2018

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ttmus2222

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Thank you so much...I am off to buy a Vom.....

 

Noobz347

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Jun 8, 2018

#10

• Jun 8, 2018

• #10

Do not be tempted to recharge your A/C with an off-the-shelf can if it is determined that your refrigerant is low.

 

Neuron

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#11

• Jun 8, 2018

• #11

Good advice, an acquaintance tried that with his Lexus and would have blown the system up if not for a high pressure relief valve in the system. R134a is not like the old R12, small changes in charge can make a big difference in the pressures.