The original compressor on this '01 4x4 front & rear system has stopped working. I want to bypass the relay to see if the compressor runs. Is it easier to access the relay from underneath the truck looking up or by moving the windshield washer reservoir?

 

Yes.

 

Thanks for the reply Jim.

Can't wait to lie on the ground tomorrow. At least it will be a quick check.

 

I bypassed the relay by jumping the connector. The compressor started up. Does this relay fail ordinarily or has a compressor problem caused it to fail?

I plan to install SMP relay #RY319 unless otherwise advised.

 

Before spending the money, I have ask... Is the suspension light on in the dash?
Did you reset the air compressor button under the passenger side dash?

I believe the 01's are set up the same as the 99's.

That relay isn't cheap!

 

Check suspension light is not on. I'm unaware of a compressor reset button. Where is it located under the passenger dash exactly?

 

after my 2nd relay, I replaced the air ride suspension
for less than it would have cost to fix it. 99 EBExpy

Relay goes out because:
1. it cycles too much due to system leakes
2. motor runs too much causing it to wear out and require more amps to run...

Such a vicious cycle....

The air ride suspension switch is located on the passenger side, above the kick plate, in the corner, out of sight

 

I'm familiar with the switch. Gotta use it every time the truck goes on the lift. It is operational, powering the air suspension on and off. I'm unaware of any other "air compressor button under the passenger side dash".

I'll likely convert the system before I replace the relay a second time. Thanks for the heads up.

 

Anybody have experience with Standard Motor Products parts?

Kinda hard to justify $122+ higher price for the OEM relay. Especially when I have had really good luck with $8 Ebay COPs. If the cheap relay can last until warm weather when I can evaluate systemic air ride condition, I'll be happy.

 

You can save $92 and pick up a used one on eBay for around $29.

 

Your solution for OEM is even better than that .

OEM F3LZ-2C013-B is around $200 online, higher locally. For a relay for cryin' out loud.
The RY319 is $78 new with free shipping (Amazon Prime).

$29 is a very inexpensive risk if a taxed compressor fried the original relay.

 

Yes, that's the switch I'm referring to. It's a switch to deactivate the system as well as a reset button once the suspension light comes on.

Mark is right... System leaks overheat the compressor with continual use. Check your air bags first, the small air connector just over your power steering unit on the drivers side. Both go bad.

I had to replace the rear bags after 10 years. They do wear out and after having to reset the system often, I knew I would do more damage shortly if not.

 

I didn't notice unusual compressor activity before it quit working and the rear end bottomed out. The front looks normal to me. It has been really cold here in New England lately, maybe a leak has been exposed or a tired compressor has had to work harder and it cooked the relay. Anyway, an airbag check is gonna have to wait until it's warmer unless an obvious failure presents.

If the compressor is struggling and the system holds air, can I switch off the system once the suspension has been raised and drive the truck safely?

 

I think it would be a good test to turn off the switch and see if it does hold air, and for how long.

If the bags are still good but your run them low, you can easily do damage to them.

I personally wouldn't drive it unless an emergency. Remember that the system adds and subtracts air as needed and with it off, it might still let air out when driving based on the leveling sensors.

 

Understood. Thank you for your answers.

The truck was driven a few local miles with the rear end down. Fingers crossed there's no harm done.