My 2003 land rover discovery hse rear air bags deflate during travel dkwn road

Hi welcome main problems are the abs valves causing the 3 dash lights (search 3 amigos online) a really badly sited compressor can cause air suspension models to fail giving the bags a slow leak the V8 is a solid engine but can have radiator expansion tank and cap failures
the other issue is electrics windows and door looms are problematic

Could be standard. If so, there should be a pump motor located in the engine compartment. Gets its info from switches on axles.

To replace disconnect battery neg cable then:
1. Remove glovebox door
2. Remove fusbox by disconnect all multiplugs, then remove all torx screws securing fusebox then set aside
3. remove footwell air distribution tube off of heater box
4. disconnect multiplug off of blower resistor, remove resistor/replace,
5. Refit all components

Only the rear suspension on the Disco 2 was air. The Disco 3 SE & HSE had air front and back.

This is not a difficult job for a specialist shop used to doing the conversion but doing it yourself is NOT recommended unless you have a hoist, special tools (like spring compressors) and experience of what to remove.
Do NOT go to a dealer to be ripped off. A specialist Land Rover shop will do this job for around $1000 and save you a lot of angst

SPRAY REAR AIR BAGS WITH SOAPY WATER AND LOCK FOR BUBBLES. dOES NEW PUMP KICK ON?

my cruise controll and blinkers will not work, and my rear air bags went down when the car was lifted up for and alignment and i can not get them to air back up.

Hi,
Well , Your rig has an air ride suspension. The fix may be simple. A loose air line. Expensive , The compressor, the air bags or control valve.
There is available an after-market non air suspension kit.
Sorry ---- other than the loose air lines it get's spendy. I do not know the prices.

call the person dealer and ask them him her for the code

If your compressor is running all the time, it is almost certain that you have a leak. It could be either in the lines going to the rear air bags, or the air bags themselves. Simplest way to find a leak, is to get a spray bottle with soapy water, make sure the suspension is aired up, and spray the lines starting from the compressor. Work all the way back to the bags, now when you get the bags nice and soapy then bounce the rear of the truck up and down. If their are any leaks the soapy water will bubble up showing you wear the leak it.
That is how i would start.

If its a bigger leak the rear air bags wont stay aired up, if its a small leak, then the air compressor will be running all the time to keep the truck aired up.

Remember, when you are driving, the compressor is constantly working to keep the rear bags at the proper height, even more so on rough roads.