1997 Chrysler Town and Country Problems with 1997Chrysler T

Dear Expert,
I have two real problems with my 1997 Chrysler Van Town & Country and I would REALLY appreciate it if anyone can help:
Problem#1 : The Leak detection pump (LDP) keeps failing – The LDP has been replaced 4 times by a Chrysler dealer in my city – Petaluma in California. Each time a LDP failed about a week after a new one was replaced ( the dealer keep replacing the LDP pump switch because The dealer already run various tests with the emission system - Even they used a "smoker machine" to locate the open hoses but couldn’t find anything wrong!).
Problem#2: I kept driving the car for about six month with a faulty LDP ( of course, with the “Check engine light ON" ) and now there is another problem : the LEDs of the air-conditioner and air circulation switches keep flashing. I used an OBD2 ( innova 3140) to scan for problems : No DTC (Diagnostic trouble code( DTC) was detected but the yellow LED of the scan tool is ON – according to scan tool manual, this means “some of the vehicle’s emission monitors have not run their diagnostic testing. My questions are:
1-Are the two problems related?
2-what to look for problems in the emission system.
3-If the problem#2 involved with A/C climate control, How do I run a self-test to read an error code?
Thank you Very much in advance,
Peter