20 Most Recent 1990 Chevrolet Lumina APV - Page 7 Questions & Answers

mass airflow sensors don't have a vacuum line, you sure you don't mean the EGR valve? if it was the regulator i doubt it would run good or make much of a difference unplugging the vacuum line, take a reading of the fuel pressure, if it starts to drop while the van is running you have a bad regulator.

english please

You can obtain the diagrams from the owners manual, you can download that free from the GM owners site for free. Follow this LINK.

Refer to first replay about this

This year and model has a park lock out device, it is tied into the brake light circuis the 1st thing to do is verify the brake lights work.

It would help to know specifically what van.
But in general, there would also need to be some kind of temp sensors. If what ever van you have just uses the ECM to turn the fans on and off then it may be a bad computer temp sensor.
The ECM also needs to send a ground signal to the relay when it gets the right temp readings. You can also check for power at the relays.
There could also be a temp sender elsewhere like in the radiator or cylinder head that will supply a ground when the heat is up.

You can get free diagrams from AutoZone.com in the repair section. These should show you everything in the circuit and give an idea of what to check.
You will just need to register, which is also free, and enter the specific vehicle.

That would depend on what parts you're trying to interchange.

POSSIBLE CAUSE FAULTY FUEL PUMP OR FAULTY PCM.

THE TRANSAXLE CAN ONLY BE REMOVED AS AN ASSEMBLY WITH ENGINE AND SUBFRAME.

Sound like an air pocket, in the cooling system.

It's not really something u can do in your driveway if u don't know much about cars but this will help ya out take off sepentine belt with 15mm wrech at the tensioner take off passenger side tire u will need to take off the crank pully the big one at the very bottom bolt Is roughly a 7/8 head no the bolt u will need a crank pully puller and the sensor will be on the right an u will need a 10 mm socket to remove it good luck

You have to get a tool at the auto parts store ware you get the R134 A gas . There are 2 ports on the system the tool will olny fit on one of them it will cost 40 dollars or so wicth is half of what it would cost at a garage not to mention a dealer and the tool is reuseable ' Look on the passanger side near the fire wall you will see the the blower motor but also the AC acumilater follow the lines from the compresser the 2 fittings will be on the upper line with plastic caps on them it will olny fit on the one you need . HOWEVER don't try to over charge the system read the derictions and follow the gauge on the tool . AND THIS GAS IS UNDER A LOT OF PRESSURE SO DO NOT OPEN THIS GAS SYSTEM FOR ANY REASON IF THE GAS HITS YOU IN THE EYES IT WILL FREEZE YOUR EYE BALLS AND YOU WILL NEVER SEE AGAIN . So just be smart with it and follow the derictions

The fuse diagrams are on pages 242-245 of the owner's manual.

http://pdfcast.org/pdf/1993-chevrolet-lumina-owners-manual has it in PDF if you do not have the original

Give some more details of the problem.