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according to a local dealer that model has no modulator valve on its automatic transmission sorry !
modulator is round and located on the drivers side of the transmission. modulator unscrews from the transmission if it is a 700 R4 It unbolts with 2 7/16 bolts if it is a turbo 350 Unplug the vaccum line remove the modulator replace with new modulator hook up new vaccuum line
1.6.5.4.3.2
You can add power steering fluid to your 1988 Chevy Astro by removing the top to the power steering fluid reservoir. Pour the fluid directly into the reservoir.
under the hood
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Remove the positive cable from your 1988 Chevy Astro battery. Remove the cables from the front of your starter. Remove the starter retaining bolts. Reverse the process to install the new starter.
I have a 2003 astro with the same problem, it was the blower motor
More Info, If You Do Not Find A Modulator, You Could Have a Different Trans. If You Have A Square Pan With 16 Bolts Then You Have A 4L60 or TH700( no modulator on these) If the pan is oval and 17 Bolts Has 4L80 ( no modulator on these) Hope This Helps You Should Have A TH400 Trans & It Does Have A Modulator.
The PCV valve on a 1987 - 1990 Chevy Celebrity is in the top center of the valve cover nearest the firewall.
weighs in at about 4125, i just junked mine,