20 Most Recent 1989 Chevrolet G30 Questions & Answers

Question edited for clarity. Question moved to sb category. There is a bypass video, or you could just change the heater matrix yourself. Videos on that too. https://www.google.com/search?q=1989+chevrolet+g30+bypass+heater+matrix ..

Sounds like the cable is disconnected from the water valve. Check under hood at the fire wall where heater hoses connect to heater core. Water control valve should be in one of the two hoses and the cable end should be visible . Water is off when A/C is on.

if your referring to increased oil pressure-check for a clogged or defective pcv valve--- if good and vehicle is not running well possible damage to one or more piston /piston rings or head gasket need to do a compression test-

Did you check for voltage at the solenoid with the key held in crank position? That is the only time the small wire to the solenoid should have power. It sounds like power is not getting there from the ignition switch. It could be a bad park/neutral safety switch on the transmission. Hold the key in start and check for power at the switch connector. One wire should be hot. If it is check for continuity (with the ohmmeter) of the switch when in park. The switch should have continuity in park or neutral, and no continuity in any other gear position.Good luck.

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if it stays running with foot on pedal thencheck vacuum lines. most likely pcv valve hose. if its throttlebody it shld be the lower large hose in bottom middle of throttlebody base. if not that, could be fuel pump, or possibly distributor, control module. (need more detail if not vacuum line problem)

o2 sensor.

Check the antifreeze for temperature protection.Have you changed it lately? Without proper mix in the winter,it will only blow cold air.
Hope this helps

It sounds like a stopped up exhaust system. Converter is plugged up.

the trans is building pressure in it (obviously). Check to make sure the vent is not plugged, it's on top of the trans, should have a small rubber hose coming off of it and laying off to the side(some guys through that away when they are removing it, that's why it said should). If it's not plugged or blocked I would suspect the front pump seal is going bad and pushing pump pressure into the case and it is fallowing the path of least resistance and coming out of the dip stick.

if it was sitting for a couple of years with fuel in it gas as it evaporates leaves a lacquer type film over everything from gas cap ,tank ,filter,lines,pump carb/throttle body alone most likely needs rebuildall these has to be cleaned or solvent run thru

First of all.. Check to see if ya have 12 volts going to the back of the alt. If so.. call your parts house and see if it has an external voltage regulator. If so, try a regulator..That was a tricky year when they had either internal and external voltage regulators. otherwise.. get a new alternator. sometimes, the volt gauge will cause a non-charge issue. You can straight wire the gauge to eliminate that.