Compressor won't come on and check engine light stays on......
We changed out the battery a few weeks ago and got the wires crossed...Anyway, the car runs fine but no ac now. It blows air just hot air. The copressor won't come on. There was no radio either, but we found the fuse behind it that was blown. We've checked all the fuses in the control panel and tested wires etc..for juice. Is there a fusable link under the hood we can't find? Will that make the check engine light come on? Everything else seems to work fine..
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check the wire from alternator to the battery and make sure its not loose on alternator. happened to me a few years ago, forgot to tighten wire to alternator. car lights on dash came on and car quit while driving. just make sure you are getting at least 14 volts at battery while its running, good-day !
Had the same thing happen 2 years ago when it started 80 miles from home when i took off from a red light it didnt want to go pouring white raw fuel smoke i bet it took 5 miles to get up to a speed where i wasnt getting run over we finally got it home and it was the bearings gone in the turbo.
P0300 is a "random/ multiple cylinder misfire detected" and can happen if you change plug wires and cross two when re-installing them (which I did on my 99 Jimmy just 2 weeks ago), or it could mean one of the coilpack coils is failing, etc..
My towncar is doing the same. It actually started about 6 months ago with the fuel light, which turned out to be no problem, just some air in the line. My air bags did go out last week, so it looks like I have a low rider right now:) I'm in the process of converting from air bags to springs. I had the back airbags replaced but then the dang compressor went out and I don't have the money to replace that. The check air suspension light will stay on right before you have to replace the airbags. Turn your car off then on and if it takes a little while for the light to come back on you have a few weeks to go before it goes out completely. Oh and it is a real easy fix. Its gonna cost about 200 bucks for each airbag, but if you convert it to spring it will cost about 150 in parts.
there may be a software update for the powertrain control module for mis-fire monitor. check with your local dealer. but if thats not the case,these engines are known at least in my experience of having the heads crack between the valves and cause mild mis-fires. try compression testing all the cylinders and performing a leakdown test on them as well.