Having problems with your 1999 Chevrolet Venture ?

INTake replaced but still having issues

\015 99 chev venture van- we have a coolent issue, we had a bad intake gasket which we have fixed, new water pump and thermostat. For the last 2 days the temp needle was not moving alot and if it did it was air pockets. TONIGHT drove it home(hwy) and the temp gage was all over the place. When it starts getting higher the heat from the blower turns cold and then all of the suddent a hick-up and the gage goes down and there is a burst of heat again,...the coolent level is fine and is not leaking. What more could this be???? Our temp gauge would show hot when sitting still when we drove it, it kept going all over the place. We replaced water pump intake gasket thermostat and we finally broke it down and the heads were cracked so we replaced them. Now when it sits and idles doesnt make a cound runs smooth. Soon as you drive it. It misses ALOT the more you run it, it seems like it runs a little smoother. But it still misses real bad. What can I do?\015 Posted / edited by AnonymousUser on : 23-03-2020

Answers :

I'm betting that you already know the answer and are hoping that there is a quick easy cure you missed...
If you already ran this with the heater on high and system open, chances are there was no more air in the system. You do show symptoms of air (heater hot/cold) but, likely the system is getting exhaust in it Either the replacement heads are warped or had a crack in them that was missed.
Do a pressure test and then check the plugs for signs of water (coolant) on them. If you still think there may be air in the system, jack the corner nearest the fill neck up to get it higher than the rest of the system, and run it again with heat on full.that should get any air to migrate out (seeks highest point) If you have a shop you use, have them check cooling system for hydrocarbons that will verify if exhaust is getting in there.
This is an answer where I actually hope I'm wrong...I know how much "fun" it is to tear it all down again, and do not wish that on you. Check carefully and don't assume anything based on the previous problem. Treat this as a new problem and be sure everything is correct as you go.
It has an air pocket in there somewhere. You may need to get someone who can put a vacuum pump on the system to get the air out. Did you fill it up and use the bleeder screw? Not recommended, but you can run the vehicle and intermittantly crack the bleeder screw open and get more air out that way.
Repair Help & Product Troubleshooting for 1999 Chevrolet Venture

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