Question about 1999 Pontiac Sunfire
Make sure when ready, he runs engine with rad cap off, heater (not defrost) on, and revs it a little every once in a while for 30 seconds or so, to help in flow & air bleed, while it's warming up. Allow rad fan to come on & off 2 or 3 times, before putting rad cap back on, to try & make sure all airlocks are out of there. If it overheats shut it down & let it cool, then try again. (see also "itisb4me 's posting) something to definately keep in mind if this doesn't work for some reason. I have to step out this afternoon for a while, then dinner out, so I'll check back as soon as I can. Good Luck.
Posted on Jan 02, 2009
I have a pontiac sunfire 1999 and when i first bought it, it did the same thing. It would overheat on idle, not when you were driving though, just when it was stopped. What it ended up being was there was air somehow in the coolant system. It needed to be put on a pessure suction machine to get the air out, that can happen if someone doesn't bleed the radiator correctly when they flush the radiator. It took the mechanic three days to figure it out, we replaced the thermostat and hoses and was about to change out the radiator when he decided to just try suctioning out the air. It was that simple of a fix. I haven't had any problems since. Hope this helps.
Posted on Jan 02, 2009
Also, check the coolant concentration. If too weak, it could freeze up, and not flow throughout system. If too strong it won't efficiently transfer heat, and will jell at cold temp, again limiting flow.
Posted on Jan 01, 2009
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Posted on Jan 02, 2017
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