Question about 1997 Pontiac Grand Am
Engine overheating can't find problem or just remove the thremostat
Have you considered power flushing the block to remove buildup of oxidation which insulates and holds heat? I assume you have replaced the thermostat with no results. There are opinions about operating with not thermostat. Some say it prevents the engine from reaching operating temperature and therefore is running ineffectually and won't meet emissions.
Posted on Mar 20, 2014
No, definitely not! I do not recommend running the vortec engine without it because it slows down the waterflow giving time to cool as the coolant circulates. I also watched my sister and husband blow one up by doing that. I did a good bit of research after that and found several cases of the same and GM also gives warnings of damage to the engine.Always use a new thermostat and make sure the fan relay is working.
Posted on Mar 21, 2014
I don't want to get into a He said / He said here but the thermostat also serves to control the flow of water through the block. If you want to run without, get some side cutter pliers and remove the centre part that opens. Refit the remaining outer ring and this will act as if the thermostat is fully open. If you run with nothing in there it may prevent the engine reaching correct temperature as mentioned elsewhere or it may induce overheating by allowing the water to pass too quickly through the rad.
You need to establish the cause by other checks. When hot is the rad hot all over side to side and slightly cooler towards the bottom?
Are the large hoses to the rad hot upper and cooler below?
Does the heater blow hot? It may be blocked. Although this is a separate defect.
Has the vehicle been properly serviced from new with coolant/antifreeze at all times? Any time longer than a week without antifreeze or summer coolant in the warmer states will start a process which will clog the heater and main rad. If this cannot be confirmed the only way to ensure cooling is to fit a new rad after a thorough flushing with rad removed. Modern aluminium rads cannot be cleaned to a worthwhile standard. The comment about head gasket also applies, running without coolant will corrode the gasket material. Are there bubbles in the header tank with cap removed on initial startup? Don't do this when hot!!
I know it sounds crazy but I've had a Hilux that had been running without coolant and the steel water pump impellor was completely corroded away, so the water wasn't circulating. That one took a bit of working out!!
If fitting a new rad solves your problem make sure you run with a thermostat and antifreeze because low water temp can bring about all sorts of other problems which get your smog system all worked up.
Posted on Mar 20, 2014
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Posted on Jan 02, 2017
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