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Re: 97 GMC Safari - best type thermostat, location, temp?
The owners manual will tell you the temp you should use, but you can also look at the old one when you pull it out as it will have the value stamped on it. As for the brand, most are all okay. I use stant brand since that's what the local parts store carries. To find the thermostat under the hood, follow the top radiator hose to the engine block and a domed housing. It's under the housing.
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for the most part its by the throttle body stop by your local GM-dealership in the parts department and they be able to print you off pictures and diagrams showing you where it is located and what it look like as well wish you the best of luck Michigan Man.
A flush is in order. The "chunky" coolent/antifreeze is a result of rust being picked up, usually from the radiator. At some point, it will damage the water pump so I'd flush the system. All the best!
Top center behind the top pulley. Follow the upper radiator hose to where it connects to the engine. I've always called that piece that the hose connects to, the gooseneck. So you take the hose off, then you take the gooseneck off and there sits the thermostat. Make sure you scrape off the old gasket and replace it with a new one. Also, don't try to run your van without a thermostat, your gas mileage will drop off the charts. We used to do that back in the day before all the computer controlled stuff when I lived in Florida. If I've helpped you, please remember to rate me. Thanks.
It sounds like your thermostat is bad - it has become worn to the point that it will not close anymore, making the coolant circulate all the time- this is why it takes a long time to heat up, because it never builds heat before the thermostat opens.
Humm I make the assumption that you don't have overheating problems. Yes, sounds like a thermostat is stuck open. If you have a gage on the dash you may also notice that the engine temp takes a long time also. Sometimes when you sit a light for a while the temp edges up and starts to get warm....then when moving down the road a higher speeds the temp cools off again. this does this because the thermostat may be stuck open and it cools the heated water in the engine when moving. Also, check the coolant level in the radiator. (only do this when cold!!!!!!!!) ok????? NOT HOT! low coolant can affect how the heater performs. (low volume)