Question about Chevrolet Blazer

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Changed radiator and thermostat in 1985 chevy blazer it ran at 210 degrees, then I drove up and down a hilly terrain and needle approached red zone inside gage, what's wrong?

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195 degrees is the hottest thermostat you can buy, and the warmest your Blazer should get to.

Did you bleed the air out after installing the thermostat? Trapped air will not allow the coolant to do it's job.

Posted on Jul 30, 2009

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1 Answer

I have a 96 Chevy suburban and I was driving through the mountains and the transmission kept down shifting or slipping gears help?


Was it loaded with weight? Could have been overdrive. Vehicle should sometimes be dropped onto 3rd and left there under hilly conditions. So as not to shift too much. Suggest checking trans fluid level , possible trans filter change, or add trans cooler to keep temp down in fluid when in hilly terrain. Good luck.

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Okay here's the deal. The truck has a new thermostat, the radiator passed the hanker-chef test for pulling air through the radiator. The hoses and belts are good. However the 1989 chevy ck 1500 with a...


You need a good diagnostic tool for testing the radiator for cold spots it could be plugged, use your hands warm the vehicle up then shut it off key out of the ignition go to the radiator and feel for cold spots or temperature variations more than likey your plugged

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1999 Chevy Blazer, 4.3L - With temp guage reading 210 degrees, I get about 102 degrees from the center dash vent. New thermostat, radiator cap and radiator (had small leak in radiator). If it is an air...


Hi, 102 seems pretty hot to me. Is the truck not heating up? If you think there is a bubble, here is procedure I recommend:
Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. If no bubbles, close the cap. Hopefully this will solve the problem.

If this doesn't solve the problem, you may have a clogged heater core.

Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are generic instructions. If you get stuck or need specific instructions for your car

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1997 Grand Cherokee Laredo, 4WD, 5.2 V8. My Jeep overheated today. When I went to open the hood I could feel steam. So I waited for it to cool before taking the radiator cap off and see no fluid in it....


Have system pressure tested when cold and full to top. Pressure test will force coolant out and you will be able to trace the leaks location. Hopefully it's a small hose leak and not a major problem like a blown head gasket or cracked head.

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Antifreeze ts boiling back into reservoir. Possibly not circulating properly. Thermostat problem? Temperature fluctuates with changing load on engine. Approaches the overheating "red zone" with an extended...


it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it

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High temp


it sounds like an air pocket... try squeezing the rad hoses a few times and keeping an eye on the level in the rad... this is probably best done with the rad cap off... of course make sure it is cold before you remove the radiator cap.

Robert

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