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Old 05-30-2006, 02:17 PM
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Engine Overheating Why?

Hello everyone,

I just replaced the rear main seal in my 69 camaro (327) and now I have another problem. I drained the antifreeze from the rad and the block to replace the seal. After I finished replacing the seal I started it up an drove the car, it went to 205/210 degrees and didn't go down. I had to keep the car at high RPM's because I didn't want to find out if it was going to go higher. I did turn the heat on upon start up. Prior to the rear main seal being replaced it never went over 190 degrees and was fine. The stat is only 2 years old.

What could be the problem? I thought maybe an air pocket but I filled the rad up with the front of the car about a foot and a half off the ground trying to prevent an air pocket.

As always any and all suggestions are appreciated.

Jim

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Old 05-30-2006, 03:32 PM
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well, your got a big enough radiator. is your antifreeze mix ok? 100% ethane glycol antifreeze ( green ) does not cool off very well, nor does any antifreeze, cars will run hotter with 100%, it should be str8 water or 50/50 mixed. check your oil and coolant for a milkshake shmoo ( will only do this if there is antifreeze in your cooling system, str8 water does not react with oil ) if the shmoo is there, you have a cracked head or blown head gasket, maby a cracked block in a water jacket ( very unlikely but possible ). does it blow white smoke.
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Old 05-30-2006, 04:56 PM
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Jim, if you didn't start the car and wait for the thermostat to open up then top off the radiator with coolant it's probably low on coolant.
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Old 05-31-2006, 01:32 PM
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Anybody else have any suggestions?

Thanks
Jim
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Old 05-31-2006, 01:37 PM
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Did you bleed the air out? Sounds like you have a big air bubble in there.
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Old 05-31-2006, 02:16 PM
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That was my first thought and I tried lifting the front as much as I could when I started the car.

Are there other ways to bleed the system?

Thanks,
Jim
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Old 05-31-2006, 02:26 PM
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Take off your radiator cap and let the car sit idling until the thermostat opens, then let the the coolant cycle throughout, shut it off and fill it back up, this should remove any air from the system.

Dan
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Old 05-31-2006, 08:24 PM
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hot

Is the thermastat opening it could have stuck closed
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Old 05-31-2006, 09:19 PM
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Update

Had the front of the car jacked up about 1.5 feet, topped off the rad and started the car. It seemed to hover around 195 degrees. Took it for a test run 3 minutes later it went to 210. Brought it back home checked the timing it was right on. The stat was new two years ago I just can't see it being bad and hovering around 210. I even put in a bottle of WaterWeter

I could be wrong what do the experts think?

Thanks
Jim
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Old 05-31-2006, 09:28 PM
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Replace your thermostat just to be sure. It's just a $10 assurance for a fail safe one. I've had one fail from getting a little too hot (thanks to the guys inspecting my car and not turning on the fans )and one started opening randomly after only 3 weeks (duralast brand.. go figure). And to be sure you've gotten rid of all your air bubbles in the system, start the motor with about 3/4 of the radiator full, cap off, let the thermostat open and once you see fluid start moving into the radiator from the upper radiator hose, begin adding coolant and be sure to cap that sucker before you shut that motor off, you'll be thinking you were watching a geyser up in Yellowstone if you don't Once everything's cooled down, then top it off and you'll be set.
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Old 06-01-2006, 08:26 PM
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heat

the stat that u have in now what is the degree on it maybe you need to get a 165 and that should keep it down pretty low what kind of heat gauge do u have there is a chance it could be bad
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Old 06-02-2006, 04:05 AM
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if you decide to replace the T-stat, drill two 1/8 holes in the outer flange of the stat to let air escape when filling the system. works every time.
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Old 06-02-2006, 06:54 AM
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If you are replacing your T-stat, drop the old one in a pan of 180 degree water and see if it opens. If it doesn't, you can be fairly certain that was your problem.

In my limited (and hair pulling) experience with malfunctioning cooling systems I've found:

1) 85% of the time it is an air pocket in the system or inadequate fluid
2) 10% of the time it is a stuck t-stat
3) 3% of the time it is a bad radiator cap
4) 1% of the time it is a bad water pump (this will show up in other symptoms)
5) 1% of the time - it's a mystery

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Old 06-02-2006, 09:47 AM
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Quote:
Originally Posted by JimKramer
Hello everyone,

I just replaced the rear main seal in my 69 camaro (327) and now I have another problem. I drained the antifreeze from the rad and the block to replace the seal. After I finished replacing the seal I started it up an drove the car, it went to 205/210 degrees and didn't go down. I

Jim

I am wondering why the seal replacememt mandated coolant removal.

Since the problem started immediately upon first start-up, I would think logically what could cause that situation.

A lower rated thermostat will NOT lower the coolant operating temperature if the car is overheating. (unless the thermostat is stuck)

The odds of the thermostat or gauge going bad instantly at that coincidental time is pretty high.
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Old 06-29-2006, 09:28 AM
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EUREKA, finally after the process of elimination and replacing all of the cooling components it was the last thing that I replaced. The gauge. How frustrating. The good news is that because I replaced everything the temp is great, running around 177 degrees with a 180 stat. At times it will go down to 165 degrees. I am happy.

Side Note: The thing that really made me decide that it was the gauge was as it was going up to 230 degrees on the old/bad gauge the engine didn't feel that warm standing next to it. So, I went to Harbor Freight and bought on sale for $39.00 one of those digital thermometer guns. And it worked great. It was accurate within 1 degree. Plus it has many more uses. Technology is amazing I remember just a couple of years ago they were in the $200.00 range and I thought for $39.00 it would not work well but boy did it.

Thanks again for all of you comments and suggestions I always appreciate it.

Jim
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