Compression test results Questions

I hope all of that baking soda came out. A few years ago, I read that you should put "comet" powder in with your flush, and that it would clean out the block real well. Well, I still find traces of comet in there when I work on it. It would find the low points of the cooling system and settle out into a fairly hard sludge. Maybe baking soda will stay in solution better.
 
CameronB said:
I hope all of that baking soda came out. A few years ago, I read that you should put "comet" powder in with your flush, and that it would clean out the block real well. Well, I still find traces of comet in there when I work on it. It would find the low points of the cooling system and settle out into a fairly hard sludge. Maybe baking soda will stay in solution better.

I was worried about exactly that myself. I put a fair amount of effort into dissolving the baking soda in solution. I mixed the 2 gallons of distilled water in a bucket with the baking soda the night before I put it in and mixed and mixed and mixed. Next day I drained the vinegar and setup a siphon to get the baking soda solution into the radiator. When the siphon was done there was a 1/2" of water left in the bottom of the bucket and a baking soda film on the bottom. Figure that was just was not going to dissolve into the solution no matter what.

Also the day I drained the baking soda mix I did start the motor and let it run about 20-30 seconds or so. I don't know if that did any good at all but might have helped kick up any that my have settled in the low spots and wasn't enough to pressurize the system.
 
andyjsimmons said:
My 94 is having the same problems, except mine does fine unless I'm driving in the city traffic or going under about 30 mph. Replaced the fan clutch, the t-stat, t-stat housing, water pump, radiator is a 3-core about a year old, upper and lower hoses. She runs fine if I drive with the heat on, but that sucks. I don't know the temp, since I only have a dummy light. I may try the vinegar/water baking soda/water technique and see how that goes.

If you've replaced all that and it still overheats in city traffic I'd check your electric fan. Since you don't have a temp gauge see if you can find yourself/borrow an IR gun and see if the fan kicks on at 220°F when it's supposed to. If not check/replace the relay and maybe the temp sensors too.
 
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