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Old 02-25-2008, 10:59 PM   #1
dylanzachgabby
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Default heating and coolant problems 96 sl1

my 96 saturn sl1 the heat blows out cold when i drove the other day under 45 mph then i took it on the highway 50 to 65 mph and i had heat....when i exited the highway the temp gauge when past halfway and again no heat... do i have a bad thermostat....my coolant was a little dark... i had the block check for cracks and cleaned... how can i check to see if its a cracked head...i didnt have a chance to change out the radiator so could the gunk from the radiator be making the antifreeze gunked up.... is there a way to clean out the radiator without replacing it... i flushed it out a couple of times but i do not think i am getting all of it... i even took off all the hoses and clean them... thanks for any help....

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Old 02-26-2008, 10:03 AM   #2
BarnOwl
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Default Re: heating and coolant problems 96 sl1

If you have a cracked head, the coolant will look like chocolate milkshake. However, I don't think you have that problem. Have you ever used a stop leak product in the cooling system. That can clog the heater core. A thermostat stuck open is a possibility. The best way to flush the cooling system is as follows:
  1. Remove the thermostat.
  2. Take the return hose loose on top of the reservior and route to a bucket.
  3. Get a bucket of hot water mixed with automatic dishwashing liquid.
  4. Start the car and as the coolant flows out of the return hose pour the water and detergent into the reservior.
  5. Keep doing this until it runs clear.
  6. Follow with a couple gallons of distilled water.
  7. Drain cooling system and put in new thermostat.
  8. Fill with anti-freeze and distilled water.

I need to get that made into a How-To. BTW this procedure probably won't clear a clogged heater core.

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