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Old 12-10-2010, 09:09 PM   #1
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Default heater core clogged

After I got doors all fixed now I guess my heater core is stopped up. There is 15 degrees difference in the hoses on firewall. Somewhere on this forum I read that this meant core was clogged. One mechanic told me to cut hoses at firewall and force water out with air and pour radiator flush in hoses and let soak and then flush both ways several times. Anyone had this problem and if so does this sound like it will work?
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Old 12-11-2010, 12:47 AM   #2
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pull the hoses loose from the heater core and take a water hose with a spray nossle and spray water into one pipe of the heater core until water starts coming out the other one and then repeat for the other one. It may take a couple if minutes per side. If nothing happens take some purple power or grease lighting type if spray and spray into each spout of the heater core and let stand a couple of minutes and then do the previous steps.
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Old 12-11-2010, 10:14 AM   #3
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I've had success on other cars doing the following:
Get a small submersible pump like a Little Giant or equivalent. Get a 5 gallon bucket. Make some hoses long enough to go from the firewall heater core inlet and outlet to wherever you can put the bucket. Hook one to the inlet and one to the outlet and drop into the bucket.
Now get the hottest water you can and put in the bucket, along with 2 - 3 bottles of PRESTONE RADIATOR FLUSH. Hook up one hose (doesn't really matter if inlet or outlet) to the pump and drop into your solution, plug in and let it circulate for 24 hours.
When I've done this in the past, often times one will get next to no flow coming thru the system, you'll have a lot of backpressure on the pump side, so make sure you have some way to allow the backpressure to bypass the pump, by either using a pump that allows bypass or simply having the hose on the pump put on loosely to where some pressure can escape. You can also alternate between having the inlet or outlet hooked to your pump to maximize the cleaning ability of the flush.
If you achieve the same results I did, you'll be amazed at the amount of 'gunk' that comes out. Once you are satisfied with the results and have decent flow thru the system, run a couple of buckets of clear water thru to get out all the radiator flush chemical.

Good luck!
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