C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

heater core!

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Old Jun 8, 2008 | 11:41 PM
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Default heater core!

hi, im a newbe and my heater core started leaking {...........at least I think so........ ). I want to use the "FAST GUY" method, but was wondering if i still have to drain the cooling system?? (off topic) I was thinking of puting some new spark plugs in. any tips/ good brands/ help would be most helpful
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Old Jun 8, 2008 | 11:51 PM
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Originally Posted by 3Ran
hi, im a newbe and my heater core started leaking {...........at least I think so........ ). I want to use the "FAST GUY" method, but was wondering if i still have to drain the cooling system?? (off topic) I was thinking of puting some new spark plugs in. any tips/ good brands/ help would be most helpful
The best tip would be to fill out your profile more so everyone can help you. Other than that, I don't know much about the heater core, and as for sparkplugs, some say get the cheapest - no difference with greater price and others say get the most expensive - that there is a HUGE difference. Personally, I changed my original plugs at 85,000 miles with the stock AC delco ones - the same ones I pulled out. $40 for 8 parts that have lasted me 18 years is acceptable in my book.

When you change the plugs, they are going to be a bltch on the passenger side - that's just how it is. Get some good extensions, universal joints, a spark plug gapper -the wire type (double check with feeler gauge for gapping), ANTI-SIEZE on EVERY plug, use some heater tube placed over the plug for the hard-to-reach ones and hand-thread every one, especially if you have aluminum heads. Taking off the wheel well helps too for the passenger side - I've even heard of someone finding a permanent hole in the wheel well for this exact purpose made by the previous owner!! )Your first time is going to suck, unless you have headers.
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Old Jun 9, 2008 | 02:50 PM
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I changed my heater core using the fast guy method. Wasn't too bad.

Before I started, I disconnected the heater core hoses (some coolant dripped into the engine bay) and attached a suction pump (21 bucks from autozone) with an assortment of different size hoses to finally match the heater input output hoses and pumped as much coolant out. Worked ok bu didn't get everything. I also used a cut up blue tarp on the passenger floor to catch what spilled. Not much trouble and worked well over all. Don't use compressed air to BLOW the coolant out. That didn't work well at all!!!!

Be prepare to contort your back though! I ended up feeling back pain for a few days after that whole excercise.

Good luck!
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Old Jun 9, 2008 | 03:42 PM
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i have a new core in the garage...so not looking forward to doing this. hoses tied togeather in the mean time...ughh..just did the suspension a month or two ago...blah..
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Old Jun 10, 2008 | 05:41 PM
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Originally Posted by combustables
Before I started, I disconnected the heater core hoses (some coolant dripped into the engine bay) and attached a suction pump (21 bucks from autozone) with an assortment of different size hoses to finally match the heater input output hoses and pumped as much coolant out. Worked ok bu didn't get everything. I also used a cut up blue tarp on the passenger floor to catch what spilled. Not much trouble and worked well over all. Don't use compressed air to BLOW the coolant out. That didn't work well at all!!!!
Just remove the two heater hoses and flush the htr core with a garden hose. That way it only has some water in it, not coolant if any spills inside during removal.
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Old Jun 10, 2008 | 06:06 PM
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Originally Posted by 84REDCROSSFIRE
Just remove the two heater hoses and flush the htr core with a garden hose. That way it only has some water in it, not coolant if any spills inside during removal.
that is seriously a good common sense idea that i have never heard of before. it would take less than a minute to do and prevent coolant from dripping on the floor when you pull it out.
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