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Author
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Topic: Heater core failure question
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nayr
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Member # 8820
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posted
 
 
Anyone ever experienced a heater core failure after 2 weeks from replacement it's a motorcraft heater core
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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Martinna
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Member # 12493
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posted
2 weeks? It was installed wrong. Too much force getting the hoses on? Water hoses need WD40 to slide on smoothly. Put a flow restricter in the inlet hose next time. A plastic cylinder with a 3/8" hole in it.
Posts: 1093 | From: City | Registered: Oct 2012
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nayr
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Member # 8820
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posted
I installed it properly no forcing the hoses I guess just got a bad part I will find out Saturday when I pull it out. We're do they sell flow restrictiers locally I saw them on line?
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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wilit
Mustang Messiah
Member # 3367
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posted
I had a '95 F150 that I put 3 heater cores in because they kept leaking. I ended up putting in a flow restrictor and it didn't blow another core again.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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Martinna
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Member # 12493
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posted
Go to a hardware store and find a solid plastic rod that fits inside the bigger heater core hose. Cut a 2 inch piece of it off and drill a hole no more than 3/8" in it. 5/16" is good. You don't want to use a metal restrictor. Metal can erode your core through electrolysis. Replace the foam in the heater core box if it's worn out. The foam keeps the heater core from rubbing against the hard plastic box and wearing a hole in the core.
Posts: 1093 | From: City | Registered: Oct 2012
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nayr
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Member # 8820
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posted
I'm waiting for the new one to come I found a restrictor at the dealer so I will see how it works out
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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Martinna
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Member # 12493
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posted
What is the dealer part number for the restrictor?
Posts: 1093 | From: City | Registered: Oct 2012
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nayr
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Member # 8820
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posted
XR3Z-18599-AA is the part number
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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KevinK
Tech Mod
Member # 9234
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posted
New restrictions are not cheap. You can find then on many newer Fords. Just look for a fixed crimp in a factory heater hose or such when at the junk yard. They are plastic and don’t go bad. My 2002 F150 has one.
Measured the ID to be 1/4”
[ 2018-02-13, 09:22 AM: Message edited by: KevinK ]
Posts: 202 | From: San Mateo, CA | Registered: Jun 2009
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nayr
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Member # 8820
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posted
Lmr has them for$8 but I didn't have time to wait so I got one at Ford for $23 i didn't think about junk yard tho thanks for the info
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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Martinna
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Member # 12493
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posted
What is the diameter of the hole in a factory heater core restrictor?
Posts: 1093 | From: City | Registered: Oct 2012
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nayr
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Member # 8820
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posted
I didn't check but I think it was 3/8
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89 LS coupe sold
95 gt
Posts: 247 | From: 209 | Registered: Dec 2008
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wilit
Mustang Messiah
Member # 3367
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posted
I just bought a copper end cap, drilled a hole in it and jammed it in the heater hose. Total cost, 87 cents.
[ 2018-02-07, 06:56 PM: Message edited by: wilit ]
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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Martinna
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Member # 12493
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posted
A 3/8" hole looks right.
The copper end cap idea is good. I worry about electrolysis between the copper and aluminum. Always use deionized water.
Posts: 1093 | From: City | Registered: Oct 2012
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ALMOST STOCK
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Member # 10085
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posted
Dimensions of Flow Restrictor are 1/4"ID, 5/8" O.D.
Posts: 94 | From: Cameron Park, Calif | Registered: Jun 2010
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