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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-08-2009, 02:23 PM   #1 (permalink)
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Heater core

Hello all! My heater core is taking a wizz on my passenger side floormat. 1)How big a deal is it to change the core on these, on my bro's ram we had to take apart the dash & "evacuate" the a/c refrigerant. 2)What kind of coolant is the best? Mine is clean and I'll test it before I'd reuse it but these are so prone to cavitation (from what Ive heard) I'd like to put off rebuilding the engine for another couple of years.
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'96 E350 7.3 Powerstroke powered extended cargo van, aka Vanna White, 363k miles, 20.8 avg mpg on my last road trip
'88 F250HD XLT Lariat 7.3 IDI Supercab longbed, mileage unknown (but it's ALOT), aka Brownie, the epitome of reliability
'06 Dodge Charger Daytona R/T, for my doppelganger, 60k miles
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Old 11-08-2009, 02:32 PM   #2 (permalink)
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Also, aluminum core vs copper core? Which is better?
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'96 E350 7.3 Powerstroke powered extended cargo van, aka Vanna White, 363k miles, 20.8 avg mpg on my last road trip
'88 F250HD XLT Lariat 7.3 IDI Supercab longbed, mileage unknown (but it's ALOT), aka Brownie, the epitome of reliability
'06 Dodge Charger Daytona R/T, for my doppelganger, 60k miles
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Old 11-08-2009, 09:24 PM   #3 (permalink)
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Cavitation is held in abayance by using SCAs and good coolant.... tested regularly.

Check and ensure the hoses outside the firewall are not leaking into the truck.

Copper is best.......

Under the dash on the right side there are picture shows 7 screws...... I have just uploaded the heater core exploded view to my photo link.
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Old 11-08-2009, 10:06 PM   #4 (permalink)
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Thanks cdnsarguy, you're like the top dog on here. Parts store only had the aluminum core, but hey, for $23 and a lifetime warranty, its all good. From the pics it looks amazingly easy, I'll pop it in later this week. Also, I tested the coolant with one of those floating ball testers, & its good to about -35*F, but I'm guessing that has NOTHING to do with SCA's?
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'96 E350 7.3 Powerstroke powered extended cargo van, aka Vanna White, 363k miles, 20.8 avg mpg on my last road trip
'88 F250HD XLT Lariat 7.3 IDI Supercab longbed, mileage unknown (but it's ALOT), aka Brownie, the epitome of reliability
'06 Dodge Charger Daytona R/T, for my doppelganger, 60k miles
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Old 01-06-2010, 01:53 PM   #5 (permalink)
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How do you get the stuck heater hoses off ?
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1990 F-250 SuperCab 7.3L IDI Diesel XLT Lariat captains chairs Crown Vic Two tone Gray paint job. Stock truck.\/ Warn XD9000 winch/ chrome brush guard mount. Toys 13' AB RIB with 30 HP 4-Stroke Tohatsu OB.
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Old 01-06-2010, 09:51 PM   #6 (permalink)
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Slice them lengthwise at the nipples and just put new ones on with the new core. Hint: Brush antiseize inside the ends of the new hoses and they'll come off easier if you ever have to do the job again.
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1988 F350, NA 7.3l, 5-speed, crew cab, 4.10 SRW. Miles: over 450K. Being taken off the road within the next month or so to deal with advanced rust. May just do a resto/rebuild to better my bodywork & paint skills.
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