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1977 F150 Heater Core Replacement with AC

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  #16  
Old 12-31-2013, 04:29 PM
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Bookmarked, just in case ..... great reminder if it's been 27 plus years ....
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  #17  
Old 01-07-2014, 09:31 AM
Carter78F150 Carter78F150 is offline
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Thank you for great information! Will be doing this coming up shortly.
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  #18  
Old 01-07-2014, 09:42 AM
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Subscribed for later info...great thread.
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77 351M auto, a/c, add a leaf 33x12.50's
78 (79 headlights) 460 4 spd, 4", a/c and 35's
79 351M 4spd 6" Skyjacker Edelbrock-Holley-Hedman 35's
99 Ranger 4x4, 98 Expedition 4x4, 73 Bronco Hillbilly-Bug
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  #19  
Old 01-07-2014, 01:14 PM
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Forget the aluminum garbage heater core, hacking the OE gasket up and buying additional weather-stripping and use the correct brass core.

Ignore the "without air conditioning" they advertise, it is the correct core for A/C.
1973-79 BRONCO HEATER CORE - WITHOUT A/C - BRASS | Laurel Mountain Mustang
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  #20  
Old 08-31-2015, 08:27 PM
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I realize this is an old thread, but it was really helpful for me. I just changed out the heater core on my 1978 F100 Ranger. My project turned out to be a challenge until I finally figured out that I needed to free up the AC hoses (that connect to the condenser [or evaporator as the guy on North Country calls it]). Once I did that, I could move the condenser around enough to get at the heater core. Removing the air filter housing under the hood also allowed the condenser hoses to move more freely.
I opted to do this replacement because I had a leak coming out of the cover and most of the posts on this site indicate a problem with the heater core given those symptoms. We'll see.
I'm basically finished except I've got to put the thermocouple back in then the vent and then the cover.
After that, I've got to get coolant into the new heater core, but that part I haven't figured out. Does that simply go into the engine's radiator, or do I have to fill it elsewhere. Thanks in advance.
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  #21  
Old 09-01-2015, 08:59 AM
HeavyDinSC HeavyDinSC is offline
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Wisdum, thanks for this information, photos and all. Just wanted to know how you refilled the coolant afterward. Can you explain that?
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  #22  
Old 09-01-2015, 02:00 PM
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What happens if you remove that cover under the hood? Is the unit really ruined if removed? What's under it?

I'm looking at this piece and wondering if I can hack some of it out to clear the EFI intake manifold on my 4.9L 6cyl.
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  #23  
Old 09-01-2015, 03:56 PM
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He said air filter housing, as in carb air filter. Are you asking about the evap (big box) cover under the hood or that metal cover that is rived to the side of it?

What is under it.....the blower fan. and heater core for starters. I will post some detailed pics later on this afternoon.
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77&79 F250 Rich & Penny
77 351M auto, a/c, add a leaf 33x12.50's
78 (79 headlights) 460 4 spd, 4", a/c and 35's
79 351M 4spd 6" Skyjacker Edelbrock-Holley-Hedman 35's
99 Ranger 4x4, 98 Expedition 4x4, 73 Bronco Hillbilly-Bug
71 Bronco 302 38.5 Super Sawmpers 5.58 gears spool/locker
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  #24  
Old 09-01-2015, 04:01 PM
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Found them. If you are not using the a/c set, just remove the big box all together and go to a heater core only set up.

Wala, tons of room.
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77&79 F250 Rich & Penny
77 351M auto, a/c, add a leaf 33x12.50's
78 (79 headlights) 460 4 spd, 4", a/c and 35's
79 351M 4spd 6" Skyjacker Edelbrock-Holley-Hedman 35's
99 Ranger 4x4, 98 Expedition 4x4, 73 Bronco Hillbilly-Bug
71 Bronco 302 38.5 Super Sawmpers 5.58 gears spool/locker
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  #25  
Old 09-01-2015, 04:48 PM
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77&79F250, good photos. I'm South Carolina, so I'm going to keep the AC intact. What I'm trying to figure out is once you pull and replace the heater core, and put everything back together, then how do you get the fluid back in the system?
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  #26  
Old 09-01-2015, 06:52 PM
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Take it to an a/c shop and have them service it. Might have them do a conversion from R12 to R134a (fittings) while it is there??? Or something like that, maybe Freeze 12, I think it is an cheap alternate to R12?


That is why there are a/c shops. lol
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77&79 F250 Rich & Penny
77 351M auto, a/c, add a leaf 33x12.50's
78 (79 headlights) 460 4 spd, 4", a/c and 35's
79 351M 4spd 6" Skyjacker Edelbrock-Holley-Hedman 35's
99 Ranger 4x4, 98 Expedition 4x4, 73 Bronco Hillbilly-Bug
71 Bronco 302 38.5 Super Sawmpers 5.58 gears spool/locker
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  #27  
Old 09-08-2015, 11:21 AM
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I think he's asking about the engine coolant, not the refrigerant for the A/C system. That, you just fill at the radiator. Idle the engine with the heater on to bleed the air out.
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