Changing Heater Core
Thread Starter
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Elder User
Joined: Jan 2007
Posts: 620
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From: Langley, BC, Canada
Changing Heater Core
Im just gettting ready to replace my heater core since its starting to get colder in the morning and im going to need it pretty soon for my drives to work. Before i start i was just wondering how i get to the heater core...do i access it from the engine compartment or is it in the cab by the glove box?
i think i have everything pretty much covered but my other question is how much coolant do i have to buy since im going to have to drain it out? and ive also heard something about adding something to the coolant...can somebody please clear things up for me?
i think i have everything pretty much covered but my other question is how much coolant do i have to buy since im going to have to drain it out? and ive also heard something about adding something to the coolant...can somebody please clear things up for me?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
4 gallons of antifreeze
4 gallons of distilled water
2 pints of DCA 4
Another alternative is heavy duty diesel antifreeze which has the SCA (DCA 4) premixed into the antifreeze.
I am running Fleet Charge premixed in mine.
The antifreeze is purple.
As for changing the heater core,
Drain the coolant and remove the hoses from the heater core in the engine compartment.
Then I take the glove box out and then open the heater up on my 86.
About a 40 minute job.
But I think the 94 may be a bit more involved since the dash is different.
4 gallons of distilled water
2 pints of DCA 4
Another alternative is heavy duty diesel antifreeze which has the SCA (DCA 4) premixed into the antifreeze.
I am running Fleet Charge premixed in mine.
The antifreeze is purple.
As for changing the heater core,
Drain the coolant and remove the hoses from the heater core in the engine compartment.
Then I take the glove box out and then open the heater up on my 86.
About a 40 minute job.
But I think the 94 may be a bit more involved since the dash is different.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
Glove box remove, then find all the screws holding the heater core cover on, there are 7...... make sure you use the foam piece(s) you find. When installing the new heater core ensure the tubes are sealed from the engine side at the firewall.... any leaks at the hose connections has a nasty habit of leaking inside the cab/heater box..... don't ask how I know. Now if your changing the core because of lack of heat in the winter there is a little adjustment available on the blend door cable.......look in and up through the glove box opening. You should see a red barrel with grooves and a white locking devise, this adjusts the amount of rotation of the **** for heat/cold selection.. you may have done this before.
Thread Starter
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Elder User
Joined: Jan 2007
Posts: 620
Likes: 0
From: Langley, BC, Canada
Originally Posted by PLC7.3
Glove box remove, then find all the screws holding the heater core cover on, there are 7...... make sure you use the foam piece(s) you find. When installing the new heater core ensure the tubes are sealed from the engine side at the firewall.... any leaks at the hose connections has a nasty habit of leaking inside the cab/heater box..... don't ask how I know. Now if your changing the core because of lack of heat in the winter there is a little adjustment available on the blend door cable.......look in and up through the glove box opening. You should see a red barrel with grooves and a white locking devise, this adjusts the amount of rotation of the **** for heat/cold selection.. you may have done this before.
ive figured out how to get to it...and ive replaced a few before so i know how to do it...can somebody give me some more info on the coolant thing and the additive...im not really sure i know what i need right now.
Junior User
Joined: Sep 2006
Posts: 64
Likes: 0
Heater Core Change
Found this from another thread awhile back. Can I just drain the fluid from the radiator and then replace with the fluid I drained when I'm done??
Do I need any sealant or anything else in addition to the core??
Mike
Originally Posted by Dave Sponaugle
4 gallons of antifreeze
4 gallons of distilled water
2 pints of DCA 4
Another alternative is heavy duty diesel antifreeze which has the SCA (DCA 4) premixed into the antifreeze.
I am running Fleet Charge premixed in mine.
The antifreeze is purple.
As for changing the heater core,
Drain the coolant and remove the hoses from the heater core in the engine compartment.
Then I take the glove box out and then open the heater up on my 86.
About a 40 minute job.
But I think the 94 may be a bit more involved since the dash is different.
4 gallons of distilled water
2 pints of DCA 4
Another alternative is heavy duty diesel antifreeze which has the SCA (DCA 4) premixed into the antifreeze.
I am running Fleet Charge premixed in mine.
The antifreeze is purple.
As for changing the heater core,
Drain the coolant and remove the hoses from the heater core in the engine compartment.
Then I take the glove box out and then open the heater up on my 86.
About a 40 minute job.
But I think the 94 may be a bit more involved since the dash is different.
Mike
