Question about 1990 Chevrolet S 10 4WD

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Need to replace heater core, not sure where its located.

Do you need to remove the dash to replace the heater core on the 1990 Chevy S-10 pickup?

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No you can split the heater box under the hood but be careful they will break very easily

Posted on Apr 13, 2009

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No, you do not remove the dash. You go under the passenger side and remove a whole bunch of screws with 7mm hex heads from a cover over the heater box to gain access to it. A couple of them are buried way up under there and are very hard to get unless someone has done it before. Nobody puts back acouple of them just because tey're rediculous to get at... but possible. It's a bit of a struggle the first time you do it.

Posted on Apr 13, 2009

  • Dave  C
    Dave C Apr 13, 2009

    Never seen it done under the hood. My experience is with the little blazers which I'm pretty sure is the same as the s10?

  • Dave  C
    Dave C Apr 13, 2009

    Come to think of it, this is the way (under the dash) you do it on a 1991 S10 as well, I did one not long ago.

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Do I have to take the dash out to replace the heater core on a chevy s10 pickup?


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Leaking Heater hose or Core


REMOVAL & INSTALLATION
Disconnect the negative battery cable.
Position a drain pan under the radiator, open the drain **** and drain the cooling system to a level below the heater core.
NOTE: Plug the heater core tubes to avoid spilling coolant in the passenger compartment during removal.


Disconnect the heater-to-engine coolant hoses from the core tubes on the fire wall, in the engine compartment.
NOTE: On some early model vehicles, the cabin light mounted under the dash may interfere with cover removal. If necessary, loosen the retaining bolt and reposition the light housing with the wiring attached.


From the passenger compartment (under the dash) remove the heater core rear case cover-to-cowl screws, then remove the cover from the vehicle.
NOTE: On a few of the early model vehicles covered by this manual, some of the heater core cover screws may be partially/fully covered by the dashboard. Be sure that all are removed before attempting to remove the cover. If necessary, unbolt and reposition all/part of the dashboard for better access.


Remove the straps or brackets from each end of the heater core.
Carefully remove the heater core from the cowl and case.
Installation is the reveres of removal. Run the engine at normal operating temperatures and check for leaks

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you will have to remove the dash assembly and then the heater/a/c box it is in the hvac module.

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Remove the heater hose clamps and the hoses from the engine side of the firewall. From the inside under the dash on the pass. side, remove the lower panel screws and slowly pry the lower cover down and the heater core will slide out of the heater box. Installation is reverse of removal.

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