Question about 1999 Chevrolet S-10 Pickup

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IM TRYING TO CHANGE MY HEATER CORE ON AN 01 S10. I HAVE THE DASH OUT BUT CAN'T FIGURE OUT HOW TO GET THE CASE OFF OF IT.

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  • blillyblob Feb 13, 2009

    cant figure out how to get blower cover off

  • Joe1974 May 11, 2010

    Do you still need help with this? I see that this is kind of an old posting.

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On the out side of cab under hood in engine compartment on the firewall there are 2 nuts that need to be removed and 1 by the heater fan motor. theres a little secret trap compartment in engine compartment by the ac unit and the heater core fan that has 3rd bolt. the box on the inside of cab will come lose.

Posted on Mar 12, 2009

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Heater core replacement 98 chevy S10 2.2L engine


Tyrone, Check the attached links,instruction and guides, the last link has some very good info. and pics. on S10 heater core replacement. Good luck.
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Can I change heater core in 1989 s10 2.5 no air without taking dash out


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Trying to replace heater core 1994 s10 4 cyl


GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide



Heater Core - REMOVAL & INSTALLATION
1994-97 Vehicles
(see Figure 1)

44d2ba8.jpg

Fig. 1: Exploded view of a common heater core and case assembly
  1. Disconnect the negative battery cable and properly drain the engine cooling system to a level below the heater core.
  2. Disconnect the heater hoses from the core tubes near the cowl.
The instrument panel carrier is designed not only to provide access to parts through removal of the carrier components, but the carrier will also tilt downward as a complete assembly to allow access from the top. If this is desired, remove the retainer screws along the top and bottom of the carrier assembly (refer to the figure). The instrument panel will then tilt as an assembly into the cab. It is necessary to unbolt and lower the steering column from the carrier to allow for maximum movement of the instrument panel.
  1. The instrument panel must be removed or repositioned for access to the heater core case. Unbolt and either tilt the instrument panel forward or disengage the instrument panel components and remove the panel from the vehicle. In most cases, tilting the panel forward should be sufficient for the necessary access.
  2. Unfasten the heater core rear case retaining screws, then remove the rear case for access to the heater core.
  3. Loosen the retainers and remove the heater core retaining straps.
  4. Remove the heater core and seals.
To install:
  1. Install the heater core and seals, taking care not to damage the core tubes when inserting them through the cowl.
  2. Install and secure the core retaining straps.
  3. Install the rear case and secure using the screws.
  4. Reposition and secure the instrument panel and components. Tighten the cowl screws to 17 inch lbs. (1.9 Nm) and the lower instrument panel screws to 66 inch lbs. (7.5 Nm).
  5. Connect the heater hoses to the core tubes.
  6. Connect the negative battery cable, then properly refill the engine cooling system.
  7. Run the engine at normal operating temperature, then check for leaks.

Good luck (remember rated this post).

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2 Answers

Im trying to figure out if my heater core is under the hood or inside the truck under the dash in my 1998 s 10


this under the dash you have to dismantle the board and this is a case where the heter and evaporator air conditioning, good luck fan.thanks

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2 Answers

Heater cord ford expedition 01 5.7liter where is it located and how hard is it to change?


Dear Heater Core Hunter,
For your 01 expedition, that has the 5.4 liter motor in it, the heater core is located in the evaporator case assembly, where the blowermotor itself is located,This is a pretty darn good labor intensive job, if you open the passenger front door and get down onyour knees and look up underneath the dash.....that's what you're going to be removing and replacing, the heater core is inside of this black case.Please get back to me if you have any more questions...I'M HERE TO HELP!!!

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1 Answer

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How to remove heater core in 2002 chevy s10 pu. got dash out and lines off are there hidden screws?


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If you are certain there is no air in the coolant system, then there is a chance that the blend door motor is not working or the heater control assembly is bad. since you have replaced your own heater core you probably noticed the the doors inside the heater core housing. One of those doors is controlled by the "hot/cold" knob. The motor on that door could bad.

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