Question about 1995 GMC Sierra C1500

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Can't get heater/ac box out from firewall inside. can't seem to see what holds it to inside firewall

Can't get inside box out to replace the ac coil and header. 95 gmc sl. Can't find out whats holding the box in.

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If you have the whole dash out there will be 2 or 3 bolts from the inside. Then on the out side there is 2 or 3 studs with nuts holding it. 1 if the nuts is almost behind the distributor. The heater hoses and A/C lines and dryer must also be removed. Good Luck.

Posted on May 09, 2009

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The heater core would be the suspect in this case as the only sources of water in that area are the heater core and AC evaporator. May only be leaking under high heat and presure, the new thermostat may have helped this for a while but if the pressure is too great and there is a hole then the water will find it. Could also be a hose dripping inside the firewall for the heater core.

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The heater core and evaporator are in a box together underneath the center of the dashboard against the firewall. My service manual seems to indicate that they both must come out at the same time to access either. Presuming this is correct, here we go.
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First you have to remove the entire dash assy. Once the dash is out then you remove the heater/evaperator box. To remove the box you must first disconnect the heater hoses and the A/C lines from inside the engine compartment, along with a few bolts/screws that hold the box. There may be more bolts/screws holding the box to the firewall inside the car too.(can't remember, too many makes and models.)

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