Question about 1990 Chevrolet Beretta

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Heater core replacement

Need to remove upper dash in 1990 chevrolet berreta cant find bolts to do so

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  • Chevrolet Master
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Here is the whole job start to finish

Actually. it's not a very big (or difficult) job on the Beretta. You don't even have to remove the dashboard like most other cars. Also, I did it in a little over three hours and only used a 10mm and 7mm 1/4" socket, 7mm wrench, knife, phillips screwdriver and channel lock pliers. Yes, you should get a manual but there is nothing too terribly difficult that anyone with some good mechanical aptitude, and a service manual, can't fix on any year of car.
Also, I am not a professional auto mechanic but do have an aviation mechanics (A&P) licence in the US. So auto mechanics isn't really my bag but I'm not really going to pay someone to do it for me if I don't have to :D
step 1: remove lower passenger side door moulding. step 2: remove passenger side kick panel. Be careful of the speaker and wires.
step3: remove the passenger side dash bezel that is below the glove box. Be carfeul of the courtesy light
step 4: remove drivers side dash bezels, below the column. Be careful of the courtesy light. You will also see some Yellow wires, keep those in mind for the next step.
step 5: disconnect the negative terminal on the battery. Now back under the dash. Follow the yellow wires and you will see a 3 amp inline fuse back by the firewall. Pull that and follow the yellow wires up to the steering column. Disconnect the plug from the wire that goes up into the column. This disables your airbag so you don't accidentally deploy it. Step 6: Raise and support the car. Remove the hoses to the core. Remove the 90 degree fitting on the drain to the left of the hoses (if you are facing the firewall). Lower the car back to ground. It makes it harder to work with it elevated I found.
Step 7: Remove the air duct plenum. There are only two screws about in the middle to remove. Be sure to remove the the small flexible ducts at the top of the plenum on both sides. Working from the passenger side. Pull the carpet back and you WILL see where the duct goes in to floor and connects to the fresh air intake duct. Work out the duct to the PASSENGER SIDE OF THE CAR. It's kind of a pain but if you take your time you will get it out and hopefully not crack it into pieces.
Step 8: remove the screws around the heater core cover. The ones near the firewall were a bit of a pain to remove and there is in the middle towards the firewall over the openning of the fresh air intake duct. (I left this screw out when i replaced everything :P) Now work out the cover out and to the passenger side of the car. be patient and careful. it's not as much of a pain as the duct was. **There is a drain penetrating the firewall, you will need to pull the cover away from the firewall so you don't break off the drain piece or the cover itself.** Step 9: Now you got your eyes on the prize! Top and bottom of the core is the bracket the holds it in place. Remove those four screws and remove the core Step 10: Install the new core. HOPEFULLY you bought an all aluminum unit instead of the piece of crud aluminum and ABS plastic unit that came installed originally. (HEY G.M.! IF YOU CHEAPSKATES WOULD HAVE USED AN ALL ALUMINUM UNIT, IT WOULD SAVE YOUR CUSTOMERS AND SERVICE TECHS FROM DOING THIS AT ALL.) Work the new core in thru the passenger side, and install the holding brackets. Step 11: Reconnect the hoses and fill the radiator back with mixed antifreeze. There is an air bleed port on top of the thermostat housing. Use a 7 mm wrench to open the bleeder, fill the reservoir until you see fluid coming out of the air bleed port. Close the port and look for leaks at your new heater core. Periodically open the bleed port and refill the reservoir as necessary
Step 12: Reconnect the battery. Start the car and turn your heater on to the max settings. ***The airbag being disconnected will set off the MIL on the dash. Don't freak it will turn off when you get everything back to together.*** Get the car to where the temp stabilizes and check for leaks again. Now turn the climate control to off and let the engine heat up until you hear the cooling fan click on. Turn off the car at this point and look for leaks again. When it reaches the point the fan turns on, that is when it is normally going to be the hottest and highest pressure on the system. THE POINT OF ALL THIS IS TO FIND LEAKS AND SEE IF THE NEW CORE IS GOOD TO HOLD WATER BEFORE YOU PUT EVERYTHING BACK TOGETHER. Step 13: Once you are satisfied everything is good to go. Disconnect the battery again and reverse the removal process until you got your interior back together. Be careful and patient putting the cover and ducting in. By now hopefully you haven't spent a whole lot of time doing the project and your whole day hasn't been killed working on a car. :P ***Dont forget to replace the 90 degree fitting on drain in the engine compartment and airbag wires*** You will be working in pretty contorted positions and I am pretty sore from all the stretching and twisting. If you got time, remove the seats. Would make a more comfortable and roomier working area. It was a cool dry day and was getting alot of static build up from moving around on the carpet. I was slightly worried if i touched the airbag wires inadvertently I would sparked to the wires. Then I would be installing a new airbag next! The odds of that were pretty unlikely but airbags deploy with very minimal voltage. A ohmmeter on the wrong setting can set them off I have been told. Also, if you got a friend who can help you. Have one do it. The two of you can work from both sides instead of you alone getting in and out, up and down from the car or floorboard.
So hopefully this helps those of us who own Berettas and Corsicas. The 4 cylinder Beretta itself is a relatively easy car to work on except for some cramped spaces between engine and passenger side fender. If you want to give someone a car that they can work on and learn from, the Beretta is good car for that. Not a lot of bells and whistles but still has all the same equippment and systems any other car has. Easy to work on and parts are not really that expensive. So good luck and hope everything works out as well as it did for me

Posted on Jul 02, 2009

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Who knows where I can get a guide to replace the Heater Core on my 2006 Ford Freestar?


I have the shop manual & wiring book from Ford for your car. If interested, let me know. $25 plus postage.

this is a big job, time consuming. Is it leaking coolant?

Removal and Installation
NOTE: If a heater core leak is suspected, the heater core must be leak tested before it is removed from the vehicle.
  1. Drain the cooling system. For additional information, refer to Section 303-03.
  1. Position the front seats fully rearward.
  1. Depower the supplemental restraint system. For additional information, refer to Section 501-20B.
  1. Remove the wiper motor and pivot assembly. For additional information, refer to Section 501-16.
  1. Remove the LH and RH windshield side garnish mouldings. For additional information, refer to Section 501-05.
  1. Remove the LH and RH A-pillar lower trim panels. For additional information, refer to Section 501-05.
  1. Disconnect the heater hoses from the heater core.
  1. Lower the glove compartment.
  1. Remove the 3 steering column opening panel lower bolts.
    • To install, tighten to 8 Nm (71 lb-in).
  1. Remove the steering column opening panel cover.
  1. Remove the steering column opening panel upper bolts.
    • To install, tighten to 8 Nm (71 lb-in).
  1. Remove the steering column opening panel reinforcement.
  1. Remove the 4 storage console pin-type retainers.
  1. Remove the storage console.
  1. Remove the rear seat floor duct adapter.
  1. Remove the upper instrument panel finish panel.
  1. Remove the LH lower instrument panel bolt.
    • To install, tighten to 12 Nm (9 lb-ft).
  1. Remove the LH upper instrument panel bolt.
    • To install, tighten to 12 Nm (9 lb-ft).
  1. Remove the 4 upper instrument panel bolts.
  1. Remove the upper instrument panel cowl bolt.
    • To install, tighten to 5 Nm (44 lb-in).
  1. Remove the 4 instrument panel center support brace bolts.
    • To install, tighten to 12 Nm (9 lb-ft).
  1. Remove the LH instrument panel support bracket bolt.
    • To install, tighten to 12 Nm (9 lb-ft).
  1. Loosen the RH instrument panel bolts one half of the bolt length, but do not completely remove the bolts.
    • To install, tighten to 12 Nm (9 lb-ft).
  1. Working through the glove compartment opening, remove the RH instrument panel support bracket bolt.
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  1. Position the LH side of the instrument panel slightly away from the dash panel.
  1. Remove the heater core and evaporator core housing support brace nut.
  1. Remove the heater core and evaporator core housing support brace bolt.
  1. Remove the heater core and evaporator core housing support brace.
  1. Remove the 4 floor duct screws.
  1. Remove the floor duct.
  1. Remove the 7 heater core cover screws.
  1. Detach the wire harness from the heater core cover.
  1. Remove the heater core cover.
  1. Remove the heater core.
  1. To install, reverse the removal procedure.
  1. Fill the engine cooling system. For additional information, refer to Section 303-03.

Oct 31, 2011 | 2006 Ford Freestar

1 Answer

How to uninstall heater core from 2002 camaro


Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
Remove the heater hoses..
Remove the heater core tube clamp bolt.
Remove the heater core tube clamp.
Remove the heater core shroud seal.
Remove the heater rear case bolts (Remove the heater rear case.
Slide the heater rear case downward in order to disengage the upper case clip.
Remove the heater rear case.
Remove the instrument panel (IP) compartment door. Refer to Door Replacement - Instrument Panel (I/P) Compartment .
Remove the heater core clamp bolt
Remove the heater core clamp.
Remove the heater core

Feb 25, 2010 | 2002 Chevrolet Camaro

1 Answer

Would like a diagram of the heater core of a 1999 chevrolet blazer


  • Remove the front dash panel by turning the lower screws in a counter-clockwise direction, then unscrewing the single bolt on the lip of the instrument cluster and pulling the panel out. Remove the rear wiper switch and the 4x4 switches, if applicable. Lowering the tilt wheel will allow the panel to be totally removed.
  • Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
  • Remove the main dashboard by unbolting it at the front, between the windshield and firewall. There are six to eight bolts holding it in, and, once they are removed, the dash can be pulled away from the firewall. Be careful not to pull too much, as the wiring harness could become damaged.
  • Drain the coolant system by turning the drain plug on the lower left corner of the radiator and allowing the fluid to fall into the drain pan. Uncapping the radiator can reduce the internal pressure.
  • Remove the heater core hose, on the upper left of the engine bay by pinching their hose clamps with a pair of pliers and pulling them off. Some models will have screw-type hose clamps; turning them counter-clockwise will loosen them. Age and heat may have stuck the hoses to the core nipples, and the hoses can be cut right at these nipples if necessary. Leave enough hose to reconnect the new core.
  • Unbolt the heater core's mounts with a socket wrench in a counter-clockwise direction. Once the bolts are free, the heater core can be maneuvered toward the windshield and slid out. Some coolant may splash out, so have a towel handy.
  • Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
  • Reconnect the heater core's hoses, turn the radiator's drain plug clockwise to close it, then refill the coolant system with a 50/50 percent mix of coolant and water.
  • Reconnect the dashboard to the firewall, then replace the front dash panel and fasten its instrument cluster screw and bottom bolts.
  • Crank up the Jimmy and add coolant until the heater core is filled and blowing hot air.
  • Replace the radiator cap.
Good luck and make sure you have lots of time and use the camera on your phone and take pictures to use as reference.

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1 Answer

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Jul 02, 2009 | 1990 Chevrolet Beretta

1 Answer

Lower dash removal


The lower dash is pried off. Then there are screws for the heater core cover

Jul 02, 2009 | 1990 Chevrolet Beretta

1 Answer

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Need to locate access panel to replace HeaterCore 1990 Buick Skyl


  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. Raise and safely support the front of the vehicle.
  4. If necessary, remove the rear lateral transaxle strut mount.
  5. Detach the drain tube, then disconnect the heater hoses from the core tubes.
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  8. Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
0900c152800a93fc.jpgFig. 1: Unfasten the sound insulator retaining bolts ... 0900c152800a93fd.jpgFig. 2: ... then remove the sound insulator
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0900c152800a93fe.jpgFig. 3: Remove the heater core access cover
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0900c152800a93ff.jpgFig. 4: Unfasten the heater core retaining bolts; most later models are secured with clamps 0900c152800a9400.jpgFig. 5: Remove the heater core from the vehicleTo install:
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  3. Connect the outlet hoses and ducts.
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