It's in the archives, but for some reason it keeps getting cut short in the archives. Here it is in its entirety:Heater Core Replacement Performed by yt nitram on a 1991 NA w/ driver airbag and auto climate control Special thanks to PerlZTT, clarkj, Whoa, and Steve91TT for help during the process When: Is coolant gushing at the feet of the passenger and/or driver? Do you smell a sweet smelling fluid and are your windows fogging up? Your heater core has most likely died a tragic death. Alternative: If you do not need the use of your heater, you can bypass the heater so that coolant flows only within the engine compartment. All you need is a U hose that you will use to replace the two hoses in the engine bay. This bypass is a safe, easy, and cheap alternative if you choose not to use your heater again. Cost/Time: The approximate cost for the actual heater core from Nissan is $80-120. The two hoses are approximately $8 each. Nissan dealerships like to charge $600-800 to do the heater core replacement. This is NOT a short little DIY, it is very involved and requires complete removal of the dash, guage pod, instrument cluster, partial dismantling of the a/c box, and complete removal of the heater box. Here are the basic steps and time it took me (inexperienced with no how-to): 1. Remove dash (4 hours) 2. Get to and remove heater core (3 hours) 3. Transfer core and reassemble heater and a/c (3 hours) 4. Reassemble dash (2 hours) Keep in mind, those are hours of actual work. Often, I would end up working for 30 minutes and then running into a tough spot and I'd have to stop for the day to go inside and e-mail some guys who have done this before. Hopefully this writeup will help your replacement go swiftly. Be sure to organize the nuts/bolts/screws so you have an easier time choosing which ones to use when reassembling. I used masking tape and a black marker to organize screws from each panel or box. In some steps, it may be necessary to unscrew/remove a ventilation piece even though it is not mentioned in the step. Be sure to clean everything that was in contact with coolant, or the smell will linger for a long time. Materials: Socket wrench with 10mm and 12mm bits and a piece that extends the socket about 5 inches out Tamper-resistant Torx bit, size T50 (only if you have airbags) Penetrating oil (such as liquid wrench) Philips screwdriver (preferably of 2 different lengths) Flathead screwdriver (preferably w/ one very short and one very long) Large pliars (for removal of shift knob and other small uses) A system of organizing the nuts/bolts/screws A 3 year old who can remove clips in extremely tight spaces, or at least extremely dexterious fingers 1. Remove Dash See the following document:
Writeup by Steve91TT on heater core replacement
By the way, while your dash is out it's a good chance to mend your dash if it is lifting up near the vents. Use epoxy and some vice grips, see Fig8 below:
Good luck!
- yt nitram
- Ty Martin
Thou shalt not place rear wheel on backwards |
17:37:49 05/18/03
Here is the writeup>> - 
