Im usually a lurker and don’t post much. I decided I would attempt to write a partial how-to for installing a heater. Hopefully someone else can benefit from this. Excuse the grammar and the rambling 🙂
1 qty Summit Heater SUM-991102-1 $135.00
2 qty Summit Heater ducting with vents and brackets SUM-991103-1 $30.00
1 qty Moto Alliance Thermostat bypass HT-BP102 65.00
1 qty Universal parts Y fitting Z17550 17.00
9 ft 5/8s heater hose 10.00
5 qty 5/8s hose clamps 5.00
1 qty 3/4s hose clamps 1.00
2 qty sheet metal screws 1.00
2 qty gates unicoil 10.00
1 gallon antifreeze 14.00
3 ft red 14 gauge wire
14 gauge eyelet
inline fuse
1 water pump RTV silcone gasket 4.00
Tools
2 Ratchets 1/4 inch and 3/8s
Multiple extensions
Screwdriver
3/4 inch drill spade
Drill bits
Wire crimpers
Dielectric grease
Drain pan
Sandpaper
3 in 1 oil
Remove dash
Remove the center bracket (see right arrow) that supports the center dash box. That bracket can be trimmed to fit around the heater. I have not completed this part.
Use the supplied L brackets that came with the heater and drilled a pilot hole in the front dash support (I did not use the summit racing sheet metal screws I purchased longer ones) I installed them facing inwards (See red in picture).
The bracket on the drivers side is butted up against the bolts that protrude from what appears to be the steering column brace (see left arrow).
Attachment 164809
Attach the heater to the brackets with heater core inlet and outlet on the right side and the heater at an angle so you are able to utilize both upper and lower bolt holes. Once I had the heater mounted I moved on to plumbing I will follow up with duct routing and switch install.
[Attachment 164817
Thermostat bypass
This was a tricky one :rm_thumbdown:
Remove bed access panel.
Wipe off intake boots and loosen hose clamps.
Attachment 164825
Remove intake mounting bolt. Get a second set of hands, I didnt and it was a little difficult as you have very limited access to it. The intake bolt has a sleeve that was wedged between the bracket I was unable to reinstall the intake until I trimmed the sleeve down (just a tip if you find yourself fighting it)I ended up spraying a liberal amount of WD40 on the sleeve and rubber bushing and gently rocking and lifting the intake.
Attachment 164833
Sleeve
Attachment 164841
Remove thermostat housing You will lose a small amount of antifreeze.
Install small screw and copper washer into thermostat bypass. (Sort of a pain once installed)
Install thermostat bypass with o ring facing engine (only way really)
You don’t need it but you can install a small amount of RTV on the face of the bypass you don’t necessary need it since it has an o ring. Tighten to 7 inch pounds. Do not over tighten.
Attachment 164865
Connect 9 foot of heater hose and route alongside other engine hose and into oil access panel. Route hose outside of drive shaft area.
Attachment 164873
Drill 3/4 inch hole into firewall for hose and sand edges if needed.. Black arrow hose from thermostat.
Attachment 164889
Cut lower radiator hose and install Y facing engine. Before cutting excess hose give yourself extra to allow for wide bends so as not to cause it to collapse. Alternatively you can install gates unicoil.
Attachment 164897
Route hoses through firewall and attach to heater. It does not matter which hose attaches to what nipple on this model heater. The heater might come with flow restrictors, you can leave these on or remove them. I heard multiply reasons. One thought is that they keep the coolant in the heater core longer to provide more heat or they prevent the heater core from blowing out which I doubt that would be the case in our situation.
Attachment 164921
