H3 Upgraded Battery

Next time the battery in a H3 Hummer dies, I recommend getting the Optima Battery 8042-218 D75/25 Red Top or Yellow Top instead of a factory replacement. Although, the Optima D75/25 is much bigger than the factory battery and will not fit inside that plastic box… but who cares. Personally, I think the plastic box is just there to add a distraction from the small battery and the non-GM labeling of the battery. So I ditched that factory hummer plastic box that the battery was hiding in side of, and dropped in a much bigger battery in it’s place.  Reason being, the factory battery is under powered and provides only a single set of terminals. My Warn M-8,000lb winch is capable of such extreme power demands that it can easily damage a battery. The alternator will never be capable of keeping up with the demands either. Throttling the engine of H3 Hummer up to 2,500 RPMs helps out with those demands, but again will not keep up. However a bigger battery is just a better all around solution, just don’t forget to still throttle up when winching. The Optima D75/25 has ~33% more power over the factory battery that GM decided to install. That ~33% more power goes a long way with smoothing out the issues of winching. The Optima D75/25 battery has the added benefit of having dual terminals ready to go. I use the Traditional style connections posts on top for the H3 Hummer factory wiring harness. As for […]

Leaky Sunroof H3 Hummer

A few months ago I fixed an issue where the sunroof on my H3 Hummer wouldn’t properly drain the water. Which would make for a surprise after a particularly heavy rain fall. The problem was from going off-road with the Hummer and flinging mud and debris every where with the sunroof wide open. By design, all sun roofs leak which is why they have tubes to drain the water. If the mud and debris is forgotten about and never cleaned out, it tends to get jammed in the tubes. Once the H3 Hummer sunroof tubes are clogged, the water has no way drain out except out of the sunroof and sadly into my lap. Fixing the clogged sunroof drains is a simple process. On the passenger side you need to remove the plastic panel on the side of the dash to gain access to the lower portion of the drain tube that has this bent shape. This lower piece is white and has black grommet on the fire wall to drain the water outside the vehicle. The upper portion is just a flexible black hose. I decided to disconnect the two hoses and use 125 PSI air pressure from a air compressor to blow the dirt and grime back out the way it came in. Be sure to point the other end outside the vehicle, because I didn’t the first time. The plastic cover for the pillars on both the driver and passenger sides I found to be extremely easy […]

Burnt Out HVAC Instrument Panel Light Bulbs

About year ago in my dashboard a light bulb for controlling the vents went out on my H3 Hummer, making it difficult to see which setting I had the ventilation on. A few months later, I had two light bulbs that didn’t illuminate on my HVAC (Heating, Ventilation, and Air Conditioning) Control Panel which began to make choosing the setting on the instrument panel difficult at night. I called up GM about getting it fix but all they want to do is completely replace the GM Part No. 15840354 CONTROL, A/C Instrument Panel, or with the part ACDelco 15-73909 GM Original Equipment Heating and Air Conditioning Control Panel with Rear Window Defogger Switch. Expensive and very wasteful I found out how to get my hands on the light bulbs from a guy on eBay. Replacing the light bulbs only took about 15 minutes of my time. Now I’m on the hunt to purchase a large quantity of them so that I can sell them to on my websites shop. Begin with putting your finger in the cigarette light socket and put up to release the dash. I know it sounds weird, but trust me it woks amazingly. After which you’ll need to remove four bolts that hold the HVAC Control to the dash with a 7mm socket (or at least that is what I used). I used a 7mm socket to remove the HVAC Control System from the dash panel. I’ve now disconnect the wires so that the HVAC Cluster […]

130,000 Miles

Just the other day, while driving back from a weekend of packing parachutes at Skydive Alabama, my H3 Hummer crossed over the 130,000 mileage mark on the odometer. I think that my H3 has entered it’s proving ground now. This mileage period from now on shows how well built the vehicle really is. With a goal of 250,000 on the odometer, I want to reflect back on the vehicles performance so far. While I wish I had more power from the engine, the 3.5 L (211 CID) L52 I5 has never let me down in all those miles. The body feels completely solid, despite the rust belt’s handy work. And except for the driver side seat, the interior is great. Mike Ditka‘s sons ass is to blame for that one. Anyway, I’ve been worried for years that the damage to the seat in the first 30,000 miles was going to spread. Even though I have been worries, after 100,000 mileage of loving care the seat hasn’t gotten any worse. Despite all the good news, I’ve had needed to replace a few minor parts. Around 60,000 miles, my H3 Hummer’s Radiator Thermostat needed replacing because it would open up too soon. The H3 would run around 25° cooler than what is recommend for the 3.5L L52 I5 engine. After 3 visits to Burning Man and a few rather deep water crossings, the Evaporative Emissions Canister Vent Valve Solenoid gave out. When replacing the Evaporative Emissions Canister Vent Valve Solenoid didn’t come […]

P0455 & P0442 ECU Fault Log H3 Hummer

About year ago my ECU light came on in my H3 Hummer, noticeably after some fun off-road. I grab my cheap Chinese OBD-II to Blue Tooth scanner from eBay, it doesn’t work with Fords, and open the Android application “Torque” . The scanner had no problem grabbing the code and I was able to see the error report in the computer. Fault log report generated by Torque for Android —————— Vehicle VIN: 5GTDN136X68227871 Vehicle Manufacturer: Unknown Vehicle Calibration ID: 12606370 12601134 1260 Current Fault Log —————— P0455: Evaporative Emission Control System Leak Detected (gross leak, check fuel cap, piping etc) P0442: Evaporative Emission Control System Leak Detected (small leak) Pending Fault Log —————— ECU reports no pending faults Historic Fault Log —————— ECU reports no historic faults Other discovered fault codes (possibly pending, current or manufacturer specific) —————————————————- ECU reports no other fault codes logged End of report. After some research I had decided one of two parts had to be giving the ECU the errors, the 20907779 GM Original Equipment Vapor Canister Vent Hose or the 25827646 Fuel Tank Cap. I checked the Fuel Tank Cap over and it looked in great condition, must be the vent hose. Although I ended up buying both parts, because at this point I’m tired of having the engine light on. The day when the parts got delivered to my door, I didn’t have time to install the Vapor Canister Vent Hose. But I was able to quickly put the new Fuel Tank […]