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I have a 2002 year end (2003) Pontiac Montana, its AWD. It has 138,940 on her. I bought her two and a half years ago for $3200. This thing had one previous owner and she used it as a Yoder-Toter. (She hauled the Amish to stores and what not). She was my buddy haul'in late night summer fishing trip vehicle. Okay enter my denial: And this winter in Ohio we had -20+ temps. One day the wifey was taking her to work and she decided to not put out heat. Well I thought it was the thermostat again. (I replaced it when I first got the van.) I replaced the thermostat. Then I got a coolant flush at Valvoline. They burped the engine. Then I noticed I still wasn't getting any heat. Then I noticed when I accelerated the gauge would fluctuate and then drop to normal and then Id get heat. Well I replaced the ETI(?). The little spark-plug-like thermal sensor that goes into the thermostat housing. Then I burped the engine. On a steep hill. At a very insane incline. Then I talked to a few people. They said it might be the water pump wasn't working. I replaced (even though it wasn't broken.) Took it to my cousins shop. She and her husband scanned it for me and determined I had some kind of head/head-gasket/possible manifold/manifold gasket related problem; along with transmission errors. To break it down. I have replaced: Water Pump. Power steering Pump. ETI sensor Thermostat. Blower Fan resistor fuse. All 4 tires. Breaks are new this year as well. Here are the codes she's throwing: C1216 EBCM Command Pressure Release 2 Long C1224 Right Rear Speed Sensor No Signal C1228 Right Rear Speed Sensor Signal Erratic C1234 Left Rear Speed Sensor Circuit Open/Short C1235 Right Rear Speed Sensor Circuit Open/Short C1236 Low System Supply Voltage C1237 High System Supply Voltage P1811 Maximum Adapt & Long Shift One of my rear CV boots is broken. Anti-freeze-Lower Intake leaking Differential needs servicing. Power steering has a rack leak. Rack and Pinion has leaking seals. Valve cover Gaskets need replaced. ABS is On, AWD disabled. Now you guys tell me what would you do? I have a little less then $4k to work with. Should I do the gaskets myself and hunt down the ABS problems? What about the transmission? None of these problems hit us until we had the deep freeze. No garage. I know nothing of transmissions. I am just a novice backyard/shade-tree mechanic. Should I scrap her and get something else? You guys tell me what you would do? Thank you in advance.