Hubby

I recently purchased a 2003 Jaguar X-Type with around 149,000 miles on it. It is a second car designed to get me to the golf course while not leaving my wife stranded. I love the car, but don’t want to spend a lot of money on it. I should also point out that I am not a great mechanic. When I got the car, the battery was dead, the heater didn’t work and the air conditioning was marginal. I replaced the battery and had to reset the clock, but was not required to enter the radio code. In an attempt to restore heat, I replaced the thermostat. The thermostat was indeed broken. Replacing this did not restore the heat. I also lost one of the thermostat housing bolts, probably into the coolant hose below the thermostat. I probed inside the hose with a magnet but was not able to find it. In an attempt to beef up the air conditioning I added coolant. While doing this I misread the pressure dial. I thought that the red area on the dial meant low pressure and kept adding more. (As I said, I’m not a great mechanic.) I’ve since been releasing pressure through the low-pressure outlet using the hose that came with the coolant can. The AC compressor clicks on every time and the clutch is working properly. I’ve also tried a programming routine for restoring AC after a battery replacement that I saw on YouTube and have run the trip odometer codes. The only relevant code seems to be dtc d900. I’ve also tried to reboot the car’s computer but that hasn’t seemed to help. I’m about ready to take the car in to a real mechanic. (Probably what I should have done in the first place.) Any other ideas?