Since I bought the car over a year ago, I noticed it there was a very very slight coolant leak, as the level was dipping (over the course of months not weeks), but just topped up with a little water and didn't worry any more.
I got an LPG installation done about 2 months ago, and since then, the leak has accelerated quite a bit and i've had to top up with pre mixed red coolant.
Obviously, this needed further investigation. My suspicion was that it was the waterpump (original pump, at 97k miles, not done with TB at 70k)
I brought it to Toyota, and got a pressure test done, and it held pressure fine. He also said it's not the head gaskets so not to worry about that. He said there was a very tiny leak at the waterpump, but in his experience that was normal enough, and felt they all do that. He filled the coolant to the high line, and told me to come back in a weeks time to reassess.
So today, three days later, the coolant level has dropped by and inch & 1/2 on the reservoir.
I'm trying to figure this one out.
It seems that having the LPG installation (which has been perfect, running great and getting almost same MPG as petrol), has accelerated the leak quite a bit. I don't exactly know how the LPG system runs, but could it be taking coolant?
Any thoughts on this one folks? It's a bit perplexing, and with LPG running hotter than petrol, the cooling system needs to be tip top.