2008 WRX with 39000 miles. I'm bringing this thread back for some advice please. Here's the link to my first thread.
I used a block testing kit and had a shop test the coolant for exhaust gases and both were negative. The shop suggested a better radiator for track use so I installed a Koyo racing radiator. After the install, my car was running fine as daily driver. But this weekend at the track (12 turn, 2 mile long), I had the same problem. Saturday was rain and 40F. After 5 runs of 20 min. each, the overflow was just over the full line. Coolant temps on my Access Port never went above 190F. Sunday was rain and mid 60's. After one 30 min. run, the coolant was coming out the overflow reservoir and it was bubbling. Also there seems to be a brown residue in the coolant.
I will be having the head gaskets replaced with oem gaskets and ARP head studs. Should I have the timing belt, tensioners, pulleys and water pump replaced as well? Any other suggestions?
Thanks for the help.