How to fix my 2005 PT Cruiser?
In my driveaway business and personal use, I have been building and working on my own PT Cruisers (on #5 currently) as tow cars for 2 decades and never stumped the pros until this one...
First, let's establish the patient: 2005 bottom baseline with 5 speed manual... 2.4L... non turbo.
Problem: This sweetheart wants to build pressure in the cooling system to consistently gain pressure over 18-20 lbs past 1500 rpm and will force antifreeze to the overflow bottle and continues forcing until the engine level is low enough to genuinely overheat ( No, I am EXTREMELY observant and this engine has never been overheated ).
Slow the rpm down to 900 idle and the pressure returns to under 16# (normal) and the overflow bottle doesn't change... no more fluid
Current mileage: 161,000 / Timing belt and water pump 130,000 / New Radiator less than 500 mile as an experiment with new hoses, worm gear clamps, etc.
Here's the kicker - please do not say heads, gaskets etc., as I have (and others in repair have independently ) fully tested for CO2 aspiration at the radiator and the Blessed Test Fluid STAYS BLUE! All cylinders pressure test to within 10% of original specs. No engine water leaks. No oil consumption. period. I change oil (Mobil1 10-40 HM) every 5,000 miles, needed or not - and virtually each of my cruisers have gone over 300,000 on the engine - cruiser #3 went over a documented 750,000 total rolling miles with over 400,000 on the original motor - IRS has my proof.
The golden question: At what other point can you induce pressurized air into the cooling system without showing any sign of leak when it cools off after shut-down?
Changed caps 3-4 times... also 4 thermostats (@195) using NAPA and dealer parts.
Water bottle is a crap shoot as to whether it will be vacuumed back or not.
Properly burp the air out of the system.