Jemima Aaron: What brand of Cooling System Pressure Tester set are you using? I would like to buy what you have. And where online can I find it?
mbdulka: I've recently been chasing a "gremlin" -- my car is pushing coolant at high-boost only .... I've done all these tests:
1. Compression Test = OK 2. Leak Down Test = Ok 3. Radiator Cap Test = 1 of 2 was a bit weak, so got new ones (problem still presisted) 4. No oil in coolant; no coolant in oil 5. UV Dye test into coolant = Ok (no dye in exhaust or anywhere else) 6. Radiator system pressure test (holds pressure to cap) 7. Removed thermostat (looked a bit bent) = didn't solve issue 8. Vacuum system test (holds vacuum) = Ok 9. Videoscoped pistons for leaks/coolant = All ok
Flushed the system good (was pretty clean); put in new thermostat -- used vacuum coolant filler (no air in system) ... used a mix with less distilled water. Last check it didn't push coolant. Even on big boost.
What you might get is a head lifting on boost, but not during idle/cruise -- most of these tests will not show you that unfortuately. Good video.
daniel w: Very informative video ur the man
sam davies: Cool workshop attire!
RbG666 84: for me i buy a co2 combustion tester and is the best!! no need mount nothing is very fast
Jafromobile: Thank you Kyle! I always appreciate your awesome comments. It's also nice to see you explore my old skool DV videos, too! :D
Kyle Whybrew: You really do nothing less than perfection. A very detailed and accurate video on coolant systems and head health.
myHome109: Add coolant with engine running, with heaters on full blast to circulate coolant into the aux heater radiator, and the engine fully warm so the thermostat is open. Never add coolant to a cold engine that is off. That's too easy to trap air pockets in the heads and block passages. Always have more fluid in the overflow tank and never allow cooling radiator to suck in air, this cause trapped air pocket and overheating!
Jafromobile: And there you have it...
That's precisely why I boiled over on the dyno. Mine was complicated by a failed overflow system, but once air got in, there you go. Boyle's Law.
myHome109: Here are couple of tips. 1) Air expands and contract more than water, therefore any air pocket will trap steam and push out the water from the overflow. 2) BAD radiator caps can significantly lower the boiling point of the radiator fluid. The 13-14 PSI radiator cap will prevent the 50-50 mix from boiling up to 290 F. At 2-4 psi which are bad caps, the boiling point is reduced to 230-240 F, effectively boiling out the coolant without signal overheat, until completely dry.
Jafromobile: If you are for sure blowing exhaust into the coolant system, it's a safe bet that the head gasket is blown or the head is cracked. Under normal circumstances, that should never happen. It just means that the gasket isn't breached anywhere around the oil return galleries. Aside from overheating, driving it like that can damage the radiator or heater core. Replacing the head gasket is the right fix. A radiator pressure test will expose any other leaks in the coolant system.
Rashan Sankofa: I drive a 2004 chevy impala 3.4 engine. I have no coolant mixing with oil. no smoke coming out of tailpipe but yet my car is running hot fast due to combustion gasses in my coolant system. Should I change my radiator cap? what? Thanks.
Alexander Lawson: Very educational video mate you sir are a grease monkey :) thank you for the video
Jafromobile: That manifold is junk. If you have a DSM flange, you should go with a cast manifold rather than tubular because there are so many great factory and aftermarket cast iron options with that turbo flange available. Tubular manifolds love to crack. Either the EVO 8 or FP race manifolds are a much better options and I have 2 videos that demonstrate why. Look for "4g63 Manifold Swap #1" and "#2" on my channel. If you have a 1g, even the 2g stock manifold is an upgrade.
ipwn1911: how much was your exhaust manifold and where did you buy it ? :)
momo: Hey there jafromobile you gave me a good idea to check my head cylinder on my 22R I been having problems with the timing but I don't want to say the timing is bad...It's more like I'm going to recheck my head cylinder since I did the valve job just want to double check everything is cool then go back to my timing. Thanks Bro!
Mike D.: This is why I prefer white American mechanics, skillzzzz. never go to a Russian or African mechanic .Straight up honest..
Jafromobile: Thank you for your inquiry. Yes, but it wasn't the only problem.
The other issue was my coolant overflow bottle. Aside from the fill and vent tubes, it wasn't air-tight, so it let air back up into the coolant system. I made a "Monster Can Coolant Overflow Bottle", and it's in a video here. It's in several videos, but if you search that, you'll find it. ;)
Engine coolant system and compression testing5
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