The bottom one traps tons of air and the holes in your thermostat should help you burp all of the air bubbles out of the bottom of your engine. The steeper the slope the better.ģ: Jam funnel into the filler neck and fill it with coolant until it stops bubblingĤ: Top off funnel so you don't suck more air into your coolantĥ: Squeeze every single hose until no more air comes out and you hear no more air bubbles. I let mine sit overnight before starting.Ģ: Park on a steep slope with the front end of the car higher than the back. You can technically do it with these still on, but even I'm not stupid enough to try.ġ: Let engine cool down completely. If your accessory belt or fans end up eating your fingers, don't say I didn't warn you that this is extremely stupid.īefore starting, take off your engine cover and remove your air intake so you have the maximum amount of room to work. Be warned, it involves sticking your hand into your engine bay while the engine is running, and you have to be completely aware of every movement you make. My procedure for burping my car is below. I highly recommend getting some leather or goatskin gloves for this because the radiator hoses get hot enough to raise blisters. People say you should buy those expensive funnels with the built in cap, but I get by just fine with a three dollar funnel and five dollar hand pump. There's no shortcut for burping the coolant and you'll save time in the long run by doing it the right way the first time around. I've gone three weeks of highway driving, spirited driving, and stop start driving in massachusetts traffic with no overheating or overflowing. What made the most difference was taking the time to properly burp the coolant system. On the way back after about four hours total of driving with 20 minutes to cool down in the middle, the car still overheated and I had to add more coolant. Before installing the cap, I added coolant to my radiator while the engine was off, and squeezed the top two hoses until no more air bubbles came out. My engine doesn't run unusually cold, I still have heat, and it takes the same amount of time to warm up, so you shouldn't be too worried about any of these if you don't go overboard with the holes.Īfter drilling my thermostat, I bought an OEM radiator cap straight from a dealership since everyone says aftermarket ones suck. I had an ASIN thermostat in my car that I'm fairly certain wasn't sticking, but for good measure I drilled a 5/32 inch hole on either side of the bleeder thing on the top so air and coolant could pass through even if it was cold. I noticed that coolant was coming out of where the radiator neck connects to the hose for the overflow tank and added a hose clamp there even though I've read that you don't need one. The most effective fix was properly burping the cooling system, but there's a few other things you should get out of the way first to eliminate any way for air to get into your coolant.īefore specifically setting out to fix my overheating issues and overflow tank overflowing, I replaced the PCV valve and pretty much every hose clamp on the radiator and vac lines due to the old clamps being in various states of disrepair. I had this issue ever since I bought my car and finally fixed it. Or rather I'll upload that in a bit because apparently I cant do that from Tapatalk. Could I write those off as hoses that need replacing (and possibly a thermostat gasket)? If you're interested here's a relatively boring video of my coolant. Once the thermostat started cycling open I stopped getting the big bubbles and instead just a steady stream of tiny ones. There were large bloops and bubbles while warming up but I'll hazard those as trapped air. While I was burping the radiator I checked for bubbling similar to the video once it got up to temp. I also took the opportunity to replace the coolant pipe and hoses that go to the oil cooler since they were rusty and crusty and gross and I'd been meaning to do that for a while now. I don't know if the new cap helped with that or not. Also the coolant that had filled the overflow drained back into the radiator overnight. Well I went and got a spill-free funnel yesterday and did a drain-and-fill of my coolant just now (I wasn't sure how much I'd lost so I just drained it, measured it, and dumped it back in plus new coolant to top off.
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