When is The Best Time to "Burp" The Car?

Chambers · 01-03-2008, 08:17 PM

Hi all, I changed the rat fluid a few months ago and I got some air in the system giving me cold heat while driving. I have tried to bleed out the system a few times but I still have some air some where in the it.
My question is when is the best time to "burp" the car, when the engine is cold or warm? By the way, I know a warm rat will spray fluid when opened.
Also how much of an incline would be ideal? Thanks!

btwilson86 · 01-03-2008, 08:45 PM

From what I've read and done on other cars is to jack it up to about 35-45 degree angle (if possible; hills help with this). Pop the radiator cap off, turn the car on and the heater on full blast, and let it run for a looooooooooooooooooooong time. You should be seeing bubbles coming up at the radiator cap, and as long as your not revving the motor or anything, your coolant loss should be minimal. Just bring some premixed coolant with you because your coolant level will slowly drop as the air escapes.

I've never done this on a Supra cuz mine hasn't worked long enough for me to be able to, but it should be as I described. The greater the angle the better because of the height of the heater core versus the top of the radiator cap.

Chambers · 01-03-2008, 11:31 PM

Ok, thanks. That helps, I'll do that tomorrow when I replace the speedo cable.

suprakid91 · 01-04-2008, 03:40 AM

Quote:

Originally Posted by Chambers

Ok, thanks. That helps, I'll do that tomorrow when I replace the speedo cable.

i have to burp it too. thanks for the post. and how much did your speedo cable cost you. how long was it and did you also get a new housing for it cuz mine broke too and i cant get the old one out.

CyFi6 · 01-05-2008, 05:45 AM

even with the car on a slope i couldnt get the air out of the heater core completely, still got the waterfall noise. i found a better way to do it. get some a pair of vice grips and clamp off the line going to the heater control valve on the top. remove the heater core line comming from the bottom of the valve and quickly sumberge it in a bottle about half full of water or coolant mix, water should be fine. make sure the end of the hose is completely under water. Now, while holding the bottle, grab the upper radiator hose and squeeze it as hard as you can as fast as you can, its ok if water splashes out of the bottle, then hold it like that, wait for all the bubbles to go to the top. SLOWLY let go of the upper radiator hose and do it again and again until no more air puffs out when you squeeze. Now what i do is remove the radiator cap and remove the vise grip and reattatche the hose as quickly as possible, all those 3 things as fast as you can, i remove teh cap and release the vice grip in effort to let coolant flow through the heater valve and get the air out, then the displaced coolant can be filled into the radiator. THis worked perfect for me and no more waterfall/trickling water noise in the morning

01-03-2008, 08:17 PM	#1
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	When is The Best Time to "Burp" The Car? Hi all, I changed the rat fluid a few months ago and I got some air in the system giving me cold heat while driving. I have tried to bleed out the system a few times but I still have some air some where in the it. My question is when is the best time to "burp" the car, when the engine is cold or warm? By the way, I know a warm rat will spray fluid when opened. Also how much of an incline would be ideal? Thanks! __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

01-03-2008, 08:45 PM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	From what I've read and done on other cars is to jack it up to about 35-45 degree angle (if possible; hills help with this). Pop the radiator cap off, turn the car on and the heater on full blast, and let it run for a looooooooooooooooooooong time. You should be seeing bubbles coming up at the radiator cap, and as long as your not revving the motor or anything, your coolant loss should be minimal. Just bring some premixed coolant with you because your coolant level will slowly drop as the air escapes. I've never done this on a Supra cuz mine hasn't worked long enough for me to be able to, but it should be as I described. The greater the angle the better because of the height of the heater core versus the top of the radiator cap. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

01-03-2008, 11:31 PM	#3
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Ok, thanks. That helps, I'll do that tomorrow when I replace the speedo cable. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

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01-05-2008, 05:45 AM	#5
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	even with the car on a slope i couldnt get the air out of the heater core completely, still got the waterfall noise. i found a better way to do it. get some a pair of vice grips and clamp off the line going to the heater control valve on the top. remove the heater core line comming from the bottom of the valve and quickly sumberge it in a bottle about half full of water or coolant mix, water should be fine. make sure the end of the hose is completely under water. Now, while holding the bottle, grab the upper radiator hose and squeeze it as hard as you can as fast as you can, its ok if water splashes out of the bottle, then hold it like that, wait for all the bubbles to go to the top. SLOWLY let go of the upper radiator hose and do it again and again until no more air puffs out when you squeeze. Now what i do is remove the radiator cap and remove the vise grip and reattatche the hose as quickly as possible, all those 3 things as fast as you can, i remove teh cap and release the vice grip in effort to let coolant flow through the heater valve and get the air out, then the displaced coolant can be filled into the radiator. THis worked perfect for me and no more waterfall/trickling water noise in the morning