excessive coolant loss thru exaust
Asked by GuruHJYCF Aug 13, 2019 at 06:30 PM about the 2008 Volkswagen Passat 2.0T
Question type: Maintenance & Repair
rebuilt my 2.0t new head. valves. put the hoses that go on the drivers side (not sure what its called) assembly heater core and radiator hose 4 total and one brake booster hose.. I accidently hooked the heater hose where the brake booster hose should have went.. filled the engine with coolant hydro locked it.. figured out the problem. replaced the vacuum pump and blew out the lines with compressed air.. now the car drinks coolant and smokes like a mosquito truck.. compression is 180 in all cylinders and oil is not milky( changed after hydro locking)..puzzled.. maybe a bad intake gasket?? where's the coolant coming from??
6 Answers
lincolnscott49 answered 4 years ago
Sounds like you had a previous blown head gasket and over heating in the past. Replacing the new head gasket and re manufactured head is not all that should have been done prior to rebuilding the head . It may be a cracked head or block as this also occurs when an engine over heats. Prior to doing a head job an engine block and head that has over heated should be checked for damage or a crack. watch this video https://www.bing.com/videos/search?q=magnaflux+testing&&view=detail&mid=FFB3A362572DB32D1094FFB3A362572DB32D1094&&FORM=VRDGAR
compression is 180+ in all 4 cylinders no antifreeze in oil.. puts out lots of smoke when revved over 2000 rpm and drinks coolant you can see the level drop in the reservoir … don't think a bad head would have these results..
lincolnscott49 answered 4 years ago
Something was either done incorrectly related to the head ( cracked ) or head gasket or the block is cracked .Coolant is getting into the exhaust port. When you have filled the coolant bottle including allowing the system to purge. crank the car if coolant bubbles in the bottle when you rev the engine, the above applies and you failed in the repair of the blown head gasket. overlooked a cracked block or head.
ok just seems like a lot of coolant lost for a crack... could there still be some coolant inside the intake or vacuum lines when I flooded the vacuum pump? would that cause it to practically drink the coolant?
lincolnscott49 answered 4 years ago
No the fact that the coolant system works under pressure about 16lbs at around 185 degrees combined with the exhaust system leaking into the coolant system that is around 1500 degrees increases coolant temperature in the cooling system which also increases coolant pressure. Therefor a small crack is never a small crack when it comes to a block or head. Coolant is forced out
lincolnscott49 answered 4 years ago
You can go to a parts store and rent a block tester today's testers are different from years ago were It was a small clear syringe squeeze tube type of devise with colored plastic balls inside. when you drew coolant from the coolant system it would show you if you had exhaust in the system. Today they utilize a colored chemical that changes color if exhaust is present. These type of block testers can be rented from parts stores and returned for full refund. At the least you will know if exhaust is in your cooling system or not ,
