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Hello, I have bought Honda CRV 1998 automatic. And have coolant problem. Mechanic put new radiator, new cap, pressure tested = changed hoses that were leaking. Pressure test again no visible leaks at all, holding pressure fine. Now I still lose 100 - 150 ml of coolant after 40 kilometers that I drive per day. When engine is cold next day morning I open radiator I see no coolant even after I squeeze that thick hose, but fits there only 100 or 150 ml of water /destiled of course/. If engine is hoter - 2 hours after driving and I open it I still can see little water after I squeeze that thick hose. Till morning it will be again no visible coolant even after squeezing that thick hose . /100 ml will be gone/.
Level of coolant in reservoir tank is still the same, dont moves. hoses are clear no blockage.
I dont have coolant in oil or oil in coolant,. when open cap on engine no signs for head gasket problem. No leak in cabin after heater is on, works fine. No water in exhaust, no white smoke. No noises like water pump problems.
There is still some rust in the system coming slowly after flushing because previous owner or his mechanic probably did not take good care of it /I see a little rust on radiator cap/. My mechanic said is still air in the system. Well they flushed it twice, no change.
Temperature while driving is stable all the time /in the middle, slightly behind/.
Couple of times happened that after 4 hours engine off I turned it on and temperature jumped immediately to the middle /its operational temperature/, after 200 meters dropped very little /2 milimeters/ and came back immediately and stayed there for rest of my short trip.
Also in the morning after I turn the engine on car is still in Park position, and the temerature gets to its operational temeprature in the middle after about 3 or 4 minutes, slowly continuosly, but I think it is too fast.
 

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Check the transmission fluid as that typically goes through the radiator (on automatics-unsure about manual or stick shift cars) to get warm or cooled depending on needs. At worse the engine suffered a really bad overheating episode that damaged the head gasket or warped the head, leading to coolant loss into the cylinders.
 

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This issue was there when you purchased the vehicle? That is why the extensive part change?
Is temp gage displaying correct by verified actual engine temp?
 

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Discussion Starter #4
Thanks for answer, mechanic topped up gear box oil when they changed the radiator. My mechanic says its not head gasket or cylinders some other says it is. I guess compression cylinder test and combustion gas test will have to do next.
 

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Discussion Starter #5
This issue was there when you purchased the vehicle? That is why the extensive part change?
Is temp gage displaying correct by verified actual engine temp?
This issue was there when you purchased the vehicle? That is why the extensive part change?
Is temp gage displaying correct by verified actual engine temp?
when I purchased the car, I saw coollant loss but after pressure test were visible leaks so mechanic changed hoses and radiator, but what I wrote before was still happening. about actual temperature i was just talking to one of my friend that what we see in car thermometer doesnt have to be actual engine temperature.
 

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Radiator Pressure(engine temp) goes higher as soon as you turn engine off. If you are loosing more antifreeze after the engine has warmed up and then turned off then there could be a pin hole size leak.
There is a uv dye you can add to the radiator. If you loose fluid at radiator but not the reservoir the radiator cap is bad.
I'm assuming you are using the recommended antifreeze coolant mix ratio.
If it's just water inside the radiator it is evaporating either pin hole size leak at a hose, bad radiator cap or even a bad head gasket.
Also check the weeping hole of the water pump. I've seen engines loose antifreeze little by little through the WP weeping hole and it will start just as you describe, before you know the water dripping will be visible either at the crankshaft pulley or bottom of engine block right underneath the alternators base bracket.
Gl
 
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