240sx coolant boil problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

damienknight · 06-12-2004, 02:40 PM

I have a 1990 240sx automatic. I have the stock KA24E engine in it. I'm going to convert it to manual, but first I need to figure out how to fix my damn problem. Here's the deal:

When I drive it around, the coolant will overflow in to the reservoir and start to boil. I've alread tried flushing the coolant system, and when I refilled it the radiator only took 4 quarts of fluid, instead of the specified 7 1/4 quarts. I tried running the engine with the cap off to see if there was air in the system, and the coolant started overflowing from the radiator after idling for less than a minute.

I'm just looking for advice as to what steps to take next, if anyone's had this problem that would be great. I'm afraid it might be the head gasket, but I want to try other things first, thanks.

sr240mike · 06-12-2004, 07:50 PM

Did you turn on the heater while doing refilling? Also, is your thermostat opening? Is there any coolant coming out of the weep hole on the water pump?

damienknight · 06-13-2004, 12:01 AM

yeah, i turned the heat all the way up. the thermostat is fine, it was just changed, and no coolant leaks.

element240 · 06-13-2004, 12:15 AM

make sure your radiator cap isn't faulty...

also, some of the coolant stays in the block which might contribute to why you only needed 4 qts ... i think there is a coolant drain plug on the block , or at least the fsm says so for the SR

06-12-2004, 02:40 PM	#1
damienknight Join Date: May 2004 Location: boston, ma Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	240sx coolant boil problem I have a 1990 240sx automatic. I have the stock KA24E engine in it. I'm going to convert it to manual, but first I need to figure out how to fix my damn problem. Here's the deal: When I drive it around, the coolant will overflow in to the reservoir and start to boil. I've alread tried flushing the coolant system, and when I refilled it the radiator only took 4 quarts of fluid, instead of the specified 7 1/4 quarts. I tried running the engine with the cap off to see if there was air in the system, and the coolant started overflowing from the radiator after idling for less than a minute. I'm just looking for advice as to what steps to take next, if anyone's had this problem that would be great. I'm afraid it might be the head gasket, but I want to try other things first, thanks.

06-12-2004, 07:50 PM	#2
sr240mike Zilvia FREAK! Join Date: Apr 2004 Location: California, Norcal biiaatch Posts: 1,185 Trader Rating: (0) Feedback Score: 0 reviews	Did you turn on the heater while doing refilling? Also, is your thermostat opening? Is there any coolant coming out of the weep hole on the water pump? __________________ TWO IN THE COOT, ONE IN THE POOT

06-13-2004, 12:01 AM	#3
damienknight Join Date: May 2004 Location: boston, ma Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	yeah, i turned the heat all the way up. the thermostat is fine, it was just changed, and no coolant leaks.

06-13-2004, 12:15 AM	#4
element240 Zilvia Addict Join Date: Jan 2004 Location: MI Age: 39 Posts: 735 Trader Rating: (0) Feedback Score: 0 reviews	make sure your radiator cap isn't faulty... also, some of the coolant stays in the block which might contribute to why you only needed 4 qts ... i think there is a coolant drain plug on the block , or at least the fsm says so for the SR