Coolant boil over!

[CAnderson1034]

I recently replaced my 304 with an AMC 360 and now when I get done driving it on a hot day for more than 15 min. when I come to a stop and shut off the engine the coolant will boil over. Will a non-thermal fan clutch help or am I going to have to upgrade my radiator completely? Thanks

 

[SteelHeadz]

I had to upgrade to an aluminum 4core radiator and an electric fan controlled by an adjustable thermostat module.

 

[Saddle Tramp]

Did you try checking the radiator cap? If the spring is wearing out it will let the coolant go when stopped. Got an overflow bottle?

 

[CAnderson1034]

I don't have an overflow bottle. If I let the jeep cool Down for about 10 minutes after driving it there is no boiling over but if I just shut it down right away it will. Could that still be the cap, or is it more of an overheating problem?

 

[arthurrohan]

I had a similar problem, and got if fixed my replacing the radiator cap and the hose. The cap didn't fit properly, and the hose had cracks. Don't know if this'll help, this is my tuppence.

 

[Saddle Tramp]

I'd put a bottle back on as it is designed to catch the excess (hot & expanded) coolant when you shut the motor down.