alaskaone

1989 Cherokee 4.0 liter with closed cooling system. Reservation tank never seals so when pressure drops - heating drops. Any suggestions? Convert to open system?

99 Purple XJ

Is the bottle not building pressure and yes i would convert it to open cooling system

99 Purple XJ

I would convert to open cooling system

Firestorm500

No, replace the tank and cap.

austinjoe13

Sealed systems are just fine as long as you know how to deal with them. Make sure all of your hose clamps are nice and tight too before you go and buy a new bottle.

cruiser54

Try this cap. It seals better than the chinese crap ones. It's from a Volvo. Napa 703-1396.

freegdr

up grade to open system if radiator is old and seen some years if still in good shape use volvo cap ..

alaskaone

Thank you. I will try a new tank and cap. I replaced all hoses, heater core and recently the radiator. I need heat with outside temps at -40. Any suggestions on replacing radiator with an open system, please advise. I had one but not enough space for filler because of air filter.

fishtaconc

You can convert the closed system to open without replacing your radiator by using the fill cap from a 4.7 durango or dakota, cutting it into your upper hose, and replace your bottle with an MJ overflow tank or any that fit. Then cap off or eliminate the T'ed lines in the heater core.

freegdr

theres several ways to do it just depend on you after i bought my 3 tank and cap after 15 years i upgraded the whole thing never a issuie sincehttps://www.cherokeeforum.com/f2/ren...d-shift-63044/