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?

 

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

 

I would convert to open cooling system

 

No, replace the tank and cap.

 

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.

 

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

 

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

 

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.

 

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.

 

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/