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'Special Coolant Required'.....?

10K views 10 replies 7 participants last post by  Chilly03 
#1 ·
One of the possible options in my hunt trying to find out why my Jeep heat isn't working before the subzero freeze this weekend....... is low coolant.

Obviously the radiator, but there is also the fill canister which has printed in large letters 'SPECIAL COOLANT REQUIRED', but no clue as to what is this is.

I've of course looked on line and heard talk of HOAT, only available from the dealer (not an option on New Years) or Zerex, which is apparently no longer available commercially. And theres confusing talk about 'never mixing coolant colors'.

What is the special coolant people are using for Jeep Wranglers here, and is there anything that in particular won't gum up a heater core.... which may be the problem I have already even though I've tried flushing? Appreciate any advice. Not an expert, so asking....thanks!
 
#3 ·
Zerex G-05 is a HOAT antifreeze. I get it at NAPA.
 
#4 · (Edited)
Zerex G-05 HOAT is still available in better auto parts stores, I get mine from NAPA. But to top it off today, you can use distilled water like you can find in any grocery store's water aisle. I never recommend using plain tap water since that can contain a high content of dissolved mineral content which can eventually clog up a radiator.
 
#5 ·
I had already picked up some prediluted Prestone 50/50 "ALL makes ALL models add to ANY color"........ insofar as having heater core problems, should I hold out for Zerex G-05 HOAT, or just top off the radiator with what I've got and fill the reservoir? Just a last ditch effort to see if it helps with the heat. Its odd, but it seems like the core hoses really aren't getting hot though the radiator is new.

Why the "SPECIAL COOLANT REQUIRED" if not required?
 
#8 ·
see


Zerex G-05 HOAT is still available in better auto parts stores, I get mine from NAPA. But to top it off today, you can use distilled water like you can find in any grocery store's water aisle. I never recommend using plain tap water since that can contain a high content of dissolved mineral content which can eventually clog up a radiator.
That add to any color stuff is DEX COOL I would of topped it off with distilled water if there is sufficient coolant already present. Do it first thing in the morning and add the HOAT it's in your service manual
 
#10 ·
Jeff: You have a TJ, right? If so, they "special coolant" is phosphate free stuff. That being the case, top off with the prestone fiddy/fiddy and wait till you can do a full flush and then fill with a quality coolant.o

The type of coolant (since you just had an engine installed a little while ago, you likely have "green" stuff in there, will not cause your heat issues.
 
#11 ·
I came out yesterday to go to the store( in 18 degree weather) and noticed my check engine light on half way there, got home parked it and went out this morning and my coolant is super low, but has the green stuff. My TJ is an 03X should I use the Prestone 50/50 for now? My garage has my XJ in there a bit ripped apart, and flushing it on the street is not an option.
 
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