Radiator sits at 212 on the highway going 70
- Thread starter Owl of Judgement
- Start date
That’s right where it’s supposed to be. Nothing to worry about
OP
I was wondering why it does that i have a mopar radiator that’s few months old. I don’t trust part store radiators.
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TJRick
TJ Enthusiast
Actually, Ford has been using a 195 degree thermostat in their small block engines since the 1960s - 20 years before computer-controlled fuel injected vehicles were the normal.
It has been proven that it is actually better for your engine - carbureted or fuel injection - to run it hotter than it is to run it cooler.
Cajun001
Member
Thanks for the information, I was about to ask the same question, anything above 65 MPH with AC on I am running just past the 210 indicator. during the winter I swapped out the water pump, flushed radiator system, and changed thermostat with 195 deg. and it was running just under 210 with no AC. At what temperature do I need to start worrying about over heating the 4.0 engine?
You should switch back to a stock temp thermostat as the colder t-stat can cause it to not run correctly unless you have a tune on the PCM that changes the temp the engine needs to achieve.
Not sure what you mean. The 195 is the proper stock thermostat for the 4.0.
Sorry never mind getting temps confused. My V-8 has a higher t-stat.
OP
Mine also does that with the AC not on but when I got cold air blasting and running at 70mph it’s slightly above 210 so I figured something is up but it did that for 2 hours when I’m on the interstate and it would go down to 210 when I hit stop and go traffic.
OP
That's perfectly normal, don't worry about it.
OP
This is where it sits at with the cold air on while I’m idling but when I get on the highway it goes to 212 but it never touches the 0 it’ll stay between the 1 and the 0 and it did that for 5 hours on the road going 70 the all my cooling system was replaced at 100k I now have 124k
OP
I used to have an XJ so I’m kinda new to this wrangler stuff lol
LONGJP2
TJ Expert