Why is it still running hot?

Asked by Brandonthemaintanceg... Jul 01, 2020 at 11:02 PM about the 2005 Jeep Grand Cherokee Limited

Question type: Maintenance & Repair

I have a 2005 Jeep Grand Cherokee limited 4.7l.
Ran great for 4 months. Ran hot (over hot) and blew
two rockers. Just had a newer engine put in. It’s ran
hot every test drive since. Personally replaced the
water pump, radiator, upper and lower hoses, and
the thermostat. The belt is tight and not slipping.
The fan is mechanical and stays on constant and
blows plenty of air. The heater core does not leak
into the floor. I’m COMPLETELY stumped on this
one. Please any and all advice? I’ve put a lot of
money and labor in this thing and can’t drive 10
miles without running hot.

10 Answers

1,100

Have u taken an infrared thermometer and checked the actual engine temp. Did you use the same coolant temp sensor off the old engine? I have a 98 olds where the temp gauge reads 220⁰F but actual engine temp @ the temp sensor is 198⁰F - 200⁰F.

1,100

Also check the radiator cap.

1 people found this helpful.
1,100

Have u taken an infrared thermometer and checked the actual engine temp. Did you use the same coolant temp sensor off the old engine? I have a 98 olds where the temp gauge reads 220⁰ but actual engine temp @ the temp sensor is 198⁰ - 200⁰

1,100

Have u taken an infrared thermometer and checked the actual engine temp. Did you use the same coolant temp sensor off the old engine? I have a 98 olds where the temp gauge reads 220 but actual engine temp @ the temp sensor is 198 - 200

1,100

Check the actual temperature of the engine.

1 people found this helpful.

Radiator came with the cap. And how to check temperature other than gauge? The gauge reads hot. Typical runs from 195-220. The gauge gets to about 250 and I switch it off.

Cap came with the radiator. The gauge reads hot and is accurate. How to check temp other than gauge?

1,100

U need an infrared thermometer. Harbor freight or local parts store, and maybe even Walmart carries them. And did the use the same temp sensor from the old engine?

The old engine had a new one in it. This one I’m unsure. Doubtful because I didn’t do the engine swap. I’ll get a sensor and test the temp and get back.

1,100

Ok, if it still reads hot I'd check the catalytic converters and muffler.

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