2010 with 3.7 overheating at idle

Qwas37 · **Joined:** Sat Oct 26, 2013 11:54 am **Posts:** 2

Hello all,
My 2010 3.7 overheats at idle. Reads halfway at highway speeds but after 7 minutes idling its up around 3/4. I had error codes that read misfire 3 and misfire cyl 4. Replaced all spark plugs with iridium, wires, coils and fuel injectors for those particular cylinders thinking it could be firing or timing related. Whether I turn the heat on, or AC. it makes no difference.
What's you experience??? Thermostat next then the radiator? Not a pleasant idea
Thanks in advance...

tjkj2002 · **Posted:** Sat Nov 16, 2013 8:49 am

1st put copper core plugs back in,iridium plugs are bad for your engine.

Overheating at idle but not at highway speeds means a coolant flow/airflow issue like a bad waterpump,junk blocking the radiator,or a bad cooling fan.Common to get crap built up between the AC condenser and the radiator if you venture offroad in mud and such.

Texasrugby911 · **Joined:** Thu Feb 04, 2010 3:18 pm **Posts:** 196

This happened to me last year and ended up being auxiliary radiator fan died. When I was driving highway speeds, the 70mph+ winds swept the heat off the radiator, but when stopped, the heat just built up. Not sure if this is your issue though, because when I turned my heat on full blast, the engine overheating slowly went back to normal.

Gageraid · **Posted:** Sun Nov 17, 2013 11:59 am

Texasrugby911 wrote:

This happened to me last year and ended up being auxiliary radiator fan died. When I was driving highway speeds, the 70mph+ winds swept the heat off the radiator, but when stopped, the heat just built up. Not sure if this is your issue though, because when I turned my heat on full blast, the engine overheating slowly went back to normal.

This could be some good info for the OP to check out.

2010 with 3.7 overheating at idle

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