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2001 Suzuki XL-7 Plus 4dr Manual 2WD

2001 Suzuki XL-7
Trim Info:
Two Wheel Drive, 4-Door, Sport Utility
18 mpg city / 20 mpg hwy
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September 6, 2011, 6:56 am

Billy A

Question: Why is my engine running hot?

I have a 2002 Suzuki XL-7 Limited...Recently I had smoke coming from my engine...I saw my coolant was empty...I added some coolant and a co-worker who works on cars looked over my engine and said it looks like a cracked head because of the build-up he saw on the radiator cap...Took it to a mechanic and he said my radiator was bad...Had it replaced along with the thermostat and an oxygen sensor...All this was done within the past month...Now my engine started running hot this morning...What could be causing that?

September 7, 2011, 9:32 pm

Elizabeth K

Check the coolant level again. Check that the mechanic bled the air out of the system when replacing the coolant. Have you been driving for a while (since the repair) without the engine overheating? What driving conditions were you in when the overheating started again? Idle? Cruise? Stop and go traffic? Does turning on the heater lower the engine temp?

Here is an article on how cooling systems work:

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September 22, 2011, 12:54 pm

Billy A

I had the radiator replaced at the beginning of August. the oxygen sensor was replaced the end of August, all by the same mechanic. It ran fine until 2 weeks ago when the engine started to run hot. I put some water in and it was fine until last week. The temp goes up and down constantly while driving in stop and go traffic.

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September 22, 2011, 9:41 pm

Elizabeth K

If you are getting low on coolant, you have a coolant leak, which will cause an overheating problem. But you need to make sure you are aware of the difference between the full hot and full cold lines on the overflow tank.

And have the engine checked for a blown head gasket--that would also cause low coolant and overheating issues.

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