1998 venture overheating - 1998 Chevrolet Venture Cargo

Have the cylinder pressure checked.
For the overheating, check the fan and the fluid level in the radiator.

Hello, brandon1127 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2001 Chevrolet Venture, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 2001 Chevrolet Venture

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Thanks for the vote, and good luck!

Hello heatheru26 and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1997 Chevrolet Venture, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link to:
How to diagnose your overheating Chevrolet Venture engine

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Thanks for the vote, and good luck!

please give me more info, check radiator fluid, oil level

Yes it could be thermostat,,,make sure the cooling fan is turning on first,,if it is turning on ,i would go with the thermostat as my first try,but if the fan is not comming on you must fix that first

battery is dead or too much corrosion on the terminals.

check the throttle position sensor and also check for air intake leaks at the throttle body

It sounds like the switch went out. I have seen a lot of GM products have this same problem.

if you are not sure if it is the fan motor you can disconnect the plug to the fan and run a jumper wire with a positive and ground from the battery to the fan plug and it it comes on than the motor is good. and you have a bad wire or sensor. and one easy fix for that would be to get a toggle switch put it in the cab and run wires to a power sorce and then to the fan wires. i have done it once so you would have to keep an eye on the temp and turn the fan on manually. that would be a cheap and temporarily fix

it may be the harmonic balancer