1993 Suburban overheating

PARKERSCAR

MEMBER
1993 CHEVROLET SUBURBAN

I have a 1993 Chevy Suburban with a 350 and it has 210,000 milesI on it. I have replaced the thermostat, water pump, both the switch and sensor, radiator with radiator cap and a new clutch fan. It overheats only at idle or in stop and go traffic and peaks out at 240-250 degrees. But once I get moving it cools down to normal temp at 190-200 degrees. What is the normal operating temp for the Suburbans and what am I missing. What could it be. I don't know what else to fix on this truck?

Saturday, August 4th, 2007 AT 10:13 PM

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Remove the Stat don't worry about what the PCM is thinkiing/doing and road test it- Try bleeding it again

Do you actually hear boiling at radiator/reservoir.

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Monday, August 6th, 2007 AT 2:35 AM

PARKERSCAR

MEMBER
2 POSTS

Remove the Stat don't worry about what the PCM is thinkiing/doing and road test it- Try bleeding it again

Do you actually hear boiling at radiator/reservoir.[/Quote:835cb61306]

If it sits at idle to long then yes it gets to its boiling point, and what do you mean by bleeding (getting all the air out)?

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Tuesday, August 7th, 2007 AT 5:40 PM