running hot

[lucky13rme]

I've never had this problem before, but so far this spring my car seems to be running hot ocassionally. like 220-225 degrees. It wasn't hot outside like 50-60 and i wasn't stuck sitting in traffic or anything. Any ideas?

[pdltodamtl]

maybe thermostat starting to not work? pull it, test it

[fschambe]

Start with the stat and also check out your water pump.

[fschambe]

Engine - Running Hot And/Or Loss of Coolant

Bulletin No.: 00-06-02-001

File In Section: 06 Engine/Propulsion System

Date: January, 2000

Subject:
Engine Running Hot, Overheating and/or Loss of Coolant (Polish Radiator Filler Neck and Replace Radiator Cap)

Models:
1999-2000 Passenger Cars and Trucks with Composite Radiator End Tank

Condition

Some customers may comment on one or more of the following conditions:

^ Engine running hot

^ Engine overheating, and/or

^ Loss of coolant/low coolant message


Cause

The radiator filler neck may have an imperfection in the sealing surface.

Correction

Important: DO NOT REPLACE THE RADIATOR.

Using a piece of 400 grit wet/dry sandpaper backed with a flat piece of wood, polish the filler neck sealing surface using a circular motion.

Replace the radiator pressure cap with a cap of the same part number as shown in the GM Service Parts Catalog.

[adorai]

take off your oil cap and see if there is a froth on the underside of it. If you chocolate milk, report back.

[lucky13rme]

nope, oil is fine.

[fschambe]

OK, simple check list, try in order, checking results after each. Flush radiator. Clean out any leaves. Make sure cooling fans work. Replace radiator cap with NEW one. Replace thermostat possibly with 180*. Perform TB coolant bypass. Check and/or replace water pump. Replace radiator and coolant lines.