98 Overheating and out of ideas
’98, 3.0, manual transmission, 2WD, 138,000 miles with overheating problem. Radiator, radiator cap, and water pump replaced. Hoses appear clear and pressure test holds. No white smoke in exhaust. No evidence of combustion gases in coolant or coolant in oil. Water vanes, body or journals (depending on what you want to call them) in engine block appeared to be clear when water pump removed. Heater core has water transfer evidence by heat being exchanged. Valve in heater line working and appears normal. All other smaller lines checked and OK.
Can run at idle for > 1 hour with AC on and not overheat. When truck is driven down the road the reservoir over fills/pressurizes and blows coolant out the top. If left overnight the coolant returns to radiator. Recent replacement of AC compressor also. Suspect overheating contributed to death of the AC compressor. AC blows cold and heat blows hot (if water is available). One side note is that previous owner used stop leak to the point that lower portion of radiator was clogged up. Never presented an issue until now so may not be part of the problem. Could the fan clutch contribute to this issue? Running out of ideas. Any suggestions welcome. Thanks in advance.
97 F350 7.3 TD
Last edited by ToddRD; 08-20-2010 at 06:21 AM.