The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Engine oil cooler overheating, 88 Suburban

rickpilgrim · 08-29-2016, 10:17 AM

First- are your cooler fins clean and not obstructed with dirt/dust/debris of any kind? Secondly it is possible that the cooler internal passages are partially to completely plugged which would put the system into bypass mode where the oil just circulates around the filter housing and back to the engine.
Personally I would get a new cooler for a 3500 truck(slightly larger) installed.
Suburbans are heavy, your small block works hard and an oil temp of 300 or so would not surprise me as our dually with its 427 TB has 10 qts oil and a remote filter and on a hot day with 180 thermostats we see 220-230 oil temp when towing.
Make sure your fan clutch is good, clean radiator so you have ample air flow.

08-29-2016, 10:17 AM	#2
rickpilgrim Registered User Join Date: Apr 2011 Location: Wausau, WI Posts: 591	Re: Engine oil cooler overheating, 88 Suburban First- are your cooler fins clean and not obstructed with dirt/dust/debris of any kind? Secondly it is possible that the cooler internal passages are partially to completely plugged which would put the system into bypass mode where the oil just circulates around the filter housing and back to the engine. Personally I would get a new cooler for a 3500 truck(slightly larger) installed. Suburbans are heavy, your small block works hard and an oil temp of 300 or so would not surprise me as our dually with its 427 TB has 10 qts oil and a remote filter and on a hot day with 180 thermostats we see 220-230 oil temp when towing. Make sure your fan clutch is good, clean radiator so you have ample air flow.