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70rs/ss · 08-04-2008, 02:14 PM

First, I'd verify the actual temp, as the old guage probably isn't accurate. If it is hot, then new pump (old pumps really aren't worth the risk a new not rebuilt pump is only about $30). What temp is the thermostat? A 210 thermostat will make the motor water heat to 210 before opening and recirculating, so a 180 or 190 is more appropriate for our vintage truck. Lastly the rad, once it is warm, touch the core and see if you have any cold spots, if so, some tubes are plugged. A rad shop can rod out the core but a new 4-row can be had for about $200 Radiators.com I think or ebay, either place is a great source for inexpensive 4-rows) and you'll never run hot again with a 4-row.

08-04-2008, 02:14 PM	#3
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: K10 Running hot First, I'd verify the actual temp, as the old guage probably isn't accurate. If it is hot, then new pump (old pumps really aren't worth the risk a new not rebuilt pump is only about $30). What temp is the thermostat? A 210 thermostat will make the motor water heat to 210 before opening and recirculating, so a 180 or 190 is more appropriate for our vintage truck. Lastly the rad, once it is warm, touch the core and see if you have any cold spots, if so, some tubes are plugged. A rad shop can rod out the core but a new 4-row can be had for about $200 Radiators.com I think or ebay, either place is a great source for inexpensive 4-rows) and you'll never run hot again with a 4-row.