Replacing Radiator and Maintenance

ocarlo

Active member
Oct 30, 2017
31
0
NY, NJ
Gents,
Am having overheating issues primarily after running down the highway for more than 45minutes.
Went into the red once, DashCommand was showing 240 - coolant steamed but never bubbled over, and limped home later.
Shop changed T-stat and burped - still overheating after 40minutes.
Everything checks out - fan clutch and water pump fairly new, belt routed correctly, auxiliary fans ok.
No coolant loss or contamination, no exhaust white smoke, oil cap clean.
Peeked at rad - dirty in front of fan, and looks like the fins have turned green.
Will be ordering a Nissens and new brass plug- at $50 more than the Ebay ones but seems to have a better rep, and made in Denmark.

1 - Anything I should watch out for in removing / installing? Things likely to break? Washers/gaskets to replace?
I understand the Nissens will come with all washers and gaskets (hopefully).
Can I use CRC throttle body cleaner to clean out all connections?
Anything I can paint or spray on the new rad against winter rust, or not bother?

2 -Draining - seems to be a variety of techniques (lower rad hose, or suction from rad fill plug and coolant expansion tank),
or this: https://www.roverparts.com/resources/videos/coolant-hose-thermostat-replacement-discovery-1/
Lower of two bolts to the side of water pump, good for 85" drain without the mess???
Does this sound right -
A} Add Prestone Flush a day before. Drive with heater on to flush heater core.
B) Drain when cold - Remove t-stat - then flush with water hose and heater on - Drain
C }Remove old Rad - Replace -
D) Flush with Distilled water - Drain - new coolant in - bleed.
currently on pink/orange coolant - what's the latest consensus for D1?

3) Have new Stant Superstat 180 and OEM ECT sensor - I assume I need to do this with coolant drained?
4) Thinking of replacing the PCV valves, but scared of screwing up the oil separator....anyone done this?
Thanks in advance. Sorry for the neediness. Will be hiring a shade tree mechanic so I can do most of the work, and learn!
 

p m

Administrator
Staff member
Apr 19, 2004
15,633
864
58
La Jolla, CA
www.3rj.org
(1) Don't overtighten the threaded hose connections
(2) I usually put a plastic hose in the radiator fill plug hole, all the way to the bottom, seal it temporarily with a rubber glove, and blow into the cap hole on the expansion tank. Haven't leaked more than a few drops in several radiators now.
(3) using lower temperature thermostat makes for lower average running temperatures (safer on long trips), but will also result in larger temperature swings (does not help engine to live longer). If you replace thermostat and ECT without draining coolant, quite a bit will drain out of these orifices.
 

Toran

Well-known member
Feb 3, 2017
416
48
Ohio
I had the same issue last year.
After replacing nearly all things related to the cooling of the truck the issue was resolved with a new coolant reservoir and cap
 

ocarlo

Active member
Oct 30, 2017
31
0
NY, NJ
I had the same issue last year.
After replacing nearly all things related to the cooling of the truck the issue was resolved with a new coolant reservoir and cap
Thanks. Thing is, my expansion tank had leaked last year, and the gasket was replaced. No leaks, and a pressure test last week confirms this. So really the rad is the last item left. I got the car at 90k and can’t know if this is the stock rad. If so, it’s 23 yrs old, and a new one can only help.
 

ocarlo

Active member
Oct 30, 2017
31
0
NY, NJ
(1) Don't overtighten the threaded hose connections
(2) I usually put a plastic hose in the radiator fill plug hole, all the way to the bottom, seal it temporarily with a rubber glove, and blow into the cap hole on the expansion tank. Haven't leaked more than a few drops in several radiators now.
(3) using lower temperature thermostat makes for lower average running temperatures (safer on long trips), but will also result in larger temperature swings (does not help engine to live longer). If you replace thermostat and ECT without draining coolant, quite a bit will drain out of these orifices.
Interesting. This blowing into the expansion tank is to get rid of air bubbles?
 

WaltNYC

Well-known member
Mar 3, 2010
710
138
NYC
You'll want to replace the o-rings in the oil and trans cooler connections (4x)

part: ESR1594L