Need help trouble shooting

Wfo · Sep 20, 2019

a few weeks ago I installed a full race radiator and transmission cooler. It’s been running hot so today I drained coolant and used the vacuum fill method, Still same temps. It’s 70deg out and truck is jumping up to 210+. When I feel the lower hose on the driver side it’s cool, just above the double inline T that has 2 hoses going to the side of the oil filter it’s hot as hell. The hose on the passenger side is also hot. The driver side rad end tank is also cool while the passenger side is Hot. Full race and I are stumped. Could it be the thermostat? All ports / nipples were clear before I did the install. Can anyone offer advice? It’s a pain in the ass to change this out to the oem rad.

FordTechOne · Sep 20, 2019

Wfo said:
a few weeks ago I installed a full race radiator and transmission cooler. It’s been running hot so today I drained coolant and used the vacuum fill method, Still same temps. It’s 70deg out and truck is jumping up to 210+. When I feel the lower hose on the driver side it’s cool, just above the double inline T that has 2 hoses going to the side of the oil filter it’s hot as hell. The hose on the passenger side is also hot. The driver side rad end tank is also cool while the passenger side is Hot. Full race and I are stumped. Could it be the thermostat? All ports / nipples were clear before I did the install. Can anyone offer advice? It’s a pain in the ass to change this out to the oem rad.

Just throwing this out there...the radiator fans connectors are plugged back in right?

Wfo · Sep 20, 2019

FordTechOne said:
Just throwing this out there...the radiator fans connectors are plugged back in right?

Yes, they are going on and off normally.

wheelman55 · Sep 20, 2019

Maybe there is an air bubble in the system?

Antho · Sep 20, 2019

Would be worth swapping the thermostat.

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Rappie · Sep 20, 2019

Could be air in the system. Try bleeding the system to release the air pocket.

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Blown00gt · Sep 20, 2019

I would guess air bubble take the cap off and get it up to temp. Could be T-stat you could always take it out and put it in hot water on the stove and see if it is functioning.

DreadPirateRaptor · Sep 21, 2019

Worth it to flush bro. Could be as simple as some packing material blockage. (Has happened to me)

nikhsub1 · Sep 21, 2019

Do you have the oem thermostat? It's a 195 degree unit IIRC so 210 is gonna happen.

jabroni619 · Sep 21, 2019

A new radiator alone isn't going to drop temps if you're using the stock thermostat. Think of it as a pressure regulator on an air compressor. If it's set to 40 PSI, it doesn't matter how large of an air tank you get, you're still going to get 40 PSI. You just have a lot more coolant now before heat soak sets in.

Need help trouble shooting

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