Overheating problem

Hi,

The idea that it doesn't overheat when sitting, I don't think this is a fan issue. When there are problems with the fan, it will overheat sitting still because there is no air flow through the radiator. Since it happens when you are driving, that is different because when moving, air flow exists.

I want you to try something for me. When the engine is cold, remove the radiator cap (on the bottle) and start the engine. Check to see if the coolant in the reservoir raises, comes out, or develops air bubbles.

Based on what is happening, I have a feeling there may be a head gasket issue. Here is a link that shows how to check, but try what I suggested first:

https://www.2carpros.com/articles/head-gasket-blown-test

As far as the cooling fan relay, here is the location info that I have.

RELAY LOCATIONS

Relay location on the thirteen position auxiliary relay panel, above relay panel:
Thirteen Fold/Position Auxiliary Relay Panel

See pic 1

1 - Coolant Fan Control (FC) Relay (214) (a)

Also, if you haven't already, you may want to flush the radiator to make sure nothing is causing a restriction.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

As far as a temp sensor, the only one is on the engine (rear of head).

See pic 2

Here is a link that explains how to test a relay. I don't know if you need it, but thought I would add it.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

One last thought. Since the fan isn't turning on, try running power direct to the motor (after disconnecting it from the vehicle) to see if it runs.

Let me know what you find.

Joe