1991 Montero Overdrive probs

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Jun 8, 2009 | 11:30 PM

raff1ut

Thread Starter

Junior Member

Joined: Feb 2007

Posts: 10

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1991 Montero Overdrive probs

Overall performance is fine other than it doesn't want to shift into overdrive. Which is okay for granny cruising around town but not very polite for highway usage. Any ideas or suggestions?

Jun 10, 2009 | 04:27 PM

Manybrews

Senior Member

Joined: May 2003

Posts: 1,187

From: United States

probably the coolant grounding switch.

the car is not going to shift into overdrive until the engine is at operating temp. Assuming it is (is it?), the terminal that gounds the relay is probably corroded or failing.

Jun 17, 2009 | 09:30 PM

jgbrules

Senior Member

Joined: Feb 2008

Posts: 346

From: houma, louisianna

seen a few coolant temp sensors for the a/c system fail and cause that same problem. been many years ago, those vehicle dont come back to the dealership anymore unless its a last resort!!