I just tested the fault codes through the climate control testing way.


I got code e 151.. which I l ooked up and it says its the coolant circulation pump.. open or short circuit.

I always thought it was the blower regulator because of the little amount it blows through the front ( but not the back)

What is my next step to testing the coolant circulation pump?

Thanks in advance.

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1992 SEL 600..... 143,000 miles

Coincidence, I'm working on the same problem.
I also presumed a bad coolant circulation pump. I tested it after removing it from the car and all test were OK doK. After putting it back, I still had the same problem. Time for a new coolant circulation pump.
Same problem with the new pump, so I have to look somewhere else.
After opening the old pump, I noticed a lot of rust around the electrical motor.
Maybe that rust prevented to pump to turn, although the electrical circuit appeared to be OK.
I'm told that a defective pump could destroy the climate control module, creating all sorts of problems.
Anyone with a suggestion or two????

Yea I always thought it would of been the blower regulator since the rear ac/heater works good.

Wondering if the code I was given might read as a open or short circuited coolant pump but still be the blower regulator?

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1992 SEL 600..... 143,000 miles