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1989 Mercury Marquis Evaporator

awfol on Thu March 24, 2011 10:00 PM User is offlineView users profile

Year: 1989
Make: Mercury
Model: Marquis
Engine Size: 5.0
Refrigerant Type: R134
Country of Origin: United States

First I would like to again say THANK YOU!!! I have been able to fix two A/C systems with the information I have learned from this forum.
One was a 1993 Taurus (black death) it was a total redo. Replaced everything except the evaporator. I was able to flush the evaporator and then put a ACkit in-line filter in and converted to R134. It has been running three-four years without any issues or leaks. Had to have the transmission rebuilt but the A/C is still going strong.

I'm getting ready to tackle my Mom and Dad's 1989 Mercury Marquis. It's a cream puff, 75,000 original miles, garage kept. I have
converted it to R134 already (couple years ago) and it cools pretty good, not as good as the taurus but good enough. The issue now is the evaporator, it has a leak and has to be replaced. The system leaked down alittle last year, I recharged and added UV dye last fall. I've identified dye in the drain tube so I have to assume this is where the leak is. Can't find dye anywhere else.

How do you go about removing the evaporator? I've read that you have to take the inner fender out to get at it and looking at it
that seems like it maybe be the way to go. Just looking for some advise from someone who mayhave replaced one of these before.


Edited: Thu March 24, 2011 at 10:08 PM by awfol

TRB on Fri March 25, 2011 6:03 PM User is offlineView users profile

Disconnect negative battery cable. Discharge A/C system using approved refrigerant recovery/recycling equipment. Disconnect lines at accumulator and at evaporator. Position hoses away from evaporator case and cap all openings.
Disconnect 2-wire plug from cycling clutch pressure switch on accumulator. See Fig. 9 . Drain coolant from radiator. Disconnect heater hoses from heater core and plug core openings.
Turn steering wheel to left to gain access to wheelwell splash panel support bracket. Remove screw and splash panel support bracket from back portion of wheelwell.
Remove 6 screws from right side hood seal bracket assembly. Remove copper hood ground clip from underneath hood seal. Remove hood seal assembly from right side of vehicle.
Set aside all vacuum hoses and wiring that pass over top of evaporator case assembly. Disconnect blower motor wiring and 2 large wiring harnesses crossing evaporator assembly and position out of way.
Fold back carpet on passenger's side and remove bottom left screw of 2 screws supporting inlet recirculating air assembly. Disconnect in-car temperature sensor air tube from evaporator air tube port.
From under hood, remove nuts from evaporator assembly mounting studs and 2 screws from blower motor assembly. Pull evaporator assembly off 2 bottom studs, then off top stud. Maneuver case up and over wheelwell splash panel. To install, reverse removal procedure. Recharge A/C system. Refill and bleed cooling system.


When considering your next auto A/C purchase, please consider the site that supports you:

awfol on Thu April 07, 2011 11:23 PM User is offlineView users profile

Thank YOU!!!

Replacing this evaporator was a PITA but it's done and working great.

Thanks again.


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