Question about 1987 Lincoln Mark VII

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Electrical problem my lincoln mark 7's heater core was messed up so i let my dads friend install a new one cause he was chraging a cheaper price than the mechanic we normally go to.....so when i get my car back i hook up the cd player and listen to it....and every time and type of bass hits the lights dim...no subs hooked up...just door speakers...i thought i had somethin hooked up wrong and i got a new cd player later anyway...so i hook the new one up and it just cuts on and off randomly when the car is off and when the car is on on.....also when the car is on and i hit the brake and sometimes when i change gears the console that has the time one it flashes on off on as well as the console with the outside temp and direction....sometimes the speedometer and rpm...dont' work...they randomly jump up...i have noticed that just about everytime i switch gears and hit the brake...stuff starts flashing....and the climate control just repeatedly flashes like 30secs after the car is started and the climate control is on...it has done this for about 3 days but sometimes i would hit the brake and the car would rev up like i hit the gas.....also i ran new constant and power wires str8 off the battery to the cd player and now it works fine...but i'm still havin all these other problems.....i have a new battery...high output alternator....and voltage regulator...i don't know what's wrong...it didn't do this before the heater core was fixed....what do you reccomend?

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  • Lincoln Master
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This is going to be a loose ground. Since the problem occured after a heater core replacement I would check the ones there. Pull the kick panels off of both sides and make sure the grounds are hooked up and tight. They will have bolt thru connectors on the end of the wires.Also look at the center brace area under the dash sometimes they have them there too.

Posted on Feb 03, 2009

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1 Answer

How to install a new heater ore for a 2002 saturn sl


It's a long 7-10 hour job.

Have to remove the dashboard

then remove hoses to heater core
then remove wires going to heater core circuit board
then remove heater core
replace it and put everything back together without messing anything under your dashboard.

Mechanics charge between $700 to $1000 to replace one.

If the core is not leaking (wet passenger side floor) you may want to try a reverse flush before touching anything, remove the 2 hoses in the engine compartment at the firewall leading to the heater core and with a garden hose flood the heater core connector until it the water is clear then do the other connector.

If that don't work and your not sure you can do the replacement correctly don't do it.

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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
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  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
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Hi there,

Well, you could purchase a Spectra heater core for your vehicle at a discounted rate of $30.51 and it can be ordered online at drivewire.com. Here are the specifics of the item:

SPECTRA HEATER CORE:
7.75 x 6 x 2 in. core size, 0.75 in. inlet size, 0.75 in. outlet size; 100 percent leak tested heater core with fully brazed aluminum design available for more than 95 percent of aftermarket demand; Designed for exact fit in the vehicle%X92s original equipment heater casing; Engineered to meet or exceed manufacturer's specifications with original equipment quality at a very competitive price; Carefully packaged for product quality and easy installation; With 1-year Spectra warranty.

Happy purchasing!!!

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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
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  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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1 Answer

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behind glove box!
Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core.
Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
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When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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Book time is 1.8 hrs. If he is charging for flushing the cooling system then 3 hrs is not too far off.

Warranty is usually void if the system isn't flushed.

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