its tricky but can be done. disconnect the lines on the engine side of the firewall.drain all the coolant...remove the lower trims on both sides of centre console and peel carpet back...some torx screws await you so get them out carefully...its a tight fit but the core can be pulled out the passenger side...have lots of rags or towels ready tho for the exra coolant that comes out of the lines....
possibly check the connection plug to the pump, or then the pump itself..your battery voltage could also be low. these cars draw a lot of power when starting...they should have a battery rating of at least 600 cca...let me know how you go with it
Hi i just started here....i have a 96 model 850 R manual that i modified....hopefully ill work out how to put pix of my current car on here soon. Im from Queensland in Australia