You can get limited access through the evaporator probe grommet. It is a big grommet and to get at it, you just remove the glove box, gently unseat the grommet and pull the probe out of the fins, taking note where it came out.
I actually replaced all the foam insulation around the evaporator using window AC foam strips that I got at home Depot, It is very tight but doable. Watch not to scrape your knuckles.
You wouldn't be able to get a conventional vacuum cleaner hose in there very well, but I took my shop vac and duct taped some 3/4" fexible heater hose to the vacuum cleaner hose to suck out crap on the blower side of the evaporator.
With the insulation job I did, I got the outlet temps to go from the mid 50's (inadequate for a large van) to mid 30's and it will freeze you out with the blower on high. Because of the volume of the van, it still takes a few minutes to cool down those in the back seats since my van doesn't have rear heat.
I actually replaced all the foam insulation around the evaporator using window AC foam strips that I got at home Depot, It is very tight but doable. Watch not to scrape your knuckles.
You wouldn't be able to get a conventional vacuum cleaner hose in there very well, but I took my shop vac and duct taped some 3/4" fexible heater hose to the vacuum cleaner hose to suck out crap on the blower side of the evaporator.
With the insulation job I did, I got the outlet temps to go from the mid 50's (inadequate for a large van) to mid 30's and it will freeze you out with the blower on high. Because of the volume of the van, it still takes a few minutes to cool down those in the back seats since my van doesn't have rear heat.