If so, where located?

Thanks,
WWV

No, so you don't have to look for it. The heater inlet is found under the cowl (where the windshield wipers are) an has like a gutter guard over it. You can just see it here.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

No just a Screen.

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2006 Jeep Liberty CRD
1998 Beetle TDI Malone Tuning Stage 2
2001 Dodge Cummins
2005 Dodge Cummins
ASE, OBDII / VAG-CAN scaner / Service Manual

Can we clean them?

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2006 KJ CRD Ltd - Suncoast, GDE Eco, EGR Delete, After market T-Stat, Skid Row skids, V6 airbox, 2.5" Turbo back
2005 KJ CRD Sport-Suncoast, Transco, GDE Hot-GDE Trans, EGR Delete, Skid Row skids, V6 airbox, 2.5" Turbo back, After market S-Stat
1987 Suzuki LWB Samurai -diesel powered, custom 4 link coil suspension 38.5 SX Swampers

Clean what?

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Pull out any rotten vegetation sitting on top of the air intake, that is it.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

If anyone gets in there I'd sure like to see a picture of the "screen" and dam. Back in the day grill vents were pretty much wide open and you would be amazed at the amount of vegetation and other "stuff" that migrated over any dam and into the heater core. I took to taking the intake panel, between the windshield and hood off and gluing window screen to the under side to prevent that from happening on my purchased new vehicles. However on my purchased used 1993 Dodge Cummins it was so bad I had to carefully cut a porthole (finished it with a screw in marine inspection port) into the heater box to dig the crud out.

Unless that screen is fine mesh it might need some help.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

There is a screen directly behind the glove box on my gasser once you pop it out. Not sure if the crds have them or not. Mine was almost completely clogged with crud so I vacuumed it and wiped it with a rag. It's in front of the door that opens when you switch the air to circulate.

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2005 Renegade

Yes if you pop the glove box retaining arms so it will drop down and then look up in there with a light you can see a screen. It doesn't address my concern about outside stuff getting into the HVAC box but it does keep larger particles from getting in when the HVAC system is set on recirculate. Mine had a bit of dust bunny fuzz on the cabin side that wiped off with a damp rag. Just to confirm its function I fired the beast up and flipped the AC to recirculate and sure enough a door behind that screen flipped up to shut off the outside air intake.

I've made a note to look under the cowl grill when I get a chance to see how substantial that debris dam is and whether extra screen might be in order. Will post whenever I find out one way or another but it won't be soon. GDE turbo install higher on list.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs