Question about 2002 Chevrolet Monte Carlo

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Water leaking into 2002 monte carlo floor. where are the drain holes in the rocker panel?

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There are none. you either have a bad heater core or your air conditioner drain hose is clogged. It should be draining above the shock on the passenger front side.

If it is just water start with the AC, if it has coolant in it then its the heater core.

Posted on Aug 03, 2010

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Look at the bottom of your door panel and wiggle the seal to unclog the drain. I waited long enough my door started to fill up with water before I found the problem. once the door panel fills up (via the outside seal against the window) it drains over the lip and runs down into the floorboard......Thats my solution.

Posted on Aug 05, 2010

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2002 chevy monte carlo (48000 miles) I had water in my floorboard when it rained (front passenger side) . I changed the Cabin Air Filter because it clogged. Have to take gasket from bottom of windshield to get to it . I have replaced it twice in last 3 years and have had no problems since.Dealer wanted $79 to fix it, so i investigated it myself and it cost around $18 for the cabin air filter and have had no water inside car since.

Posted on Mar 25, 2011

Is the water coming from the sun roof,because to drain hose is off and water getting onto the front carpet?
Is the A/C drain clogged and water coming from the blower and duct work housing under the dash?

Drain holes are in doors,not rocker panels.

Posted on Aug 03, 2010

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Water in passenger floor board

It could also be coming from the blower motor (if you have a cabin filter). I have a 2000 Monte Carlo SS with a Cabin Filter and was replaced by someone who obviously who did not know what they were doing, I placed the seal where it needed to go, added silicon to the seal to hold it in place and built the seal up so it forms a nice seal when the plastic piece under the window is placed back on. So far no leaks!

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Whats involved in changing a heater core in my 2002 monte ?

Hello! Remove the fuel injection appearance cover (if it has one)

Drain cooling system

Disconnect heater hoses

Rmv. right/left instrument panel closeouts

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Rmv. rear floor air outlet duct from floor re-enforcement

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Rmv. the outlet cover screws and heat stakes using a small chisel

Rmv. the outlet cover from the HVAC assembly

Rmv. heater core cover screws and heat stakes using a small chisel

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Rmv. heater core from HVAC assembly

Guru...saailer....Installation to follow

I’m happy to help further over the phone at

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