Hi,

I have a 2001 Jeep Grand Cherokee and my heater will not work at all. It blows Air and good just won't get any heat. Also my Heated seats won't heat up. If anyone could help that would be great. Thanks

Two separate issues: Heated seat's, and heat from the central HVAC system:
Is the vehicle reaching operating temp as shown on the gauge? If equipped?
Any other signs of no heat? Drivability symptoms? Do the cooling system hoses become hot? Both upper and lower radiator hoses, heater hoses (both should have some heat flowing through them)?

Heated Seats: Check all fuses. Did the Heated Seat Switch have an indicator light to show the system was on? Does it light now?
The weak links here are system relays and the seat elements themselves (elements are tough to diag without a DVOM). Hands-on diag is critical to pin-point faults.

Had a 1999 same issue with heater - it was the blend door- problem is the enitre dash needs to be removed down to fire wall 16 hour job and very costly-- :) As far as the seat warmers I did find a recall on this -

Quote:

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Originally Posted by goomba

had a 1999 same issue with heater - it was the blend door- problem is the enitre dash needs to be removed down to fire wall 16 hour job and very costly-- :) As far as the seat warmers I did find a recall on this -

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If you paid more than two hours labor, you got ripped off.
I can't imagine any respectable shop would tell you 16 hours labor when flatrate is only 1.8 hrs standard for any of the blend door actuators.
And I've also got some very good resource for recalls and TSBs but I cannot find any such recall for seat heaters on this vehicle.
Please, site your source with a link so we can all benefit from this.

You have broken blend doors. There is a good DIY kit from www.heatertreater.net It allows you to replace the broken plastic blend doors with steel components, accessing the plenum by removing the glove box rather than the entire dash. The repair saves a lot of time and money, and should be seriously considered by anyone who believes they have a broken blend door.