Rather than start at the worst case end of the equation, start with the easy stuff first .... is it using / loosing coolant ?
If it's gurgling in the heater matrix, you'll hear it from both sides.
Are you sure it's not the climate control fan up under the rhs of the dash. Roughly up above where the fuse box is above your right knee when you're in the drivers seat.
Are you a spanner man ... or do you take your car to a mechanic ? If you're a spanner man, invest in a Nanocom, buy a copy of Rave (the "shop" link at the top of every page).
If the problem doesn't exist when cruise is engaged, it's quite possibly the TPS, but the only way to confirm this is to check it out using diagnostic equipment (Nanocom).
Cheers
Kev..
Going ... going ... almost gone ... GONE !! ... 2004 D2a Td5 Auto "Classic Country" Vienna Green
2014 MUX LST with fruit
2015 Kimberley Kamper "Classic"
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